refactor: Split topic_command_cb and add tests

Split out the parts of topic_command_cb that's most interesting and
easiest to test into parse_topic_command and add tests for that
function.

1 files changed, 44 insertions, 0 deletions

diff --git a/_pytest/test_topic_command.py b/_pytest/test_topic_command.py
new file mode 100644
index 0000000..2a4f069
--- /dev/null
+++ b/_pytest/test_topic_command.py
@@ -0,0 +1,44 @@
+from wee_slack import parse_topic_command
+
+
+def test_parse_topic_without_arguments():
+    channel_name, topic = parse_topic_command('/topic')
+
+    assert channel_name is None
+    assert topic is None
+
+
+def test_parse_topic_with_text():
+    channel_name, topic = parse_topic_command('/topic some topic text')
+
+    assert channel_name is None
+    assert topic == 'some topic text'
+
+
+def test_parse_topic_with_delete():
+    channel_name, topic = parse_topic_command('/topic -delete')
+
+    assert channel_name is None
+    assert topic == ''
+
+
+def test_parse_topic_with_channel():
+    channel_name, topic = parse_topic_command('/topic #general')
+
+    assert channel_name == 'general'
+    assert topic is None
+
+
+def test_parse_topic_with_channel_and_text():
+    channel_name, topic = parse_topic_command(
+        '/topic #general some topic text')
+
+    assert channel_name == 'general'
+    assert topic == 'some topic text'
+
+
+def test_parse_topic_with_channel_and_delete():
+    channel_name, topic = parse_topic_command('/topic #general -delete')
+
+    assert channel_name == 'general'
+    assert topic == ''