Test 2 Stein tie

src/test/c/test_SchereSteinPapier.c

@@ -20,6 +20,19 @@ void test_SchereSteinPapier_Tie_Schere(void)
 	/* act */
 	actual = game('1', '1');
 
+	/* assert */
+	TEST_ASSERT_EQUAL_INT(expected, actual);
+}
+
+void test_SchereSteinPapier_Tie_Stein(void)
+{
+	/* arrange */
+	int expected = -1;
+	int actual;
+
+	/* act */
+	actual = game('2', '2');
+
 	/* assert */
 	TEST_ASSERT_EQUAL_INT(expected, actual);
 }