tests(other): increase coverage for commaSeparatedReturn (negative case; no comma in return)

Signed-off-by: Aryan Rahar <aryanrahar1@gmail.com>

Author: aryanrahar

test/testother.cpp

@@ -11152,9 +11152,8 @@ class TestOther : public TestFixture {
     {
         check(
             "int f(){\n"
-            "  int a = 0, b = 1;\n"
-            "  a = (a, b);      // comma in assignment, not in return\n"
-            "  return a;        // plain return\n"
+            "  int a = 0;\n"
+            "  return a;\n"
             "}\n",
             true, false, false
             );

test/teststl.cpp

@@ -176,7 +176,6 @@ class TestStl : public TestFixture {
 
         TEST_CASE(checkKnownEmptyContainer);
         TEST_CASE(checkMutexes);
-        TEST_CASE(commaSeparatedReturn_no_fp);
     }
 
     struct CheckOptions
@@ -7202,17 +7201,6 @@ class TestStl : public TestFixture {
               "}\n");
         ASSERT_EQUALS("", errout_str());
     }
-     void commaSeparatedReturn_no_fp()
-{
-    check(
-        "int g(){\n"
-        "    int a = 0, b = 1;\n"
-        "    a = (a, b);      // comma operator in an assignment, not in return\n"
-        "    return a;        // plain return, should not trigger\n"
-        "}\n"
-    );
-    ASSERT_EQUALS("", errout_str());
-}
 };
 
 REGISTER_TEST(TestStl)