[Refactor]: Remove underscore in C++ test suite names and test names

[Bai-Li-NOAA]

Refactor request

We should rename GoogleTest test suite names and test names without using underscore (_). GoogleTest reserves underscore for special purpose keywords. For example, the two tests below will both generate the same class (Time_Flies_Like_An_Arrow_Test) when using underscore. More details can be found in GoogleTest FAQ page.

TEST(Time, Flies_Like_An_Arrow) { ... }
TEST(Time_Flies, Like_An_Arrow) { ... }

Expected behavior

Test suite names and test names must be non-empty, unique, and may only contain ASCII alphanumeric characters. Use Camel case for names.

Code of Conduct

• I agree to follow this project's Code of Conduct

[kellijohnson-NOAA]

Guidance on using TEST() from GoogleTest Primer indicates that the arguments for TEST() go from general to specific. The first argument is the name of the test suite, and the second argument is the test’s name within the test suite. Both names must be valid C++ identifiers, and they should not contain any underscores (_). A test’s full name consists of its containing test suite and its individual name. Tests from different test suites can have the same individual name.

[k-doering-NOAA]

changes in main