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Walkthrough: Creating and Running a Database Unit Test

  • Статья

In this walkthrough, you create a database unit test that verifies the behavior of several stored procedures. You create database unit tests to help identify code defects that might cause incorrect application behavior. You can run database unit tests and application tests as part of an automated suite of tests.

In this walkthrough, you perform the following tasks:

  • Create a script that contains a database schema

  • Create a database project and import that schema

  • Deploy the database project to an isolated development environment

  • Create database unit tests

  • Define test logic

  • Run database unit tests

  • Add a negative unit test

After one of the unit tests detects an error in a stored procedure, you correct that error and re-run your test.

Prerequisites

To complete this walkthrough, you must be able to connect to a database server on which you have permissions to create and deploy a database. For more information, see Required Permissions for Database Features of Visual Studio.

Create a Script that Contains a Database Schema

To create a script from which you can import a schema

  1. On the File menu, point to New, and then click File.

    The New File dialog box appears.

  2. In the Categories list, click General if it is not already highlighted.

  3. In the Templates list, click Sql File, and then click Open.

    The Transact-SQL editor opens.

  4. Copy the following Transact-SQL code, and paste it into the Transact-SQL editor.

    PRINT N'Creating Sales...';
GO
CREATE SCHEMA [Sales]
    AUTHORIZATION [dbo];
GO
PRINT N'Creating Sales.Customer...';
GO
CREATE TABLE [Sales].[Customer] (
    [CustomerID]   INT           IDENTITY (1, 1) NOT NULL,
    [CustomerName] NVARCHAR (40) NOT NULL,
    [YTDOrders]    INT           NOT NULL,
    [YTDSales]     INT           NOT NULL
);
GO
PRINT N'Creating Sales.Orders...';
GO
CREATE TABLE [Sales].[Orders] (
    [CustomerID] INT      NOT NULL,
    [OrderID]    INT      IDENTITY (1, 1) NOT NULL,
    [OrderDate]  DATETIME NOT NULL,
    [FilledDate] DATETIME NULL,
    [Status]     CHAR (1) NOT NULL,
    [Amount]     INT      NOT NULL
);
GO
PRINT N'Creating Sales.Def_Customer_YTDOrders...';
GO
ALTER TABLE [Sales].[Customer]
    ADD CONSTRAINT [Def_Customer_YTDOrders] DEFAULT 0 FOR [YTDOrders];
GO
PRINT N'Creating Sales.Def_Customer_YTDSales...';
GO
ALTER TABLE [Sales].[Customer]
    ADD CONSTRAINT [Def_Customer_YTDSales] DEFAULT 0 FOR [YTDSales];
GO
PRINT N'Creating Sales.Def_Orders_OrderDate...';
GO
ALTER TABLE [Sales].[Orders]
    ADD CONSTRAINT [Def_Orders_OrderDate] DEFAULT GetDate() FOR [OrderDate];
GO
PRINT N'Creating Sales.Def_Orders_Status...';
GO
ALTER TABLE [Sales].[Orders]
    ADD CONSTRAINT [Def_Orders_Status] DEFAULT 'O' FOR [Status];
GO
PRINT N'Creating Sales.PK_Customer_CustID...';
GO
ALTER TABLE [Sales].[Customer]
    ADD CONSTRAINT [PK_Customer_CustID] PRIMARY KEY CLUSTERED ([CustomerID] ASC) WITH (ALLOW_PAGE_LOCKS = ON, ALLOW_ROW_LOCKS = ON, PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF, STATISTICS_NORECOMPUTE = OFF);
GO
PRINT N'Creating Sales.PK_Orders_OrderID...';
GO
ALTER TABLE [Sales].[Orders]
    ADD CONSTRAINT [PK_Orders_OrderID] PRIMARY KEY CLUSTERED ([OrderID] ASC) WITH (ALLOW_PAGE_LOCKS = ON, ALLOW_ROW_LOCKS = ON, PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF, STATISTICS_NORECOMPUTE = OFF);
GO
PRINT N'Creating Sales.FK_Orders_Customer_CustID...';
GO
ALTER TABLE [Sales].[Orders]
    ADD CONSTRAINT [FK_Orders_Customer_CustID] FOREIGN KEY ([CustomerID]) REFERENCES [Sales].[Customer] ([CustomerID]) ON DELETE NO ACTION ON UPDATE NO ACTION;
GO
PRINT N'Creating Sales.CK_Orders_FilledDate...';
GO
ALTER TABLE [Sales].[Orders]
    ADD CONSTRAINT [CK_Orders_FilledDate] CHECK ((FilledDate >= OrderDate) AND (FilledDate < '01/01/2020'));
GO
PRINT N'Creating Sales.CK_Orders_OrderDate...';
GO
ALTER TABLE [Sales].[Orders]
    ADD CONSTRAINT [CK_Orders_OrderDate] CHECK ((OrderDate > '01/01/2005') and (OrderDate < '01/01/2020'));
GO
PRINT N'Creating Sales.uspCancelOrder...';
GO
CREATE PROCEDURE [Sales].[uspCancelOrder]
@OrderID INT
AS
BEGIN
DECLARE @Delta INT, @CustomerID INT
BEGIN TRANSACTION
    SELECT @Delta = [Amount], @CustomerID = [CustomerID]
     FROM [Sales].[Orders] WHERE [OrderID] = @OrderID;

