tests: Add test for valid_tls_policy_option()

See last commit with comment regarding cons_show().

In this test here we can see that if we pass NULL cons_show() isn't
called. Making it a bit different that other invalid test cases.

tests/unittests/test_common.c

@@ -328,6 +328,30 @@ strip_quotes_strips_both(void** state)
     free(result);
 }
 
+void test_valid_tls_policy_option(void** state) {
+    // Valid inputs
+    assert_true(valid_tls_policy_option("force"));
+    assert_true(valid_tls_policy_option("allow"));
+    assert_true(valid_tls_policy_option("trust"));
+    assert_true(valid_tls_policy_option("disable"));
+    assert_true(valid_tls_policy_option("legacy"));
+    assert_true(valid_tls_policy_option("direct"));
+
+    // Invalid inputs
+    // Not an option
+    expect_any_cons_show(); // For "Invalid TLS policy: 'profanity'"
+    expect_any_cons_show(); // For "TLS policy must be one of: 'force', 'allow', 'trust', 'disable', 'legacy', or 'direct'."
+    assert_false(valid_tls_policy_option("profanity"));
+
+    // Empty
+    expect_any_cons_show(); // For "Invalid TLS policy: ''"
+    expect_any_cons_show(); // For "TLS policy must be one of: 'force', 'allow', 'trust', 'disable', 'legacy', or 'direct'."
+    assert_false(valid_tls_policy_option(""));
+
+	// NULL
+    assert_true(valid_tls_policy_option(NULL));
+}
+
 void test_get_expanded_path(void** state) {
     gchar* expanded_path;
 

tests/unittests/test_common.h

@@ -42,3 +42,4 @@ void test_strtoi_range_invalid_input(void** state);
 void test_strtoi_range_null_empty_input(void** state);
 void test_strtoi_range_null_err_msg(void** state);
 void test_string_matches_one_of_edge_cases(void** state);
+void test_valid_tls_policy_option(void** state);

tests/unittests/unittests.c

@@ -102,7 +102,7 @@ main(int argc, char* argv[])
         cmocka_unit_test(test_strtoi_range_null_empty_input),
         cmocka_unit_test(test_strtoi_range_null_err_msg),
         cmocka_unit_test(test_string_matches_one_of_edge_cases),
-
+        cmocka_unit_test(test_valid_tls_policy_option),
         cmocka_unit_test(clear_empty),
         cmocka_unit_test(reset_after_create),
         cmocka_unit_test(find_after_create),