ilogue / niprov

        self.fileFactory.fromProvenance.side_effect = lambda p: 'img_'+p['l']

        from niprov.jsonfile import JsonFile

        repo = JsonFile(self.dependencies)

        img1 = self.imageWithProvenance({'parents':[],'l':'a'})

        img2 = self.imageWithProvenance({'parents':['x','a'],'l':'b'})

        img3 = self.imageWithProvenance({'parents':['b'],'l':'b'})

        img4 = self.imageWithProvenance({'parents':['c','y'],'l':'d'})

        img5 = self.imageWithProvenance({'parents':['d'],'l':'e'})

        repo.all = Mock()

        repo.all.return_value = [img1, img2, img3, img4, img5]

        out = repo.byParents(['x','y'])

        self.assertEqual([img2, img4], out)

    def test_Will_tell_PictureCache_to_persist_known_Snapshot(self):

        from niprov.jsonfile import JsonFile

        repo = JsonFile(self.dependencies)

        img = self.imageWithProvenance({'location':'1','foo':'baz'})

        repo.add(img)

        self.pictureCache.saveToDisk.assert_called_with(for_=img)

        self.fileFactory.fromProvenance.side_effect = lambda p: 'img_'+p['l']

        from niprov.jsonfile import JsonFile

        repo = JsonFile(self.dependencies)

        i1 = self.imageWithProvenance({'color':'red'})

        i2 = self.imageWithProvenance({'location':'redis'})

        i3 = self.imageWithProvenance({'user':'reddit'})

        i4 = self.imageWithProvenance({'subject':'red bastard'})

        i5 = self.imageWithProvenance({'protocol':'reddish'})

        i6 = self.imageWithProvenance({'transformation':'zoomed red'})

        i7 = self.imageWithProvenance({'technique':'redshift'})

        i8 = self.imageWithProvenance({'modality':'red'})

        repo.all = Mock()

        repo.all.return_value = [i1,i2,i3,i4,i5,i6,i7,i8]

        out = repo.search('red')

        self.assertNotIn(i1, out)

        self.assertIn(i2, out)

        self.assertIn(i3, out)

        self.assertIn(i4, out)