UPDATE [Sales].[Orders]
   SET [Status] = 'X'
WHERE [OrderID] = @OrderID;

UPDATE [Sales].[Customer]
   SET
   YTDOrders = YTDOrders - @Delta
    WHERE [CustomerID] = @CustomerID
COMMIT TRANSACTION
END
GO
PRINT N'Creating Sales.uspFillOrder...';
GO
CREATE PROCEDURE [Sales].[uspFillOrder]
@OrderID INT, @FilledDate DATETIME
AS
BEGIN
DECLARE @Delta INT, @CustomerID INT
BEGIN TRANSACTION
    SELECT @Delta = [Amount], @CustomerID = [CustomerID]
     FROM [Sales].[Orders] WHERE [OrderID] = @OrderID;

UPDATE [Sales].[Orders]
   SET [Status] = 'F',
       [FilledDate] = @FilledDate
WHERE [OrderID] = @OrderID;

UPDATE [Sales].[Customer]
   SET
   YTDSales = YTDSales - @Delta
    WHERE [CustomerID] = @CustomerID
COMMIT TRANSACTION
END
GO
PRINT N'Creating Sales.uspNewCustomer...';
GO
CREATE PROCEDURE [Sales].[uspNewCustomer]
@CustomerName NVARCHAR (40)
AS
BEGIN
INSERT INTO [Sales].[Customer] (CustomerName) VALUES (@CustomerName);
SELECT SCOPE_IDENTITY()
END
GO
PRINT N'Creating Sales.uspPlaceNewOrder...';
GO
CREATE PROCEDURE [Sales].[uspPlaceNewOrder]
@CustomerID INT, @Amount INT, @OrderDate DATETIME, @Status CHAR (1)='O'
AS
BEGIN
DECLARE @RC INT
BEGIN TRANSACTION
INSERT INTO [Sales].[Orders] (CustomerID, OrderDate, FilledDate, Status, Amount) 
     VALUES (@CustomerID, @OrderDate, NULL, @Status, @Amount)
SELECT @RC = SCOPE_IDENTITY();
UPDATE [Sales].[Customer]
   SET
   YTDOrders = YTDOrders + @Amount
    WHERE [CustomerID] = @CustomerID
COMMIT TRANSACTION
RETURN @RC
END
GO
CREATE PROCEDURE [Sales].[uspShowOrderDetails]
@CustomerID INT=0
AS
BEGIN
SELECT [C].[CustomerName], CONVERT(date, [O].[OrderDate]), CONVERT(date, [O].[FilledDate]), [O].[Status], [O].[Amount]
  FROM [Sales].[Customer] AS C
  INNER JOIN [Sales].[Orders] AS O
     ON [O].[CustomerID] = [C].[CustomerID]
  WHERE [C].[CustomerID] = @CustomerID
END
GO

  5. On the File menu, click Save SqlQuery_1.sql As.

    The Save File As dialog box appears.

  6. In Object name, type SampleImportScript.sql.

    You can save the file to any location on your computer. Make note of the location because you must use this script in the next procedure.

  7. Click Save.

  8. On the File menu, click Close Solution.

    Next you create a database project and import the schema from the script that you have created.

Create a Database Project and Import a Schema

To create a database project

  1. On the File menu, point to New, and click Project.

    The New Project dialog box appears.

  2. Under Installed Templates, expand the Database node, and then click SQL Server.

    Note

    If you are using Visual Studio Professional, instead you look under Installed Templates, expand the Database node, expand the SQL Server node, and then click Advanced.

  3. In the list of templates, click SQL Server 2008 Database Project.

    Note

    If you plan to deploy your database to a different database version, instead choose the template that corresponds to your target server.

  4. In Name, type SimpleUnitTestDB.

  5. Select the Create directory for solution check box if it is not already selected.

  6. Clear the Add to Source Control check box if it is not already cleared, and click OK.

    The database project is created and appears in Solution Explorer. Next you import the database schema from a script.

To import a database schema from a script

  1. On the Project menu, click Import Script.

  2. Click Next after you read the Welcome page.

  3. Click Browse, and indicate the path where you saved the SampleImportScript.sql file.

  4. Double-click the SampleImportScript.sql file, and click Finish.

    The script is imported, and the objects that are defined in that script are added to your database project.

  5. Review the summary, and then click Finish to complete the operation.

    Note

    The Sales.uspFillOrder procedure contains an intentional coding error that you will discover and correct later in this procedure.

To examine the resulting project

  1. In Solution Explorer, expand the Schema Objects child node.

  2. Explore the subnodes under the Schema Objects node in the hierarchy.

    Solution Explorer contains the files that define the database objects.

