fix: add ** glob_match test cases (issue #67)

tests/test_glob.c

@@ -49,6 +49,33 @@ static void test_glob_question_star() {
   EXPECT_TRUE(glob_match("?*.txt", "a.txt"));
 }
 
+static void test_glob_doublestar_all() {
+  EXPECT_TRUE(glob_match("**", "anything"));
+  EXPECT_TRUE(glob_match("**", "path/to/file.txt"));
+  EXPECT_TRUE(glob_match("**", ""));
+}
+
+static void test_glob_doublestar_prefix() {
+  EXPECT_TRUE(glob_match("a/**/b", "a/b"));
+  EXPECT_TRUE(glob_match("a/**/b", "a/x/b"));
+  EXPECT_TRUE(glob_match("a/**/b", "a/x/y/b"));
+  EXPECT_FALSE(glob_match("a/**/b", "a/x/y/c"));
+}
+
+static void test_glob_doublestar_suffix() {
+  EXPECT_TRUE(glob_match("a/**", "a/b"));
+  EXPECT_TRUE(glob_match("a/**", "a/b/c/d"));
+  EXPECT_TRUE(glob_match("a/**", "a/"));
+  EXPECT_FALSE(glob_match("a/**", "b/a"));
+}
+
+static void test_glob_doublestar_subdir() {
+  EXPECT_TRUE(glob_match("**/foo", "foo"));
+  EXPECT_TRUE(glob_match("**/foo", "bar/foo"));
+  EXPECT_TRUE(glob_match("**/foo", "a/b/c/foo"));
+  EXPECT_FALSE(glob_match("**/foo", "foobar"));
+}
+
 void test_glob() {
   test_glob_exact_match();
   test_glob_question_mark();
@@ -60,4 +87,8 @@ void test_glob() {
   test_glob_slash_not_matched();
   test_glob_complex();
   test_glob_question_star();
+  test_glob_doublestar_all();
+  test_glob_doublestar_prefix();
+  test_glob_doublestar_suffix();
+  test_glob_doublestar_subdir();
 }