print `image_url` if it exists (#504)

* print `image_url` if it exists

* add test for image_url

* requirements.txt for pytest

* fix requirements.txt

* text before image_url

* this isn’t required

* README readability for development section

thanks @trygveaa

* README reorder for this development section

4 files changed, 28 insertions, 2 deletions

diff --git a/README.md b/README.md
index 999f40f..4115414 100644
--- a/README.md
+++ b/README.md
@@ -288,10 +288,13 @@ Show channel name in hotlist after activity
 /set weechat.look.hotlist_names_level 14
 ```
 
-Debugging
---------------
+Development
+-----------------
+
+To run the tests, create a virtualenv and pip install from the `requirements.txt`. Then `pytest` to run them locally.
 
 Enable debug mode and change debug level (default 3, decrease to increase logging and vice versa):
+
 ```
 /set plugins.var.python.slack.debug_mode on
 /set plugins.var.python.slack.debug_level 2
diff --git a/_pytest/test_unwrap_attachments.py b/_pytest/test_unwrap_attachments.py
index ee5bd8b..0839613 100644
--- a/_pytest/test_unwrap_attachments.py
+++ b/_pytest/test_unwrap_attachments.py
@@ -32,6 +32,21 @@ import pytest
         'input_message': {'attachments': [{
             'title': 'Title',
             'text': 'Attachment text',
+            'title_link': 'http://title.link',
+            'image_url': 'http://image.url',
+            'fallback': 'Fallback',
+        }]},
+        'input_text_before': "",
+        'output': "\n".join([
+            "Title (http://title.link)",
+            "Attachment text",
+            "http://image.url",
+        ]),
+    },
+    {
+        'input_message': {'attachments': [{
+            'title': 'Title',
+            'text': 'Attachment text',
             'title_link': 'http://link?a=1&b=2',
             'from_url': 'http://link?a=1&b=2',
         }]},
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..d0d67bc
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+pytest
+mock
+websocket-client
diff --git a/wee_slack.py b/wee_slack.py
index 9262e7f..dae13b0 100644
--- a/wee_slack.py
+++ b/wee_slack.py
@@ -2812,6 +2812,11 @@ def unwrap_attachments(message_json, text_before):
                 tx = re.sub(r' *\n[\n ]+', '\n', atext)
                 t.append(prepend_title_text + tx)
                 prepend_title_text = ''
+
+            image_url = attachment.get('image_url', '')
+            if image_url not in text_before_unescaped and image_url != title_link:
+                t.append(image_url)
+
             fields = attachment.get("fields", None)
             if fields:
                 for f in fields: