Describe plugins using .ini files, so that we don't need to import them to know their capabilities.

scikits/image/io/tests/test_plugin.py

@@ -5,55 +5,45 @@ from scikits.image.io._plugins import plugin
 
 from copy import deepcopy
 
-def read(fname, as_grey=False, dtype=None):
-    assert fname == 'test.png'
-    assert as_grey == True
-    assert dtype == 'i4'
-
-def save(fname, arr):
-    assert fname == 'test.png'
-    assert arr == [1, 2, 3]
-
-def show(arr, plugin_arg=None):
-    assert arr == [1, 2, 3]
-    assert plugin_arg == (1, 2)
-
-def show_other(arr):
-    return "other"
 
 def setup_module(self):
     self.backup_plugin_store = deepcopy(plugin.plugin_store)
-    plugin.register('testcase', read=read, save=save, show=show)
-    plugin.register('other', show=show_other)
+    plugin.load('test')
 
 def teardown_module(self):
     plugin.plugin_store = self.backup_plugin_store
 
 class TestPlugin:
     def test_read(self):
-        io.imread('test.png', as_grey=True, dtype='i4', plugin='testcase')
+        io.imread('test.png', as_grey=True, dtype='i4', plugin='test')
 
     def test_save(self):
-        io.imsave('test.png', [1, 2, 3], plugin='testcase')
+        io.imsave('test.png', [1, 2, 3], plugin='test')
 
     def test_show(self):
-        io.imshow([1, 2, 3], plugin_arg=(1, 2), plugin='testcase')
+        io.imshow([1, 2, 3], plugin_arg=(1, 2), plugin='test')
 
     def test_use(self):
-        plugin.use('other', 'show')
-        assert io.imshow(None) == 'other'
+        plugin.use('test')
+
+    @raises(RuntimeError)
+    def test_failed_use(self):
+        plugin.use('asd')
+
+    def test_use_priority(self):
+        plugin.use('pil')
+        plug, func = plugin.plugin_store['imread'][0]
+        print plugin.plugin_store
+        assert_equal(plug, 'pil')
+
+        plugin.use('test')
+        plug, func = plugin.plugin_store['imread'][0]
+        print plugin.plugin_store
+        assert_equal(plug, 'test')
 
     def test_available(self):
-        plugin.use('other', 'show')
-        d = plugin.available('show')
-        assert d['show'][0] == 'other'
-
-    def test_load(self):
-        plugin.load('test')
-        fname, arr = io.imsave('outfile', [1, 2, 3])
-        assert_equal(fname, 'outfile')
-        assert_equal(arr, [1, 2, 3])
-        assert_equal(plugin.available('save')['save'][0], 'test')
+        assert 'qt' in io.plugins()
+        assert 'test' in io.plugins(loaded=True)
 
 if __name__ == "__main__":
     run_module_suite()