Add test files

tests/test_cli.py

@@ -0,0 +1,95 @@
+"""Tests for the CLI module."""
+
+import json
+import pytest
+from click.testing import CliRunner
+
+from regex_humanizer.cli import main
+
+
+class TestCLIMain:
+    def test_main_help(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["--help"])
+        assert result.exit_code == 0
+        assert "Regex Humanizer" in result.output
+
+    def test_main_version(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["--version"])
+        assert result.exit_code == 0
+        assert "0.1.0" in result.output
+
+
+class TestExplainCommand:
+    def test_explain_literal(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["explain", "hello"])
+        assert result.exit_code == 0
+        assert "hello" in result.output.lower() or "letter" in result.output.lower()
+
+    def test_explain_with_flavor(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["explain", "hello", "--flavor", "python"])
+        assert result.exit_code == 0
+        assert "hello" in result.output.lower()
+
+    def test_explain_verbose(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["explain", "hello", "--verbose"])
+        assert result.exit_code == 0
+        assert "Pattern" in result.output
+
+    def test_explain_json(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["explain", "hello", "--json"])
+        assert result.exit_code == 0
+        assert "{" in result.output
+
+
+class TestGenerateCommand:
+    def test_generate_literal(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["generate", "hello"])
+        assert result.exit_code == 0
+        assert "hello" in result.output
+
+    def test_generate_with_count(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["generate", "a", "--count", "3"])
+        assert result.exit_code == 0
+
+    def test_generate_json(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["generate", "hello", "--json"])
+        assert result.exit_code == 0
+        assert "{" in result.output
+
+
+class TestFromEnglishCommand:
+    def test_from_english_basic(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["from-english", "the letter a"])
+        assert result.exit_code == 0
+
+    def test_from_english_with_flavor(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["from-english", "a digit", "--flavor", "python"])
+        assert result.exit_code == 0
+
+
+class TestFlavorsCommand:
+    def test_flavors_list(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["flavors"])
+        assert result.exit_code == 0
+        assert "pcre" in result.output
+        assert "javascript" in result.output
+
+
+class TestDetectCommand:
+    def test_detect_pattern(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ["detect", r"\d+"])
+        assert result.exit_code == 0
+        assert "flavor" in result.output.lower()