$ ick test-rules
testing...
  failing_test: F FAIL

DETAILS
--------------------------------------------------------------------------------
testing failing_test with main:

'foo.md' (modified) differs
--- a/foo.md
+++ b/foo.md
@@ -1 +1 @@
-RIGHT
+WRONG


(exit status: 1)
$ cat tests/failing_test/main/output/foo.md
RIGHT
$ ick test-rules --update
testing...
  failing_test: U UPDATED
1 test(s) updated
$ cat tests/failing_test/main/output/foo.md
WRONG
$ ick test-rules
testing...
  failing_test: . PASS
