General: Add initial test.

tests/test_util.py

@@ -0,0 +1,54 @@
+"""Test util functions."""
+import unittest
+import pathlib
+from pywal import util
+
+
+class TestUtil(unittest.TestCase):
+    """Test the util functions."""
+
+    def test_read_file_start(self):
+        """Test read_file()."""
+        result = util.read_file("tests/test_file")
+        self.assertEqual(result[0], "#363442")
+
+    def test_read_file_end(self):
+        """Test read_file()."""
+        result = util.read_file("tests/test_file")
+        self.assertEqual(result[15], "#C9CFD0")
+
+    def test_save_file(self):
+        """Test save_file()."""
+        tmp_file = pathlib.Path("/tmp/test_file")
+        util.save_file("Hello, world", tmp_file)
+        result = tmp_file.is_file()
+        self.assertTrue(result)
+
+    def test_create_dir(self):
+        """Test create_dir()."""
+        tmp_dir = pathlib.Path("/tmp/test_dir")
+        util.create_dir(tmp_dir)
+        result = tmp_dir.is_dir()
+        self.assertTrue(result)
+
+    def test_hex_to_rgb_black(self):
+        """Test hex_to_rgb() on #000000."""
+        result = util.hex_to_rgb("#000000")
+        self.assertEqual(result, "0,0,0")
+
+    def test_hex_to_rgb_white(self):
+        """Test hex_to_rgb() on #FFFFFF."""
+        result = util.hex_to_rgb("#FFFFFF")
+        self.assertEqual(result, "255,255,255")
+
+    def test_hex_to_rgb_rand(self):
+        """Test hex_to_rgb() on #98AEC2."""
+        result = util.hex_to_rgb("#98AEC2")
+        self.assertEqual(result, "152,174,194")
+
+    # Figure out how to test this.
+    # def test_disown(self):
+
+
+if __name__ == "__main__":
+    unittest.main()