[clang-tidy][NFC] Improve naming convention in google-readability-avoid-underscore-in-googletest-name

According to the Google docs, the convention is
TEST(TestSuiteName, TestName). Apply that convention to the
source code, test and documentation of the check.

Differential Revision: https://reviews.llvm.org/D146713

Author: carlosgalvezp

clang-tools-extra/clang-tidy/google/AvoidUnderscoreInGoogletestNameCheck.cpp

@@ -47,18 +47,19 @@ class AvoidUnderscoreInGoogletestNameCallback : public PPCallbacks {
     if (!isGoogletestTestMacro(MacroName) || !Args ||
         Args->getNumMacroArguments() < 2)
       return;
-    const Token *TestCaseNameToken = Args->getUnexpArgument(0);
+    const Token *TestSuiteNameToken = Args->getUnexpArgument(0);
     const Token *TestNameToken = Args->getUnexpArgument(1);
-    if (!TestCaseNameToken || !TestNameToken)
+    if (!TestSuiteNameToken || !TestNameToken)
       return;
-    std::string TestCaseNameMaybeDisabled = PP->getSpelling(*TestCaseNameToken);
-    StringRef TestCaseName = TestCaseNameMaybeDisabled;
-    TestCaseName.consume_front(KDisabledTestPrefix);
-    if (TestCaseName.contains('_'))
-      Check->diag(TestCaseNameToken->getLocation(),
-                  "avoid using \"_\" in test case name \"%0\" according to "
+    std::string TestSuiteNameMaybeDisabled =
+        PP->getSpelling(*TestSuiteNameToken);
+    StringRef TestSuiteName = TestSuiteNameMaybeDisabled;
+    TestSuiteName.consume_front(KDisabledTestPrefix);
+    if (TestSuiteName.contains('_'))
+      Check->diag(TestSuiteNameToken->getLocation(),
+                  "avoid using \"_\" in test suite name \"%0\" according to "
                   "Googletest FAQ")
-          << TestCaseName;
+          << TestSuiteName;
 
     std::string TestNameMaybeDisabled = PP->getSpelling(*TestNameToken);
     StringRef TestName = TestNameMaybeDisabled;

clang-tools-extra/docs/clang-tidy/checks/google/readability-avoid-underscore-in-googletest-name.rst

@@ -3,8 +3,8 @@
 google-readability-avoid-underscore-in-googletest-name
 ======================================================
 
-Checks whether there are underscores in googletest test and test case names in
-test macros:
+Checks whether there are underscores in googletest test suite names and test
+names in test macros:
 
 - ``TEST``
 - ``TEST_F``
@@ -18,17 +18,17 @@ For example:
 
 .. code-block:: c++
 
-  TEST(TestCaseName, Illegal_TestName) {}
-  TEST(Illegal_TestCaseName, TestName) {}
+  TEST(TestSuiteName, Illegal_TestName) {}
+  TEST(Illegal_TestSuiteName, TestName) {}
 
-would trigger the check. `Underscores are not allowed`_ in test names nor test
-case names.
+would trigger the check. `Underscores are not allowed`_ in test suite name nor
+test names.
 
-The ``DISABLED_`` prefix, which may be used to `disable individual tests`_, is
-ignored when checking test names, but the rest of the rest of the test name is
-still checked.
+The ``DISABLED_`` prefix, which may be used to
+`disable test suites and individual tests`_, is removed from the test suite name
+and test name before checking for underscores.
 
 This check does not propose any fixes.
 
 .. _Underscores are not allowed: https://google.github.io/googletest/faq.html#why-should-test-suite-names-and-test-names-not-contain-underscore
-.. _disable individual tests: https://google.github.io/googletest/advanced.html#temporarily-disabling-tests
+.. _disable test suites and individual tests: https://google.github.io/googletest/advanced.html#temporarily-disabling-tests