Add tests for image handlers

IPython/frontend/terminal/console/tests/test_image_handler.py

@@ -0,0 +1,94 b''
+#-----------------------------------------------------------------------------
+# Copyright (C) 2012 The IPython Development Team
+#
+# Distributed under the terms of the BSD License. The full license is in
+# the file COPYING, distributed as part of this software.
+#-----------------------------------------------------------------------------
+
+import os
+import unittest
+import base64
+
+from IPython.zmq.kernelmanager import KernelManager
+from IPython.frontend.terminal.console.interactiveshell \
+    import ZMQTerminalInteractiveShell
+from IPython.utils.tempdir import NamedFileInTemporaryDirectory
+from IPython.testing.tools import monkeypatch
+from IPython.utils.ipstruct import Struct
+from IPython.utils.process import find_cmd
+
+
+SCRIPT_PATH = os.path.join(
+    os.path.abspath(os.path.dirname(__file__)), 'writetofile.py')
+
+
+class ZMQTerminalInteractiveShellTestCase(unittest.TestCase):
+
+    def setUp(self):
+        km = KernelManager()
+        self.shell = ZMQTerminalInteractiveShell(kernel_manager=km)
+        self.raw = b'dummy data'
+        self.mime = 'image/png'
+        self.data = {self.mime: base64.encodestring(self.raw)}
+
+    def test_no_call_by_default(self):
+        def raise_if_called(*args, **kwds):
+            assert False
+
+        shell = self.shell
+        shell.handle_image_PIL
+        shell.handle_image_stream
+        shell.handle_image_tempfile
+        shell.handle_image_callable
+
+        shell.handle_image(None, None)  # arguments are dummy
+
+    def test_handle_image_PIL(self):
+        import PIL.Image
+
+        open_called_with = []
+        show_called_with = []
+
+        def fake_open(arg):
+            open_called_with.append(arg)
+            return Struct(show=lambda: show_called_with.append(None))
+
+        with monkeypatch(PIL.Image, 'open', fake_open):
+            self.shell.handle_image_PIL(self.data, self.mime)
+
+        assert len(open_called_with) == 1
+        assert len(show_called_with) == 1
+        assert open_called_with[0].getvalue() == self.raw
+
+    @staticmethod
+    def get_handler_command(inpath, outpath):
+        return [find_cmd('python'), SCRIPT_PATH, inpath, outpath]
+
+    def check_handler_with_file(self, inpath, handler):
+        shell = self.shell
+        configname = '{0}_image_handler'.format(handler)
+        funcname = 'handle_image_{0}'.format(handler)
+
+        assert hasattr(shell, configname)
+        assert hasattr(shell, funcname)
+
+        with NamedFileInTemporaryDirectory('data') as file:
+            cmd = self.get_handler_command(inpath, file.name)
+            setattr(shell, configname, cmd)
+            getattr(shell, funcname)(self.data, self.mime)
+            transferred = file.read()
+
+        assert transferred == self.raw
+
+    def test_handle_image_stream(self):
+        self.check_handler_with_file('-', 'stream')
+
+    def test_handle_image_tempfile(self):
+        self.check_handler_with_file('{file}', 'tempfile')
+
+    def test_handle_image_callable(self):
+        called_with = []
+        self.shell.callable_image_handler = called_with.append
+        self.shell.handle_image_callable(self.data, self.mime)
+        assert len(called_with) == 1
+        assert called_with[0] is self.data

IPython/frontend/terminal/console/tests/writetofile.py

@@ -0,0 +1,20 b''
+#-----------------------------------------------------------------------------
+# Copyright (C) 2012 The IPython Development Team
+#
+# Distributed under the terms of the BSD License. The full license is in
+# the file COPYING, distributed as part of this software.
+#-----------------------------------------------------------------------------
+
+"""
+Copy data from input file to output file for testing.
+"""
+
+import sys
+(inpath, outpath) = sys.argv[1:]
+
+if inpath == '-':
+    infile = sys.stdin
+else:
+    infile = open(inpath)
+
+open(outpath, 'w+b').write(infile.read())