Add TEST_MATIX option for parameterization

Added matrix option for parameterization that generates cases based on
the product of the given arguments.

src/unity.h

@@ -89,7 +89,7 @@ void verifyTest(void);
  *     - define UNITY_SUPPORT_TEST_CASES to include the TEST_CASE macro, though really it's mostly about the runner generator script
 
  * Parameterized Tests
- *     - you'll want to create a define of TEST_CASE(...) and/or TEST_RANGE(...) which basically evaluates to nothing
+ *     - you'll want to create a define of TEST_CASE(...), TEST_RANGE(...) and/or TEST_MATRIX(...) which basically evaluates to nothing
 
  * Tests with Arguments
  *     - you'll want to define UNITY_USE_COMMAND_LINE_ARGS if you have the test runner passing arguments to Unity

src/unity_internals.h

@@ -793,6 +793,9 @@ extern const char UnityStrErrShorthand[];
     #if !defined(TEST_RANGE) && !defined(UNITY_EXCLUDE_TEST_RANGE)
       #define TEST_RANGE(...)
     #endif
+    #if !defined(TEST_MATRIX) && !defined(UNITY_EXCLUDE_TEST_MATRIX)
+      #define TEST_MATRIX(...)
+    #endif
   #endif
 #endif