  3. From the View menu, click Database Schema View.

  4. In Schema View, expand the SimpleUnitTestDB node.

  5. Explore the subnodes under the SimpleUnitTestDB node in the hierarchy.

    Schema View contains the objects that are defined in the files that appear in Solution Explorer.

Deploying to an Isolated Development Environment

Next you deploy the project to create a database that has the imported schema but no data. You create this database in an isolated development environment (or sandbox) so that you can develop and test the database with no interference from other efforts.

To configure and build the database project

  1. In Solution Explorer, click the database project SimpleUnitTestDB.

  2. On the Project menu, click SimpleUnitTestDB Properties.

    The properties dialog box for the project appears.

  3. Click the Deploy tab.

  4. In the Configure deployment settings for list, click My isolated development environment. By configuring settings for your isolated development environment, you can use different deployment settings than those that will be used in your other environments, such as the staging or production server.

  5. In the Deploy Action list, click Create a deployment script (.sql) and deploy to database.

  6. In Target Database Settings, click Edit.

    The Connection Properties dialog box appears.

  7. Set the connection properties for the database that you want to create, and then click OK.

    In the Target Connection box, the correct connection string appears.

    Warning

    You should create the database on a test server, a development server, or on your local computer. You should not specify your production server.

  8. In Target database name, type SimpleUnitTestDB.

  9. Next to Deployment configuration file, click Edit.

  10. Clear the Block incremental deployment if data loss might occur check box.

    Note

    For this walkthrough, you will test the stored procedures against an empty database that you deploy as part of the database unit test. You do not have to preserve any existing data because you will test the stored procedures in your isolated development environment.

  11. On the File menu, click Save All.

  12. On the Build menu, click Build Solution.

    The properties that you have just set determine how the deployment script is built. The status of the build appears in the Output window, and Build: 1 succeeded or up-to-date should appear as the last line.

    Note

    If the Output window does not appear, open the View menu and click Output.

To deploy the database project

  1. In Solution Explorer, click the SimpleUnitTestDB database project.

  2. On the Build menu, click Deploy SimpleUnitTestDB.

    Warning

    You should run this deployment against a test server, a development server, or your local computer. You should not specify your production server.

    The database project is deployed to a new database. The status of the deployment appears in the Output window, and Deploy: 1 succeeded should appear as the last line. You might define a data generation plan to create test data in your database. For this walkthrough, you are testing a very simple database for which you do not need to generate data.

Create Database Unit Tests

To create a database unit test for the stored procedures

  1. On the View menu, click Database Schema View.

  2. In Schema View, expand the Schemas node, expand the Sales node, expand the Programmability node, and expand the Stored Procedures node.

  3. Right-click the uspNewCustomer stored procedure, and click Create Unit Tests.

    The Create Unit Tests dialog box appears.

  4. Select the check boxes for all five stored procedures: Sales.uspCancelOrder, Sales.uspFillOrder, Sales.uspNewCustomer, Sales.uspPlaceNewOrder, and Sales.uspShowOrderDetails.

  5. In Project, click Create a new Visual C# test project.

  6. Accept the default names for the project name and class name, and click OK.

    The Project 'TestProject1' Configuration dialog box appears.

  7. In Execute unit tests using the following data connection, specify a connection to the database that you deployed earlier in this walkthrough.

    Note

    If you must test views or stored procedures that have restricted permissions, you would typically specify that connection in this step. You would then specify the secondary connection, with broader permissions, to validate the test. If you have a secondary connection, you should add that user to the database project, and create a login for that user in the pre-deployment script.

  8. In Deployment, select the Automatically deploy the database project before unit tests are run check box.

  9. In Database project, click SimpleUnitTestDB.dbproj.

  10. In Deployment configuration, click Debug.

    You might also generate test data as part of your database unit tests. For this walkthrough, you will skip that step because the tests will create their own data.

  11. Click OK.

    The test project builds and the Database Unit Test Designer appears. Next, you will update test logic in the Transact-SQL script of the unit tests.

Define Test Logic

This very simple database has two tables, Customer and Order. You update the database by using the following stored procedures:

  • uspNewCustomer - This stored procedure adds a record to the Customer table, which sets the customer's YTDOrders and YTDSales columns to zero.

  • uspPlaceNewOrder - This stored procedure adds a record to the Orders table for the specified customer and updates the YTDOrders value on the corresponding record in the Customer table.

  • uspFillOrder - This stored procedure updates a record in the Orders table by changing the status from 'O' to 'F' and increments the YTDSales amount on the corresponding record in the Customer table.

  • uspCancelOrder - This stored procedure updates a record in the Orders table by changing the status from 'O' to 'X' and decrements the YTDOrders amount on the corresponding record in the Customer table.

  • uspShowOrderDetails - This stored procedure joins the Orders table with the Custom table and shows the records for a specific customer.

Note

This example illustrates how to create a simple database unit test. In a real-world database, you could sum the total amounts of all orders with a status of 'O' or 'F' for a particular customer. The procedures in this walkthrough also contain no error handling. For example, they do not prevent you from calling uspFillOrder for an order that has already been filled.

