diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..a344617
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,79 @@
+"""Tests for CLI commands."""
+
+from click.testing import CliRunner
+import pytest
+
+from i18n_guardian.cli import main
+
+
+@pytest.fixture
+def runner():
+    """Create a Click CLI runner."""
+    return CliRunner()
+
+
+class TestCLIBasic:
+    """Basic CLI tests."""
+
+    def test_version(self, runner):
+        """Test --version option."""
+        result = runner.invoke(main, ["--version"])
+        assert result.exit_code == 0
+        assert "i18n-guardian" in result.output.lower()
+
+    def test_help(self, runner):
+        """Test --help option."""
+        result = runner.invoke(main, ["--help"])
+        assert result.exit_code == 0
+        assert "scan" in result.output.lower()
+        assert "fix" in result.output.lower()
+        assert "init" in result.output.lower()
+        assert "check" in result.output.lower()
+
+
+class TestScanCommand:
+    """Tests for scan command."""
+
+    def test_scan_no_path(self, runner):
+        """Test scan without path."""
+        result = runner.invoke(main, ["scan"])
+        assert result.exit_code == 0
+
+    def test_scan_with_verbose(self, runner, temp_dir):
+        """Test scan with verbose flag."""
+        result = runner.invoke(main, ["--verbose", "--path", str(temp_dir), "scan"])
+        assert result.exit_code == 0
+
+    def test_scan_output_format(self, runner, temp_dir):
+        """Test scan with different output formats."""
+        for fmt in ["text", "json"]:
+            result = runner.invoke(main, ["--path", str(temp_dir), "scan", "--output", fmt])
+            assert result.exit_code == 0
+
+
+class TestFixCommand:
+    """Tests for fix command."""
+
+    def test_fix_dry_run(self, runner, temp_dir):
+        """Test fix with dry-run flag."""
+        result = runner.invoke(main, ["--path", str(temp_dir), "fix", "--dry-run"])
+        assert result.exit_code == 0
+
+
+class TestInitCommand:
+    """Tests for init command."""
+
+    def test_init_output(self, runner, temp_dir):
+        """Test init command output."""
+        output_path = str(temp_dir / ".i18n-guardian.yaml")
+        result = runner.invoke(main, ["init", "--output", output_path])
+        assert result.exit_code == 0
+
+
+class TestCheckCommand:
+    """Tests for check command."""
+
+    def test_check_ci_output(self, runner, temp_dir):
+        """Test check command with CI options."""
+        result = runner.invoke(main, ["--path", str(temp_dir), "check", "--output", "json"])
+        assert result.exit_code == 0