fix: improve test cases for mingw

In the MinGW environment, the path separator is the forward slash.
However, currently the test cases expect the backward slash, which
causes test failures.

In this patch, we improve the test cases for arg_filexxx API, so they
expect forward slash and can pass the unit tests.

tests/testargfile.c

@@ -710,7 +710,7 @@ void test_argfile_basic_032(CuTest* tc) {
     arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
 }
 
-#ifdef WIN32
+#if defined(WIN32) && !defined(__MINGW32__)
 void test_argfile_basic_033(CuTest* tc) {
     struct arg_file* a = arg_filen(NULL, NULL, "<file>", 0, 3, "filename to test");
     struct arg_end* end = arg_end(20);
@@ -760,7 +760,57 @@ void test_argfile_basic_034(CuTest* tc) {
 
     arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
 }
-#endif /* #ifdef WIN32 */
+#else
+void test_argfile_basic_033(CuTest* tc) {
+    struct arg_file* a = arg_filen(NULL, NULL, "<file>", 0, 3, "filename to test");
+    struct arg_end* end = arg_end(20);
+    void* argtable[] = {a, end};
+    int nerrors;
+
+    char* argv[] = {"program", "/test folder/", "/test folder2", NULL};
+    int argc = sizeof(argv) / sizeof(char*) - 1;
+
+    CuAssertTrue(tc, arg_nullcheck(argtable) == 0);
+    nerrors = arg_parse(argc, argv, argtable);
+
+    CuAssertTrue(tc, nerrors == 0);
+    CuAssertTrue(tc, a->count == 2);
+    CuAssertStrEquals(tc, a->filename[0], "/test folder/");
+    CuAssertStrEquals(tc, a->basename[0], "");
+    CuAssertStrEquals(tc, a->extension[0], "");
+    CuAssertStrEquals(tc, a->filename[1], "/test folder2");
+    CuAssertStrEquals(tc, a->basename[1], "test folder2");
+    CuAssertStrEquals(tc, a->extension[1], "");
+
+    arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
+}
+
+void test_argfile_basic_034(CuTest* tc) {
+    struct arg_file* a = arg_filen(NULL, NULL, "<file>", 1, 1, "path a");
+    struct arg_file* b = arg_filen(NULL, NULL, "<file>", 1, 1, "path b");
+    struct arg_end* end = arg_end(20);
+    void* argtable[] = {a, b, end};
+    int nerrors;
+
+    char* argv[] = {"program", "/test folder/", "/test folder2", NULL};
+    int argc = sizeof(argv) / sizeof(char*) - 1;
+
+    CuAssertTrue(tc, arg_nullcheck(argtable) == 0);
+    nerrors = arg_parse(argc, argv, argtable);
+
+    CuAssertTrue(tc, nerrors == 0);
+    CuAssertTrue(tc, a->count == 1);
+    CuAssertStrEquals(tc, a->filename[0], "/test folder/");
+    CuAssertStrEquals(tc, a->basename[0], "");
+    CuAssertStrEquals(tc, a->extension[0], "");
+    CuAssertTrue(tc, b->count == 1);
+    CuAssertStrEquals(tc, b->filename[0], "/test folder2");
+    CuAssertStrEquals(tc, b->basename[0], "test folder2");
+    CuAssertStrEquals(tc, b->extension[0], "");
+
+    arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
+}
+#endif /* #if defined(WIN32) && !defined(__MINGW32__) */
 
 CuSuite* get_argfile_testsuite() {
     CuSuite* suite = CuSuiteNew();
@@ -796,11 +846,8 @@ CuSuite* get_argfile_testsuite() {
     SUITE_ADD_TEST(suite, test_argfile_basic_030);
     SUITE_ADD_TEST(suite, test_argfile_basic_031);
     SUITE_ADD_TEST(suite, test_argfile_basic_032);
-#ifdef WIN32
     SUITE_ADD_TEST(suite, test_argfile_basic_033);
     SUITE_ADD_TEST(suite, test_argfile_basic_034);
-#endif /* #ifdef WIN32 */
-
     return suite;
 }