Add end-to-end test for nomie->loop

tests/test_cli.py

@@ -1,15 +1,46 @@
-import click.testing
+from click.testing import CliRunner
 import pytest
 
+# for integration tests
+from pathlib import Path
+from shutil import copyfile
+from subprocess import run
+
 from habitmove import cli
 
 
 @pytest.fixture
 def runner():
-    return click.testing.CliRunner()
+    return CliRunner()
+
+
+# Create an isolated environment to test the output file in
+@pytest.fixture
+def runner_with_nomie_input(tmp_path):
+    runner = CliRunner()
+    fname_input_data = Path("tests/data/nomie/input.json").resolve()
+    fname_target_data = Path("tests/data/loop/output.db").resolve()
+    with runner.isolated_filesystem(temp_dir=tmp_path):
+        copyfile(fname_input_data.resolve(), f"input.json")
+        copyfile(fname_target_data.resolve(), f"target")
+        yield runner
 
 
 def test_cli_fails_without_file(runner):
     result = runner.invoke(cli.main)
     assert result.exit_code == 2
     assert "Missing argument" in result.output
+
+
+@pytest.mark.e2e
+def test_produces_output_file(runner_with_nomie_input):
+    result = runner_with_nomie_input.invoke(cli.main, "input.json")
+    assert result.exit_code == 0
+    assert Path("output.db").exists()
+
+
+@pytest.mark.e2e
+def test_produces_correct_output(runner_with_nomie_input):
+    runner_with_nomie_input.invoke(cli.main, "input.json")
+    result = run(["sqldiff", "output.db", "target"], capture_output=True)
+    assert result.stdout == b""