fixup! Fix: specs on windows

Author: ysbaddaden

test/runnable_test.cr

@@ -107,11 +107,9 @@ class RunnableTest < Minitest::Test
     stdout = execute("--verbose", pass: false)
     assert_match /ABCTest#test_error = [\d.]+ s = E/, stdout
     assert_match "Exception: oopsie\n", stdout
-    {% if flag?(:windows) %}
-      assert_match /test\\runnable_.+_test.cr:\d+ in 'test_error'/, stdout
-    {% else %}
-      assert_match /test\/runnable_.+_test.cr:\d+:\d+ in 'test_error'/, stdout
-    {% end %}
+
+    path = Path.new("test", "runnable").to_s
+    assert_match /#{path}_.+_test.cr:.* in 'test_error'/, stdout
   end
 
   def test_skip