diff --git a/tests/integration/test_cli.py b/tests/integration/test_cli.py
new file mode 100644
index 0000000..dbf70ee
--- /dev/null
+++ b/tests/integration/test_cli.py
@@ -0,0 +1,121 @@
+"""Integration tests for the CLI."""
+
+import json
+import tempfile
+from pathlib import Path
+
+import pytest
+from click.testing import CliRunner
+
+from envschema.cli import cli
+
+
+class TestValidateCommand:
+    """Tests for the validate command."""
+
+    def test_validate_missing_schema(self):
+        runner = CliRunner()
+        result = runner.invoke(cli, ["validate", "/nonexistent/schema.json"])
+        assert result.exit_code == 2
+
+    def test_validate_empty_env(self, tmp_path):
+        schema_file = tmp_path / "schema.json"
+        schema_file.write_text(json.dumps({
+            "version": "1.0",
+            "envVars": []
+        }))
+        runner = CliRunner()
+        result = runner.invoke(cli, ["validate", str(schema_file)])
+        assert result.exit_code == 0
+
+    def test_validate_missing_required(self, tmp_path):
+        schema_file = tmp_path / "schema.json"
+        schema_file.write_text(json.dumps({
+            "version": "1.0",
+            "envVars": [
+                {"name": "REQUIRED_VAR", "required": True}
+            ]
+        }))
+        runner = CliRunner()
+        result = runner.invoke(cli, ["validate", str(schema_file), "--no-env"])
+        assert result.exit_code == 1
+        assert "REQUIRED_VAR" in result.output
+
+    def test_validate_with_valid_env(self, tmp_path):
+        schema_file = tmp_path / "schema.json"
+        schema_file.write_text(json.dumps({
+            "version": "1.0",
+            "envVars": [
+                {"name": "TEST_VAR", "type": "str", "required": True}
+            ]
+        }))
+        env_file = tmp_path / ".env"
+        env_file.write_text("TEST_VAR=value\n")
+        runner = CliRunner()
+        result = runner.invoke(cli, ["validate", str(schema_file), "--file", str(env_file), "--no-env"])
+        assert result.exit_code == 0
+
+    def test_validate_json_output(self, tmp_path):
+        schema_file = tmp_path / "schema.json"
+        schema_file.write_text(json.dumps({
+            "version": "1.0",
+            "envVars": []
+        }))
+        runner = CliRunner()
+        result = runner.invoke(cli, ["validate", str(schema_file), "--format", "json"])
+        assert result.exit_code == 0
+        data = json.loads(result.output)
+        assert data["is_valid"] is True
+
+
+class TestGenerateCommand:
+    """Tests for the generate command."""
+
+    def test_generate_empty_schema(self, tmp_path):
+        schema_file = tmp_path / "schema.json"
+        schema_file.write_text(json.dumps({
+            "version": "1.0",
+            "envVars": []
+        }))
+        runner = CliRunner()
+        result = runner.invoke(cli, ["generate", str(schema_file)])
+        assert result.exit_code == 0
+
+    def test_generate_with_vars(self, tmp_path):
+        schema_file = tmp_path / "schema.json"
+        schema_file.write_text(json.dumps({
+            "version": "1.0",
+            "envVars": [
+                {"name": "TEST_VAR", "description": "A test variable"},
+                {"name": "REQUIRED_VAR", "required": True}
+            ]
+        }))
+        output_file = tmp_path / ".env.example"
+        runner = CliRunner()
+        result = runner.invoke(cli, ["generate", str(schema_file), "--output", str(output_file)])
+        assert result.exit_code == 0
+        content = output_file.read_text()
+        assert "TEST_VAR=" in content
+        assert "# REQUIRED" in content
+
+
+class TestCheckCommand:
+    """Tests for the check command."""
+
+    def test_check_valid_schema(self, tmp_path):
+        schema_file = tmp_path / "schema.json"
+        schema_file.write_text(json.dumps({
+            "version": "1.0",
+            "envVars": [
+                {"name": "TEST_VAR", "type": "str"}
+            ]
+        }))
+        runner = CliRunner()
+        result = runner.invoke(cli, ["check", str(schema_file)])
+        assert result.exit_code == 0
+        assert "Schema is valid" in result.output
+
+    def test_check_missing_file(self):
+        runner = CliRunner()
+        result = runner.invoke(cli, ["check", "/nonexistent/schema.json"])
+        assert result.exit_code == 2
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