The tests assume that the database starts in a clean state. You will create tests that verify the following conditions:

  • uspNewCustomer - Verify that the Customer table contains one row after you run the stored procedure.

  • uspPlaceNewOrder - For the customer who has a CustomerID of 1, place an order for $100. Verify that the YTDOrders amount for that customer is 100 and that the YTDSales amount is zero.

  • uspFillOrder - For the customer who has a CustomerID of 1, place an order for $50. Fill that order. Verify that YTDOrders and YTDSales amounts are both 50.

  • uspShowOrderDetails - For the customer who has a CustomerID of 1, place orders for $100, $50, and $5. Verify that uspShowOrderDetails returns the right number of columns and that the result set has the expected checksum.

Note

For a complete set of database unit tests, you would typically verify that the other columns were set correctly. To keep this walkthrough at a manageable size, it does not describe how to verify the behavior of uspCancelOrder.

To write the database unit test for uspNewCustomer

  1. In the navigation bar of the Database Unit Test Designer, click Sales_uspNewCustomerTest, and make sure that Test is highlighted in the adjacent list.

    After you perform the previous step, you can create the test script for the test action in the unit test.

  2. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    -- database unit test for Sales.uspNewCustomer
DECLARE @RC AS INT, @CustomerName AS NVARCHAR (40);

SELECT @RC = 0,
       @CustomerName = 'Fictitious Customer';

EXECUTE @RC = [Sales].[uspNewCustomer] @CustomerName;

SELECT * FROM [Sales].[Customer];

  3. In the Test Conditions pane, click the Inconclusive test condition, and then click Delete Test Condition (x).

  4. In the Test Conditions pane, click Row Count in the list, and then click Add Test Condition (+).

  5. In the Properties window, set the Row Count property to 1.

  6. On the File menu, click Save All.

    Next you define the unit test logic for uspPlaceNewOrder.

To write the database unit test for uspPlaceNewOrder

  1. In the navigation bar of the Database Unit Test Designer, click Sales_uspPlaceNewOrderTest, and make sure that Test is highlighted in the adjacent list.

    After you perform this step, you can create the test script for the test action in the unit test.

  2. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    -- database unit test for Sales.uspPlaceNewOrder
DECLARE @RC AS INT, @CustomerID AS INT, @Amount AS INT, @OrderDate AS DATETIME, @Status AS CHAR (1);
DECLARE @CustomerName AS NVARCHAR(40);

SELECT @RC = 0,
       @CustomerID = 0,
       @CustomerName = N'Fictitious Customer',
       @Amount = 100,
       @OrderDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- place an order for that customer
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, @Amount, @OrderDate, @Status;

-- verify that the YTDOrders value is correct.
SELECT @RC = [YTDOrders] FROM [Sales].[Customer] WHERE [CustomerID] = @CustomerID

SELECT @RC AS RC

  3. In the Test Conditions pane, click the Inconclusive test condition, and click Delete Test Condition (x).

  4. In the Test Conditions pane, click Scalar Value in the list, and then click Add Test Condition (+).

  5. In the Properties window, set the Expected Value property to 100.

  6. In the navigation bar of the Database Unit Test Designer, click Sales_uspPlaceNewOrderTest, and make sure that Pre-Test is highlighted in the adjacent list.

    After you perform this step, you can specify statements that put your data into the state that is required to execute your test. For this example, you must create the Customer record before you can place an order.

  7. Click Click here to create to create a pre-test script.

  8. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    /*
Add Transact-SQL statements here that you want to run before
the test script is run.
*/
-- Add a customer for this test with the name 'Fictitious Customer'
DECLARE @NewCustomerID AS INT, @CustomerID AS INT, @RC AS INT, @CustomerName AS NVARCHAR (40);

SELECT @RC = 0,
       @NewCustomerID = 0,
   @CustomerID = 0,
       @CustomerName = N'Fictitious Customer';

IF NOT EXISTS(SELECT * FROM [Sales].[Customer] WHERE CustomerName = @CustomerName)
BEGIN
EXECUTE @NewCustomerID = [Sales].[uspNewCustomer] @CustomerName;
END

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- delete any old records in the Orders table and clear out the YTD Sales/Orders fields
DELETE from [Sales].[Orders] WHERE [CustomerID] = @CustomerID;
UPDATE [Sales].[Customer] SET YTDOrders = 0, YTDSales = 0 WHERE [CustomerID] = @CustomerID;

  9. On the File menu, click Save All.

    Next you create the unit test for uspFillOrder.

To write the database unit test for uspFillOrder

  1. In the navigation bar of the Database Unit Test Designer, click Sales_uspFillOrderTest, and make sure that Test is highlighted in the adjacent list.

    After you perform this step, you can create the test script for the test action in the unit test.

