add smoketest for CLI

tests/test_cli.py

@@ -0,0 +1,29 @@
+import subprocess
+
+
+def test_smometest():
+    output = subprocess.check_output(["amqtt", "--help"])
+    assert b"Usage" in output
+    assert b"aMQTT" in output
+
+    output = subprocess.check_output(["amqtt_sub", "--help"])
+    assert b"Usage" in output
+    assert b"amqtt_sub" in output
+
+    output = subprocess.check_output(["amqtt_pub", "--help"])
+    assert b"Usage" in output
+    assert b"amqtt_pub" in output
+
+
+def test_smometest_legacy():
+    output = subprocess.check_output(["hbmqtt", "--help"])
+    assert b"Usage" in output
+    assert b"aMQTT" in output
+
+    output = subprocess.check_output(["hbmqtt_sub", "--help"])
+    assert b"Usage" in output
+    assert b"amqtt_sub" in output
+
+    output = subprocess.check_output(["hbmqtt_pub", "--help"])
+    assert b"Usage" in output
+    assert b"amqtt_pub" in output