docs: Add documentation for Git module tests

- Added documentation for the Git module's test scripts, including
  test structure, running instructions, and details of each test.
- Added links to Git module tests in the main Rhai documentation.
- Improved overall structure and clarity of the Rhai documentation.

src/rhai_tests/git/01_git_basic.rhai

@@ -0,0 +1,76 @@
+// 01_git_basic.rhai
+// Tests for basic Git operations in the Git module
+
+// Custom assert function
+fn assert_true(condition, message) {
+    if !condition {
+        print(`ASSERTION FAILED: ${message}`);
+        throw message;
+    }
+}
+
+// Create a temporary directory for Git operations
+let test_dir = "rhai_test_git";
+mkdir(test_dir);
+print(`Created test directory: ${test_dir}`);
+
+// Test GitTree constructor
+print("Testing GitTree constructor...");
+let git_tree = git_tree_new(test_dir);
+print("✓ GitTree created successfully");
+
+// Test GitTree.list() with empty directory
+print("Testing GitTree.list() with empty directory...");
+let repos = git_tree.list();
+assert_true(repos.len() == 0, "Expected empty list of repositories");
+print(`✓ GitTree.list(): Found ${repos.len()} repositories (expected 0)`);
+
+// Test GitTree.find() with empty directory
+print("Testing GitTree.find() with empty directory...");
+let found_repos = git_tree.find("*");
+assert_true(found_repos.len() == 0, "Expected empty list of repositories");
+print(`✓ GitTree.find(): Found ${found_repos.len()} repositories (expected 0)`);
+
+// Test GitTree.get() with a URL to clone a repository
+// We'll use a small, public repository for testing
+print("Testing GitTree.get() with URL...");
+let repo_url = "https://github.com/rhaiscript/playground.git";
+let repo = git_tree.get(repo_url);
+print(`✓ GitTree.get(): Repository cloned successfully to ${repo.path()}`);
+
+// Test GitRepo.path()
+print("Testing GitRepo.path()...");
+let repo_path = repo.path();
+assert_true(repo_path.contains(test_dir), "Repository path should contain test directory");
+print(`✓ GitRepo.path(): ${repo_path}`);
+
+// Test GitRepo.has_changes()
+print("Testing GitRepo.has_changes()...");
+let has_changes = repo.has_changes();
+print(`✓ GitRepo.has_changes(): ${has_changes}`);
+
+// Test GitTree.list() after cloning
+print("Testing GitTree.list() after cloning...");
+let repos_after_clone = git_tree.list();
+assert_true(repos_after_clone.len() > 0, "Expected non-empty list of repositories");
+print(`✓ GitTree.list(): Found ${repos_after_clone.len()} repositories`);
+
+// Test GitTree.find() after cloning
+print("Testing GitTree.find() after cloning...");
+let found_repos_after_clone = git_tree.find("*");
+assert_true(found_repos_after_clone.len() > 0, "Expected non-empty list of repositories");
+print(`✓ GitTree.find(): Found ${found_repos_after_clone.len()} repositories`);
+
+// Test GitTree.get() with a path to an existing repository
+print("Testing GitTree.get() with path...");
+let repo_name = repos_after_clone[0];
+let repo_by_path = git_tree.get(repo_name);
+print(`✓ GitTree.get(): Repository opened successfully from ${repo_by_path.path()}`);
+
+// Clean up
+print("Cleaning up...");
+delete(test_dir);
+assert_true(!exist(test_dir), "Directory deletion failed");
+print(`✓ Cleanup: Directory ${test_dir} removed`);
+
+print("All basic Git tests completed successfully!");