#!/usr/bin/env bats

setup() {
  set -euo pipefail

  bats_load_library bats-support
  bats_load_library bats-assert

  DIR="$(cd "$(dirname "$BATS_TEST_FILENAME")" >/dev/null 2>&1 && pwd)"
  PATH="$DIR/../bin:$PATH"
}

@test "keeps hunk when replacement matches" {
  printf "%s\n" "foo" >"$BATS_TEST_TMPDIR/old"
  printf "%s\n" "bar" >"$BATS_TEST_TMPDIR/new"
  diff_output="$(git diff --no-index "$BATS_TEST_TMPDIR/old" \
    "$BATS_TEST_TMPDIR/new" || true)"
  run mechanicaldiff.py foo bar <<<"$diff_output"
  assert_success
  assert_output "$diff_output"
}

@test "drops diff when replacement does not match" {
  printf "%s\n" "foo" >"$BATS_TEST_TMPDIR/old"
  printf "%s\n" "baz" >"$BATS_TEST_TMPDIR/new"
  git diff --no-index "$BATS_TEST_TMPDIR/old" "$BATS_TEST_TMPDIR/new" \
    >"$BATS_TEST_TMPDIR/diff" || true
  run mechanicaldiff.py foo bar <"$BATS_TEST_TMPDIR/diff"
  assert_success
  assert_output ""
}