Add basic set of CLI tests

tests/test_cli.py

@@ -0,0 +1,87 @@
+"""
+CLI testing, dawg.
+"""
+import json
+import subprocess
+import pytest
+
+
+def run(cmd):
+    """Run cmd and check for zero return code.
+    """
+    cp = subprocess.run(cmd.split())
+    cp.check_returncode()
+    return cp
+
+
+def verify_keys(tickers, quotes_dict):
+    """Verify all ticker names are keys in ``quotes_dict``.
+    """
+    for key, quote in quotes_dict.items():
+        assert key in tickers
+
+
+@pytest.fixture
+def nyse_tickers():
+    """List of well known NYSE ticker symbols.
+    """
+    return ('TD', 'CRON', 'TSLA', 'AAPL')
+
+
+def test_known_quotes(capfd, nyse_tickers):
+    """Verify quotes are dumped to the console as json.
+    """
+    run(f"piker quote {' '.join(nyse_tickers)}")
+
+    # verify output can be parsed as json
+    out, err = capfd.readouterr()
+    quotes_dict = json.loads(out)
+    verify_keys(nyse_tickers, quotes_dict)
+
+
+@pytest.mark.parametrize(
+    'multiple_tickers',
+    [True, False]
+)
+def test_quotes_ticker_not_found(
+    capfd, caplog, nyse_tickers, multiple_tickers
+):
+    """Verify that if a ticker can't be found it's quote value is
+    ``None`` and a warning log message is emitted to the console.
+    """
+    bad_ticker = ('doggy',)
+    tickers = bad_ticker + nyse_tickers if multiple_tickers else bad_ticker
+
+    run(f"piker quote {' '.join(tickers)}")
+
+    out, err = capfd.readouterr()
+    if out:
+        # verify output can be parsed as json
+        quotes_dict = json.loads(out)
+        verify_keys(tickers, quotes_dict)
+        # check for warning log message when some quotes are found
+        warnmsg = f'Could not find symbol {bad_ticker[0]}'
+        assert warnmsg in err
+    else:
+        # when no quotes are found we should get an error message
+        errmsg = f'No quotes could be found for {bad_ticker}'
+        assert errmsg in err
+
+
+def test_api_method(nyse_tickers, capfd):
+    """Ensure a low level api method can be called via CLI.
+    """
+    run(f"piker api quotes symbols={','.join(nyse_tickers)}")
+    out, err = capfd.readouterr()
+    quotes_dict = json.loads(out)
+    assert isinstance(quotes_dict, dict)
+
+
+def test_api_method_not_found(nyse_tickers, capfd):
+    """Ensure an error messages is printed when an API method isn't found.
+    """
+    bad_meth = 'doggy'
+    run(f"piker api {bad_meth} names={' '.join(nyse_tickers)}")
+    out, err = capfd.readouterr()
+    assert 'null' in out
+    assert f'No api method `{bad_meth}` could be found?' in err