  2. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    -- database unit test for Sales.uspFillOrder
DECLARE @RC AS INT, @CustomerID AS INT, @Amount AS INT, @FilledDate AS DATETIME, @Status AS CHAR (1);
DECLARE @CustomerName AS NVARCHAR(40), @OrderID AS INT;

SELECT @RC = 0,
       @CustomerID = 0,
       @OrderID = 0,
       @CustomerName = N'Fictitious Customer',
       @Amount = 100,
       @FilledDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;
-- Get the most recently added order.
SELECT @OrderID = MAX([OrderID]) FROM [Sales].[Orders] WHERE [CustomerID] = @CustomerID;

-- fill an order for that customer
EXECUTE @RC = [Sales].[uspFillOrder] @OrderID, @FilledDate;

-- verify that the YTDOrders value is correct.
SELECT @RC = [YTDSales] FROM [Sales].[Customer] WHERE [CustomerID] = @CustomerID

SELECT @RC AS RC;

  3. In the Test Conditions pane, click the Inconclusive test condition, and click Delete Test Condition (x).

  4. In the Test Conditions pane, click Scalar Value in the list, and then click Add Test Condition (+).

  5. In the Properties window, set the Expected Value property to 100.

  6. In the navigation bar of the Database Unit Test Designer, click Sales_uspFillOrderTest, and make sure that Pre-Test is highlighted in the adjacent list. After you perform this step, you can specify statements that put your data into the state that is required to execute your test. For this example, you must create the Customer record before you can place an order.

  7. Click Click here to create to create a pre-test script.

  8. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    /*
Add Transact-SQL statements here that you want to run before
the test script is run.
*/
BEGIN TRANSACTION

-- Add a customer for this test with the name 'CustomerB'
DECLARE @NewCustomerID AS INT, @RC AS INT, @CustomerName AS NVARCHAR (40);

SELECT @RC = 0,
       @NewCustomerID = 0,
       @CustomerName = N'Fictitious Customer';

IF NOT EXISTS(SELECT * FROM [Sales].[Customer] WHERE CustomerName = @CustomerName)
BEGIN
EXECUTE @NewCustomerID = [Sales].[uspNewCustomer] @CustomerName;
END

DECLARE @CustomerID AS INT, @Amount AS INT, @OrderDate AS DATETIME, @Status AS CHAR (1);

SELECT @RC = 0,
       @CustomerID = 0,
       @CustomerName = N'Fictitious Customer',
       @Amount = 100,
       @OrderDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- delete any old records in the Orders table and clear out the YTD Sales/Orders fields
DELETE from [Sales].[Orders] WHERE [CustomerID] = @CustomerID;
UPDATE [Sales].[Customer] SET YTDOrders = 0, YTDSales = 0 WHERE [CustomerID] = @CustomerID;

-- place an order for that customer
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, @Amount, @OrderDate, @Status;

COMMIT TRANSACTION

  9. On the File menu, click Save All.

    At this point, you are ready to run your tests.

To write the database unit test for uspShowOrderDetails

  1. In the navigation bar of the Database Unit Test Designer, click Sales_uspShowOrderDetailsTest, and make sure that Test is highlighted in the adjacent list.

    After you perform this step, you can create the test script for the test action in the unit test.

  2. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    -- database unit test for Sales.uspFillOrder
DECLARE @RC AS INT, @CustomerID AS INT, @Amount AS INT, @FilledDate AS DATETIME, @Status AS CHAR (1);
DECLARE @CustomerName AS NVARCHAR(40), @OrderID AS INT;

SELECT @RC = 0,
       @CustomerID = 0,
       @OrderID = 0,
       @CustomerName = N'Fictitious Customer',
       @Amount = 100,
       @FilledDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- fill an order for that customer
EXECUTE @RC = [Sales].[uspShowOrderDetails] @CustomerID;

SELECT @RC AS RC;

  3. In the Test Conditions pane, click the Inconclusive test condition, and click Delete Test Condition (x).

  4. In the Test Conditions pane, click Expected Schema in the list, and then click Add Test Condition (+).

  5. In the Properties window, in the Configuration property, click the browse button ('…').

  6. In the Configuration for expectedSchemaCondition1 dialog box, specify a connection to your database.

  7. Click Retrieve.

    The Transact-SQL body of your unit test is executed, and the resulting schema appears in the dialog box. Because the pre-test code was not executed, no data is returned. As you are only verifying the schema and not the data, this is fine.

  8. Click OK.

    The expected schema is stored with the test condition.

  9. In the navigation bar of the Database Unit Test Designer, click Sales_uspShowOrderDetailsTest, and make sure that Pre-Test is highlighted in the adjacent list. After you perform this step, you can specify statements that put your data into the state that is required to execute your test. For this example, you must create the Customer record before you can place an order.

