fixup! Add test for working and broken symlinks

Author: matthijskooijman

Diff for: test/test_compile.py

@@ -217,9 +217,7 @@ def test_broken_symlink(sketch_name, link_name, target_name, expect_error):
         result = run_command(["compile", "-b", fqbn, sketch_path])
 
         if expect_error:
-            expected_error = "Error during build: Can't open sketch: open {}: ".format(
-                symlink_file
-            )
+            expected_error = "Error during build: Can't open sketch: open {}: ".format(symlink_file)
             assert expected_error in result.stderr
             assert not result.ok
         else: