Working on adding pager.

tests/test_submission.py

@@ -94,6 +94,23 @@ def test_submission_open(submission_page, terminal):
         assert terminal.open_browser.called
 
 
+def test_submission_pager(submission_page, terminal):
+
+    # View a submission with the pager
+    with mock.patch.object(terminal, 'open_pager'):
+        submission_page.controller.trigger(terminal.RETURN)
+        assert terminal.open_browser.called
+
+    # Move down to the first comment
+    with mock.patch.object(submission_page, 'clear_input_queue'):
+        submission_page.controller.trigger('j')
+
+    # View a comment with the pager
+    with mock.patch.object(terminal, 'open_pager'):
+        submission_page.controller.trigger(terminal.RETURN)
+        assert terminal.open_browser.called
+
+
 def test_submission_vote(submission_page, refresh_token):
 
     # Log in

tests/test_terminal.py

@@ -308,4 +308,26 @@ def test_open_browser(terminal):
         terminal.open_browser(url)
     open_new_tab.assert_called_with(url)
     assert curses.endwin.called
-    assert curses.doupdate.called
+    assert curses.doupdate.called
+
+
+def test_open_pager(terminal, stdscr):
+
+    data = "Hello World!"
+
+    def side_effect(*_, stdin=None):
+        assert stdin is not None
+        raise OSError
+
+    with mock.patch('subprocess.Popen', autospec=True) as Popen, \
+            mock.patch.dict('os.environ', {'PAGER': 'fake'}):
+
+        terminal.open_pager(data)
+        assert Popen.called
+        assert not stdscr.addstr.called
+
+        # Raise an OS error
+        Popen.side_effect = side_effect
+        terminal.open_pager(data)
+        message = 'Could not open pager fake'.encode('ascii')
+        assert stdscr.addstr.called_with(0, 0, message)