Add test files

tests/test_cli.py

@@ -0,0 +1,83 @@
+"""Tests for CLI interface."""
+
+import pytest
+from click.testing import CliRunner
+from cronparse.cli import main
+
+
+class TestCLI:
+    """Tests for CLI commands."""
+
+    @pytest.fixture
+    def runner(self):
+        """Create CLI runner."""
+        return CliRunner()
+
+    def test_version_option(self, runner):
+        """Test --version option."""
+        result = runner.invoke(main, ["--version"])
+        assert result.exit_code == 0
+        assert "cronparse" in result.output.lower()
+
+    def test_help_option(self, runner):
+        """Test --help option."""
+        result = runner.invoke(main, ["--help"])
+        assert result.exit_code == 0
+        assert "Usage:" in result.output
+
+    def test_parse_valid_expression(self, runner):
+        """Test parse command with valid expression."""
+        result = runner.invoke(main, ["parse", "* * * * *"])
+        assert result.exit_code == 0
+        assert "Valid" in result.output or "minute" in result.output
+
+    def test_parse_invalid_expression(self, runner):
+        """Test parse command with invalid expression."""
+        result = runner.invoke(main, ["parse", "invalid"])
+        assert result.exit_code != 0
+        assert "Error" in result.output
+
+    def test_next_command(self, runner):
+        """Test next command."""
+        result = runner.invoke(main, ["next", "* * * * *", "--count", "3"])
+        assert result.exit_code == 0
+        assert "#1" in result.output or "executions" in result.output.lower()
+
+    def test_explain_command(self, runner):
+        """Test explain command."""
+        result = runner.invoke(main, ["explain", "0 9 * * *"])
+        assert result.exit_code == 0
+        assert "Description" in result.output or "9" in result.output
+
+    def test_from_text_command(self, runner):
+        """Test from-text command."""
+        result = runner.invoke(main, ["from-text", "daily", "at", "9am"])
+        assert result.exit_code == 0
+        assert "Cron" in result.output or "cron" in result.output
+
+    def test_generate_command_exists(self, runner):
+        """Test that generate command exists."""
+        result = runner.invoke(main, ["generate", "--help"])
+        assert result.exit_code == 0
+
+    def test_invalid_subcommand(self, runner):
+        """Test that invalid subcommand shows error."""
+        result = runner.invoke(main, ["invalid_command"])
+        assert result.exit_code != 0
+        assert "No such command" in result.output
+
+    def test_parse_json_output(self, runner):
+        """Test parse command with JSON output."""
+        result = runner.invoke(main, ["parse", "* * * * *", "--json"])
+        assert result.exit_code == 0
+        assert "minute" in result.output
+
+    def test_next_json_output(self, runner):
+        """Test next command with JSON output."""
+        result = runner.invoke(main, ["next", "* * * * *", "--count", "3", "--json"])
+        assert result.exit_code == 0
+
+    def test_next_no_timeline(self, runner):
+        """Test next command without timeline."""
+        result = runner.invoke(main, ["next", "* * * * *", "--count", "3", "--no-timeline"])
+        assert result.exit_code == 0