tests: Add formatter test

tests/test_formatter.py

@@ -0,0 +1,47 @@
+# test_formatter.py
+#
+# Copyright 2021 James Westman <james@jwestman.net>
+#
+# This file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation; either version 3 of the
+# License, or (at your option) any later version.
+#
+# This file is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+
+import difflib
+import unittest
+from pathlib import Path
+
+from blueprintcompiler.formatter import Format
+
+
+class TestFormatter(unittest.TestCase):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.maxDiff = None
+
+    def assert_format_test(self, input_file, expected_file):
+        print("assert_format_test({}, {})".format(input_file, expected_file))
+        with open((Path(__file__).parent / f"formatting/{input_file}").resolve()) as f:
+            input_data = f.read()
+        with open(
+            (Path(__file__).parent / f"formatting/{expected_file}").resolve()
+        ) as f:
+            expected = f.read()
+
+        actual = Format.format(input_data)
+        self.assertEqual(actual, expected)
+
+    def test_formatter(self):
+        self.assert_format_test("in1.blp", "out.blp")
+        self.assert_format_test("in2.blp", "out.blp")