diff --git a/tests/test_integration.py b/tests/test_integration.py
new file mode 100644
index 0000000..07574b8
--- /dev/null
+++ b/tests/test_integration.py
@@ -0,0 +1,113 @@
+"""End-to-end integration tests for cmdparse CLI."""
+
+from click.testing import CliRunner
+
+from cmdparse.cli import main
+
+
+class TestCLI:
+    def test_parse_table_to_json(self):
+        runner = CliRunner()
+        input_text = """NAME    IMAGE    STATUS
+ nginx   nginx:1   running
+ redis   redis:3   stopped"""
+        result = runner.invoke(main, ['-o', 'json', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'nginx' in result.output
+
+    def test_parse_key_value_to_yaml(self):
+        runner = CliRunner()
+        input_text = """name: John
+ age: 30
+ city: NYC"""
+        result = runner.invoke(main, ['-o', 'yaml', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'John' in result.output
+        assert 'name' in result.output
+
+    def test_parse_csv_to_csv(self):
+        runner = CliRunner()
+        input_text = """name,age,city
+ John,30,NYC"""
+        result = runner.invoke(main, ['-o', 'csv', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'John' in result.output
+        assert 'Jane' in result.output
+
+    def test_field_extraction(self):
+        runner = CliRunner()
+        input_text = """NAME    IMAGE    STATUS
+ nginx   nginx:1   running
+ redis   redis:3   stopped"""
+        result = runner.invoke(main, ['-o', 'json', '-q', '-e', 'NAME', '-e', 'STATUS'],
+                              input=input_text)
+        assert result.exit_code == 0
+        output = result.output
+        assert 'nginx' in output
+        assert 'running' in output
+
+    def test_no_input_error(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ['-q'], input='')
+        assert result.exit_code == 1
+        assert 'error' in result.output.lower() or 'input' in result.output.lower()
+
+    def test_auto_format_detection(self):
+        runner = CliRunner()
+        input_text = """name: John
+ age: 30"""
+        result = runner.invoke(main, ['-f', 'auto', '-o', 'json', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'John' in result.output
+
+    def test_help_option(self):
+        runner = CliRunner()
+        result = runner.invoke(main, ['--help'])
+        assert result.exit_code == 0
+        assert '--output' in result.output
+        assert '--field' in result.output
+        assert '--config' in result.output
+
+    def test_parse_raw_text(self):
+        runner = CliRunner()
+        input_text = """Some random text line 1
+ Another line here
+ Third line"""
+        result = runner.invoke(main, ['-o', 'json', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'line' in result.output.lower() or '1' in result.output
+
+    def test_parse_delimited_semicolon(self):
+        runner = CliRunner()
+        input_text = """name;age;city
+ John;30;NYC"""
+        result = runner.invoke(main, ['-o', 'json', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'John' in result.output
+
+
+class TestIntegrationScenarios:
+    def test_docker_ps_style_output(self):
+        runner = CliRunner()
+        input_text = """CONTAINER ID   IMAGE         COMMAND    CREATED   STATUS   PORTS   NAMES
+ abc123        nginx:1       "nginx"    1h ago    Up       80/tcp  nginx"""
+        result = runner.invoke(main, ['-o', 'json', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'nginx' in result.output
+
+    def test_df_style_output(self):
+        runner = CliRunner()
+        input_text = """Filesystem      Size  Used Avail Use% Mounted on
+ /dev/sda1       100G   50G   50G  50% /"""
+        result = runner.invoke(main, ['-o', 'json', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert '/dev/sda1' in result.output
+
+    def test_key_value_with_special_chars(self):
+        runner = CliRunner()
+        input_text = """DATABASE_URL=postgresql://user:pass@localhost:5432/db
+ API_KEY=abc123xyz
+ DEBUG=true"""
+        result = runner.invoke(main, ['-o', 'yaml', '-q'], input=input_text)
+        assert result.exit_code == 0
+        assert 'DATABASE_URL' in result.output