added a test case for the command by id caller

src/main/c/Georg/tictactoe.h

@@ -21,6 +21,7 @@ int handleCommand( char* input );
 struct command* createCommands();
 
 /* commands */
+commandFunction getCommandById(struct command* commands, int id);
 int startMenu();
 int startGame();
 

src/test/c/Georg/test_tictactoe.c

@@ -86,4 +86,16 @@ void test_createCommandlist(void){
     for (size_t i = 0; i < arraySize; i++) {
         TEST_ASSERT_EQUAL_INT( 1, commands[i].fun() );
     }
+}
+
+void test_callCommandById(void){
+    // arrange
+    struct command* commands = NULL;
+
+    // act
+    commands = createCommands();
+    commandFunction actualCommand = getCommandById( commands, 1);
+
+    // assert
+    TEST_ASSERT_EQUAL_PTR( startMenu, actualCommand );
 }