  10. Click Click here to create to create a pre-test script.

  11. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    /*
Add Transact-SQL statements here that you want to run before
the test script is run.
*/
BEGIN TRANSACTION

-- Add a customer for this test with the name 'FictitiousCustomer'
DECLARE @NewCustomerID AS INT, @RC AS INT, @CustomerName AS NVARCHAR (40);

SELECT @RC = 0,
       @NewCustomerID = 0,
       @CustomerName = N'Fictitious Customer';

IF NOT EXISTS(SELECT * FROM [Sales].[Customer] WHERE CustomerName = @CustomerName)
BEGIN
EXECUTE @NewCustomerID = [Sales].[uspNewCustomer] @CustomerName;
END


DECLARE @CustomerID AS INT, @Amount AS INT, @OrderDate AS DATETIME, @Status AS CHAR (1);

SELECT @RC = 0,
       @CustomerID = 0,
       @CustomerName = N'Fictitious Customer',
       @OrderDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- delete any old records in the Orders table and clear out the YTD Sales/Orders fields
DELETE from [Sales].[Orders] WHERE [CustomerID] = @CustomerID;
UPDATE [Sales].[Customer] SET YTDOrders = 0, YTDSales = 0 WHERE [CustomerID] = @CustomerID;

-- place 3 orders for that customer
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, 100, @OrderDate, @Status;
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, 50, @OrderDate, @Status;
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, 5, @OrderDate, @Status;

COMMIT TRANSACTION

  12. In the navigation bar of the Database Unit Test Designer, click Sales_uspShowOrderDetailsTest, and click Test in the adjacent list.

    You must do this because you want to apply the checksum condition to the test, not to the pre-test.

  13. In the Test Conditions pane, click Data Checksum in the list, and then click Add Test Condition (+).

  14. In the Properties window, in the Configuration property, click the browse button ('…').

  15. In the Configuration for checksumCondition1 dialog box, specify a connection to your database.

  16. Replace the Transact-SQL in the dialog box with the following code:

    BEGIN TRANSACTION

-- Add a customer for this test with the name 'CustomerB'
DECLARE @NewCustomerID AS INT, @RC AS INT, @CustomerName AS NVARCHAR (40);

SELECT @RC = 0,
       @NewCustomerID = 0,
       @CustomerName = N'Fictitious Customer';

IF NOT EXISTS(SELECT * FROM [Sales].[Customer] WHERE CustomerName = @CustomerName)
BEGIN
EXECUTE @NewCustomerID = [Sales].[uspNewCustomer] @CustomerName;
END


DECLARE @CustomerID AS INT, @Amount AS INT, @OrderDate AS DATETIME, @Status AS CHAR (1);

SELECT @RC = 0,
       @CustomerID = 0,
       @CustomerName = N'Fictitious Customer',
       @OrderDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- delete any old records in the Orders table and clear out the YTD Sales/Orders fields
DELETE from [Sales].[Orders] WHERE [CustomerID] = @CustomerID;
UPDATE [Sales].[Customer] SET YTDOrders = 0, YTDSales = 0 WHERE [CustomerID] = @CustomerID;



-- place 3 orders for that customer
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, 100, @OrderDate, @Status;
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, 50, @OrderDate, @Status;
EXECUTE @RC = [Sales].[uspPlaceNewOrder] @CustomerID, 5, @OrderDate, @Status;


COMMIT TRANSACTION


-- database unit test for Sales.uspFillOrder
DECLARE @FilledDate AS DATETIME;
DECLARE @OrderID AS INT;

SELECT @RC = 0,
       @CustomerID = 0,
       @OrderID = 0,
       @CustomerName = N'Fictitious Customer',
       @Amount = 100,
       @FilledDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- fill an order for that customer
EXECUTE @RC = [Sales].[uspShowOrderDetails] @CustomerID;

SELECT @RC AS RC;

    This code combines the Transact-SQL code from the pre-test with the Transact-SQL from the test itself. You need both in order to return the same results that the test will return when you run it.

  17. Click Retrieve.

    The Transact-SQL that you specified is executed, and a checksum is calculated for the returned data.

  18. Click OK.

    The calculated checksum is stored with the test condition. The expected checksum appears in the Value column of the Data Checksum test condition.

  19. On the File menu, click Save All.

    At this point, you are ready to run your tests.

Run Database Unit Tests

To run the database unit tests

  1. On the Test menu, point to Windows, and then click Test View.

  2. In the Test View window, click Refresh on the toolbar to update the list of tests.

    The Test View window lists the tests that you created earlier in this walkthrough and to which you added Transact-SQL statements and test conditions. The test that is named TestMethod1 is empty and is not used in this walkthrough.

  3. Right-click Sales_uspNewCustomerTest, and click Run Selection.

    Visual Studio uses the privileged context that you specified to connect to the database and apply the data generation plan. Visual Studio then switches to the execution context before it runs the Transact-SQL script in the test. Finally, Visual Studio evaluates the results of the Transact-SQL script against those that you specified in the test condition, and a result of either pass or fail appears in the Test Results window.

  4. View the result in the Test Results window.

    The test passes, which means that SELECT statement returns one row when it is run.

  5. Repeat step 3 for the Sales_uspPlaceNewOrderTest, Sales_uspFillOrderTest, and Sales_uspShowOrderDetailsTest tests. Results should be as follows:

    Test

    Expected Result

    Sales_uspPlaceNewOrderTest

    Pass

    Sales_uspShowOrderDetailsTest

    Pass

    Sales_uspFillOrderTest

    Fails with the following error: "ScalarValueCondition Condition (scalarValueCondition2) Failed: ResultSet 1 Row 1 Column 1: values do not match, actual '-100' expected '100'." This error occurs because the definition of the stored procedure contains a minor error.

