Test _util.py

Tests/test_util.py

@@ -0,0 +1,80 @@
+from helper import unittest, PillowTestCase, tearDownModule
+
+from PIL import _util
+
+
+class TestUtil(PillowTestCase):
+
+    def test_is_string_type(self):
+        # Arrange
+        text = "abc"
+
+        # Act
+        it_is = _util.isStringType(text)
+
+        # Assert
+        self.assertTrue(it_is)
+
+    def test_is_not_string_type(self):
+        # Arrange
+        integer = 123
+
+        # Act
+        it_is_not = _util.isStringType(integer)
+
+        # Assert
+        self.assertFalse(it_is_not)
+
+    def test_is_path(self):
+        # Arrange
+        text = "abc"
+
+        # Act
+        it_is = _util.isStringType(text)
+
+        # Assert
+        self.assertTrue(it_is)
+
+    def test_is_not_path(self):
+        # Arrange
+        integer = 123
+
+        # Act
+        it_is_not = _util.isPath(integer)
+
+        # Assert
+        self.assertFalse(it_is_not)
+
+    def test_is_directory(self):
+        # Arrange
+        directory = "Tests"
+
+        # Act
+        it_is = _util.isDirectory(directory)
+
+        # Assert
+        self.assertTrue(it_is)
+
+    def test_is_not_directory(self):
+        # Arrange
+        text = "abc"
+
+        # Act
+        it_is_not = _util.isDirectory(text)
+
+        # Assert
+        self.assertFalse(it_is_not)
+
+    def test_deferred_error(self):
+        # Arrange
+
+        # Act
+        thing = _util.deferred_error(ValueError("Some error text"))
+
+        # Assert
+        self.assertRaises(ValueError, lambda: thing.some_attr)
+
+if __name__ == '__main__':
+    unittest.main()
+
+# End of file