teleport/build.assets/tooling/cmd/difftest

difftest

This tool finds tests which were changed since a previous git revision.

Usage

To see changes:

difftest diff --path . --branch master

To get go test flags to run only newly appeared tests:

difftest test --path . --branch master --exclude-updates

How it works

1. Calls git diff $(git merge-base --fork-point <branch>)
2. Filters all added/modified files ending with _test.go.
3. Builds a map of Test* methods in every file.
4. Calculates SHA1 hash of each method body.
5. Does the same for the counterpart files at the fork point.
6. Compares the results. If a method was not there previously, it's marked as new. If a method's contents was changed, it is marked as changed.

testify/suite support

1. Tool detects suite start signatures like the following:

       func TestSingleSuite(t *testing.T) { suite.Run(t, &SingleSuite{}) }
   

   where suite references to testify/suite package, and t references testing package.

2. All methods related to a single suite must be in the same package (directory).

3. All suite parts must redside in a files matching *_test.go pattern.

4. If a test method has a receiver, which was not detected as a testify/suite previously, such method got skipped.