    Next, you will correct the error and re-run your test.

To correct the error in Sales.uspFillOrder

  1. In Schema View, double-click the uspFillOrder stored procedure to open its definition in the Transact-SQL editor.

  2. In the definition, find the following Transact-SQL statement:

    UPDATE [Sales].[Customer]
   SET
   YTDSales = YTDSales - @Delta
    WHERE [CustomerID] = @CustomerID

  3. Change the SET clause in the statement to match the following statement:

    UPDATE [Sales].[Customer]
   SET
   YTDSales = YTDSales + @Delta
    WHERE [CustomerID] = @CustomerID

  4. On the File menu, click Save uspFillOrder.proc.sql.

  5. In the Test View, right-click Sales_uspFillOrderTest, and click Run Selection.

    The test passes.

Add a Negative Unit Test

You might create a negative test to verify that a test fails when it should fail. For example, if you try to cancel an order that was already filled, that test should fail. In this part of the walkthrough, you create a negative unit test for the Sales.uspCancelOrder stored procedure.

To create and verify a negative test, you must perform the following tasks:

  • Update the stored procedure to test for failure conditions

  • Define a new unit test

  • Modify the code for the unit test to indicate that is expected to fail

  • Run the unit test

To update the stored procedure

  1. In Schema View, expand the SimpleUnitTestDB node, expand the Schemas node, expand the Sales node, expand the Programmability node, expand the Stored Procedures node, and double-click uspCancelOrder.

  2. In the Transact-SQL editor, update the procedure definition to match the following code:

    CREATE PROCEDURE [Sales].[uspCancelOrder]
@OrderID INT
AS
BEGIN
    DECLARE @Delta INT, @CustomerID INT, @PriorStatus CHAR(1)
    BEGIN TRANSACTION
        BEGIN TRY
            IF (NOT EXISTS(SELECT [CustomerID] from [Sales].[Orders] WHERE [OrderID] = @OrderID))
            BEGIN
                -- Specify WITH LOG option so that the error is
                -- written to the application log.
                RAISERROR( 'That order does not exist.', -- Message text
                           16, -- severity
                            1 -- state
                        ) WITH LOG;
            END

            SELECT @Delta = [Amount], @CustomerID = [CustomerID], @PriorStatus = [Status]
             FROM [Sales].[Orders] WHERE [OrderID] = @OrderID

            IF @PriorStatus <> 'O' 
            BEGIN
                -- Specify WITH LOG option so that the error is
                -- written to the application log.
                RAISERROR ( 'You can only cancel open orders.', -- Message text
                            16, -- Severity
                            1 -- State
                            ) WITH LOG;
            END
            ELSE
            BEGIN
                -- If we make it to here, then we can cancel the order. Update the status to 'X' first...
                UPDATE [Sales].[Orders]
                   SET [Status] = 'X'
                WHERE [OrderID] = @OrderID
                -- and then remove the amount from the YTDOrders for the customer
                UPDATE [Sales].[Customer]
                       SET
                           YTDOrders = YTDOrders - @Delta
                WHERE [CustomerID] = @CustomerID
                COMMIT TRANSACTION
                RETURN 1; -- indicate success
            END
        END TRY
        BEGIN CATCH
            DECLARE @ErrorMessage NVARCHAR(4000);
            DECLARE @ErrorSeverity INT;
            DECLARE @ErrorState INT;

            SELECT @ErrorMessage = ERROR_MESSAGE(),
                   @ErrorSeverity = ERROR_SEVERITY(),
                   @ErrorState = ERROR_STATE();

            ROLLBACK TRANSACTION
            -- Use RAISERROR inside the CATCH block to return
            -- error information about the original error that
            -- caused execution to jump to the CATCH block.
            RAISERROR (@ErrorMessage, -- Mesasge text
                       @ErrorSeverity, -- Severity
                       @ErrorState -- State
                      );
            RETURN 0; -- indicate failure
        END CATCH;
END

  3. On the File menu, click Save uspCancelOrder.proc.sql.

  4. In Solution Explorer, right-click SimpleUnitTestDB and click Deploy.

    You deploy the updates to the uspCancelOrder stored procedure. You changed no other objects, so only that stored procedure is updated.

    Next you define the associated unit test for this procedure.

To write the database unit test for uspCancelOrder

  1. In the navigation bar of the Database Unit Test Designer, click Sales_uspCancelOrderTest, and make sure that Test is highlighted in the adjacent list.

    After you perform this step, you can create the test script for the test action in the unit test.

