Partial Code Coverage in Google test for ASSERT and EXPECT

Question

Partial Code Coverage in Google test for ASSERT and EXPECT

NewCodee 1

I have the following sample piece of code in google test project:

TEST(methodName, testcase) {
EXPECT_EQ(1, 1);
EXPECT_TRUE(true);

}

When I analyze code coverage in visual studio 2019 enterprise, I am getting partial code coverage

What changes needs to be done to get full code coverage?

Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2021-12-16T07:04:20.75+00:00

Hello @NewCodee , welcome to Microsoft Q&A forum.

From the codes and screenshot you shared, it seems it’s the default codes/template that Google Test project provided. May I ask which part, code coverage feature doesn’t cover? EXPECT_EQ(1,1); and EXPECT_TRUE(true);? If you edit the google test codes, match and test some methods of your C++ project, will you get full code coverage for these methods? Feel free to contact me.
NewCodee 1 Reputation point

2021-12-17T05:43:09.177+00:00

Hello @Tianyu Sun-MSFT . Thank you for your reply.
Yes, EXPECT_EQ(1,1); and EXPECT_TRUE(true); are the partially covered lines (indicated in yellow color). Even if I edit google test codes and test some of the methods of my C++ project, I am getting partial coverage for ASSERT and EXPECT statements in the google test project. Below is the sample screenshot of the edited code.
Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2021-12-17T10:12:24.847+00:00

Hi @NewCodee , thank you for the confirmation. In some situations, partially coverage will occur and sometimes it is acceptable, for example, like this document: Analyze code coverage mentioned

In some situations, lower coverage is acceptable. For example, lower coverage is acceptable where some code is generated from a standard template.

You can see that there are many global functions/classes and they are not covered while unit testing, but don't worry too much.
NewCodee 1 Reputation point

2021-12-17T10:17:02.037+00:00

Thank you @Tianyu Sun-MSFT , I appreciate the information you have provided me with.
Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2021-12-20T01:48:09.1+00:00

No problem, have a great day :)

Your answer

Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2021-12-16T07:04:20.75+00:00

Hello @NewCodee , welcome to Microsoft Q&A forum.

From the codes and screenshot you shared, it seems it’s the default codes/template that Google Test project provided. May I ask which part, code coverage feature doesn’t cover? EXPECT_EQ(1,1); and EXPECT_TRUE(true);? If you edit the google test codes, match and test some methods of your C++ project, will you get full code coverage for these methods? Feel free to contact me.
NewCodee 1 Reputation point

2021-12-17T05:43:09.177+00:00

Hello @Tianyu Sun-MSFT . Thank you for your reply.
Yes, EXPECT_EQ(1,1); and EXPECT_TRUE(true); are the partially covered lines (indicated in yellow color). Even if I edit google test codes and test some of the methods of my C++ project, I am getting partial coverage for ASSERT and EXPECT statements in the google test project. Below is the sample screenshot of the edited code.
Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2021-12-17T10:12:24.847+00:00

Hi @NewCodee , thank you for the confirmation. In some situations, partially coverage will occur and sometimes it is acceptable, for example, like this document: Analyze code coverage mentioned

In some situations, lower coverage is acceptable. For example, lower coverage is acceptable where some code is generated from a standard template.

You can see that there are many global functions/classes and they are not covered while unit testing, but don't worry too much.
NewCodee 1 Reputation point

2021-12-17T10:17:02.037+00:00

Thank you @Tianyu Sun-MSFT , I appreciate the information you have provided me with.
Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2021-12-20T01:48:09.1+00:00

No problem, have a great day :)

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Partial Code Coverage in Google test for ASSERT and EXPECT

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