a739002cfa
Only write out the tests if the source files changed, so editors don't reload files that didn't actually change. Change-Id: Ifd8621e36aab88b6f0740881a6289bc392a0f52f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134841 Reviewed-by: Bob Nystrom <rnystrom@google.com>