  2. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    -- database unit test for Sales.uspFillOrder
DECLARE @RC AS INT, @CustomerID AS INT, @Amount AS INT, @FilledDate AS DATETIME, @Status AS CHAR (1);
DECLARE @CustomerName AS NVARCHAR(40), @OrderID AS INT;

SELECT @RC = 0,
       @CustomerID = 0,
       @OrderID = 0,
       @CustomerName = N'Fictitious Customer',
       @Amount = 100,
       @FilledDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;
-- Get the most recently added order.
SELECT @OrderID = MAX([OrderID]) FROM [Sales].[Orders] WHERE [CustomerID] = @CustomerID;

-- try to cancel an order for that customer that has already been filled
EXECUTE @RC = [Sales].[uspCancelOrder] @OrderID;

SELECT @RC AS RC;

  3. In the Test Conditions pane, click the Inconclusive test condition, and click Delete Test Condition (x).

  4. In the Test Conditions pane, click Scalar Value in the list, and then click Add Test Condition (+).

  5. In the Properties window, set the Expected Value property to 0.

  6. In the navigation bar of the Database Unit Test Designer, click Sales_uspCancelOrderTest, and make sure that Pre-Test is highlighted in the adjacent list. After you perform this step, you can specify statements that put your data into the state that is required to execute your test. For this example, you must create the Customer record before you can place an order.

  7. Click Click here to create to create a pre-test script.

  8. Update the Transact-SQL statements in the Transact-SQL editor to match the following statements:

    /*
Add Transact-SQL statements here that you want to run before
the test script is run.
*/
BEGIN TRANSACTION

-- Add a customer for this test with the name 'CustomerB'
DECLARE @NewCustomerID AS INT, @RC AS INT, @CustomerName AS NVARCHAR (40);

SELECT @RC = 0,
       @NewCustomerID = 0,
       @CustomerName = N'Fictitious Customer';

IF NOT EXISTS(SELECT * FROM [Sales].[Customer] WHERE CustomerName = @CustomerName)
BEGIN
EXECUTE @NewCustomerID = [Sales].[uspNewCustomer] @CustomerName;
END

DECLARE @CustomerID AS INT, @Amount AS INT, @OrderDate AS DATETIME, @FilledDate AS DATETIME, @Status AS CHAR (1), @OrderID AS INT;

SELECT @RC = 0,
       @CustomerID = 0,
   @OrderID = 0,
       @CustomerName = N'Fictitious Customer',
       @Amount = 100,
       @OrderDate = getdate(),
   @FilledDate = getdate(),
       @Status = 'O';

-- NOTE: Assumes that you inserted a Customer record with CustomerName='Fictitious Customer' in the pre-test script.
SELECT @CustomerID = [CustomerID] FROM [Sales].[Customer] WHERE [CustomerName] = @CustomerName;

-- delete any old records in the Orders table and clear out the YTD Sales/Orders fields
DELETE from [Sales].[Orders] WHERE [CustomerID] = @CustomerID;
UPDATE [Sales].[Customer] SET YTDOrders = 0, YTDSales = 0 WHERE [CustomerID] = @CustomerID;

-- place an order for that customer
EXECUTE @OrderID = [Sales].[uspPlaceNewOrder] @CustomerID, @Amount, @OrderDate, @Status;

-- fill the order for that customer
EXECUTE @RC = [Sales].[uspFillOrder] @OrderID, @FilledDate;

COMMIT TRANSACTION

  9. On the File menu, click Save All.

    At this point, you are ready to run your tests.

To run the database unit tests

  1. In Test View, right-click Sales_uspCancelOrderTest, and click Run Selection.

  2. View the result in the Test Results window.

    The test fails and the following error appears:

    Test method TestProject1.DatabaseUnitTests1.Sales_uspCancelOrderTest threw exception: System.Data.SqlClient.SqlException: You can only cancel open orders.

    Next, you modify the code to indicate that the exception is expected.

To modify the code for the unit test

  1. In Solution Explorer, expand TestProject1, right-click DatabaseUnitTests1.cs, and click View Code.

  2. In the code editor, navigate to the Sales_uspCancelOrderTest method. Modify the attributes of the method to match the following code:

            [TestMethod(), ExpectedSqlException(Severity=16, MatchFirstError=false, State=1)]
        public void Sales_uspCancelOrderTest()

    You specify that you expect to see a specific SQL exception. You can optionally specify a specific error number. If you do not add this attribute, the unit test will fail, and a message appears in the Test Results window

  3. On the File menu, click Save DatabaseUnitTests1.cs.

    Next, you re-run your unit test to verify that it fails as expected.

To re-run the database unit tests

  1. In Test View, right-click Sales_uspCancelOrderTest, and click Run Selection.

  2. View the result in the Test Results window.

    The test passes, which means that the procedure failed when it was supposed to fail.

Next Steps

In a typical project, you would define additional unit tests to verify that all critical database objects work correctly. When the set of tests is complete, you would check those tests into version control to share them with the team.

After you establish a baseline, you can create and modify database objects and then create associated tests to verify whether a change will break expected behavior.

See Also

Tasks

How to: Create an Empty Database Unit Test

How to: Configure Database Unit Test Execution

Concepts

Creating and Defining Database Unit Tests

Verifying Database Code by Using Unit Tests

Generating Test Data for Databases by Using Data Generators