This directory contains: - .yaml files These contain test cases for endtoend_cli_test.go, in the directory above. They typically show a command to run, the directory to run it in (relative to test-filesystem), the files that the command should create, and a transcript of a debugging session that can follow from that command. endtoend_cli_test.go runs the commands, responds to prompts as specified in the transcript, and verifies that godebug behaves as it describes. - test-filesystem/ This is the working directory where endtoend_cli_test.go runs its tests. The test sets GOPATH=test-filesystem/gopath:$GOPATH before running. - single-file-tests/ See the README in that directory. It contains similar test files, used by endtoend_test.go.