ensure-bazel-test-targets.sh

#!/bin/bash

# Checks if all Java and Scala test files in the repository have corresponding Bazel test targets.  If not, prints the names of
# the missing ones and exits 1.
#
# Unlike gradle, Bazel does not automatically discover new test files.  This script will help us ensure that we don't
# have test files lingering that aren't being executed.

set -euo pipefail

ROOT_DIR=$(bazel info workspace)

all_test_files=$(find "$ROOT_DIR" -path '**/src/test/**/*Test.java' -or -path '**/src/e2e/**/*Test.scala' -or -path '**/src/test/**/*Test.scala' | sort)
known_test_files=$(bazel query --noshow_loading_progress 'kind("source file", filter("Test\.(java|scala)$", labels("srcs", tests(//...))))' | tr ':' '/' | sed "s=//=$ROOT_DIR/=" | sort)

if ! unknown_test_files=$(diff <(echo "$all_test_files") <(echo "$known_test_files") 2>&1)
then
    echo "ERROR: One or more test files do not have Bazel test targets, and are not executed.  Add targets for the following tests:"
    echo "$unknown_test_files"
    exit 1
else
    echo "All Java and Scala test files have Bazel test targets.  Good job!"
fi