Find Polluter

1#!/usr/bin/env bash
2# Bisection script to find which test creates unwanted files/state
3# Usage: ./find-polluter.sh <file_or_dir_to_check> <test_pattern>
4# Example: ./find-polluter.sh '.git' 'src/**/*.test.ts'
5
6set -e
7
8if [ $# -ne 2 ]; then
9  echo "Usage: $0 <file_to_check> <test_pattern>"
10  echo "Example: $0 '.git' 'src/**/*.test.ts'"
11  exit 1
12fi
13
14POLLUTION_CHECK="$1"
15TEST_PATTERN="$2"
16
17echo "🔍 Searching for test that creates: $POLLUTION_CHECK"
18echo "Test pattern: $TEST_PATTERN"
19echo ""
20
21# Get list of test files (find . emits ./-prefixed paths, so accept the
22# pattern written with or without a leading ./)
23TEST_PATTERN="${TEST_PATTERN#./}"
24# find -path can't match '**/' against zero directory levels, so a pattern
25# like src/**/*.test.ts would skip src/top.test.ts; also try the pattern
26# with '**/' collapsed to cover files directly under the base directory.
27TEST_FILES=$(find . \( -path "./$TEST_PATTERN" -o -path "./${TEST_PATTERN//\*\*\//}" \) | sort -u)
28if [ -z "$TEST_FILES" ]; then
29  TOTAL=0
30else
31  TOTAL=$(printf '%s\n' "$TEST_FILES" | wc -l | tr -d ' ')
32fi
33
34echo "Found $TOTAL test files"
35echo ""
36
37COUNT=0
38for TEST_FILE in $TEST_FILES; do
39  COUNT=$((COUNT + 1))
40
41  # Skip if pollution already exists
42  if [ -e "$POLLUTION_CHECK" ]; then
43    echo "⚠️  Pollution already exists before test $COUNT/$TOTAL"
44    echo "   Skipping: $TEST_FILE"
45    continue
46  fi
47
48  echo "[$COUNT/$TOTAL] Testing: $TEST_FILE"
49
50  # Run the test
51  npm test "$TEST_FILE" > /dev/null 2>&1 || true
52
53  # Check if pollution appeared
54  if [ -e "$POLLUTION_CHECK" ]; then
55    echo ""
56    echo "🎯 FOUND POLLUTER!"
57    echo "   Test: $TEST_FILE"
58    echo "   Created: $POLLUTION_CHECK"
59    echo ""
60    echo "Pollution details:"
61    ls -la "$POLLUTION_CHECK"
62    echo ""
63    echo "To investigate:"
64    echo "  npm test $TEST_FILE    # Run just this test"
65    echo "  cat $TEST_FILE         # Review test code"
66    exit 1
67  fi
68done
69
70echo ""
71echo "✅ No polluter found - all tests clean!"
72exit 0