Add test suite for PDF checker

- Add test script with minimal JSON fixtures
- Test 3 scenarios: no changes, newer year, URL change
- Add tests/README.md with usage instructions

Author: ironprogrammer

tests/README.md

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+# Tests
+
+## Running Tests
+
+```bash
+./tests/test-pdf-checker.sh
+```
+
+## Test Fixtures
+
+Minimal JSON fixtures in `fixtures/` test different scenarios:
+- `current-version.json` - Up-to-date version (expects no changes)
+- `old-version.json` - Older year (expects newer year detection)
+- `url-changed.json` - Same year, different URL (expects data correction detection)

tests/fixtures/current-version.json

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+{
+  "title": "2024-2025 OSI Time Standards",
+  "sourceUrl": "https://www.oregonswimming.org/wzorlsc/UserFiles/Image/QuickUpload/2024-2025-osi-time-standards-full_040221.pdf",
+  "generatedOn": "2025-10-24",
+  "ageGroups": []
+}

tests/fixtures/old-version.json

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+{
+  "title": "2023-2024 OSI Time Standards",
+  "sourceUrl": "https://www.oregonswimming.org/wzorlsc/UserFiles/Image/QuickUpload/2023-2024-osi-time-standards-full_040221.pdf",
+  "generatedOn": "2024-10-24",
+  "ageGroups": []
+}

tests/fixtures/url-changed.json

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+{
+  "title": "2024-2025 OSI Time Standards",
+  "sourceUrl": "https://www.oregonswimming.org/wzorlsc/UserFiles/Image/QuickUpload/2024-2025-osi-time-standards-OLD.pdf",
+  "generatedOn": "2025-10-24",
+  "ageGroups": []
+}

tests/test-pdf-checker.sh

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+#!/bin/bash
+
+# Test script for check-for-new-pdf.js
+# Uses minimal test fixtures to verify behavior
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+CHECK_SCRIPT="$PROJECT_ROOT/.github/scripts/check-for-new-pdf.js"
+FIXTURES_DIR="$SCRIPT_DIR/fixtures"
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+echo -e "${BLUE}================================================${NC}"
+echo -e "${BLUE}Testing PDF Checker Script${NC}"
+echo -e "${BLUE}================================================${NC}"
+echo ""
+
+# Function to run test
+run_test() {
+    local test_name="$1"
+    local fixture_file="$2"
+    local expected_exit_code="$3"
+
+    echo -e "${BLUE}------------------------------------------------${NC}"
+    echo -e "${BLUE}Test: $test_name${NC}"
+    echo -e "${BLUE}Fixture: $(basename "$fixture_file")${NC}"
+    echo -e "${BLUE}------------------------------------------------${NC}"
+
+    # Run the script with the fixture file and capture exit code
+    set +e
+    node "$CHECK_SCRIPT" "$fixture_file"
+    actual_exit_code=$?
+    set -e
+
+    echo ""
+
+    # Verify exit code
+    if [ $actual_exit_code -eq $expected_exit_code ]; then
+        echo -e "${GREEN}✓ PASSED${NC} - Exit code: $actual_exit_code (expected: $expected_exit_code)"
+    else
+        echo -e "${RED}✗ FAILED${NC} - Exit code: $actual_exit_code (expected: $expected_exit_code)"
+        exit 1
+    fi
+
+    echo ""
+}
+
+# Test 1: No changes (current version is up to date)
+run_test "No changes - Current version up to date" \
+    "$FIXTURES_DIR/current-version.json" \
+    1
+
+# Test 2: Newer year detected
+run_test "Newer year detected (2023-2024 → 2024-2025)" \
+    "$FIXTURES_DIR/old-version.json" \
+    0
+
+# Test 3: URL changed for same year
+run_test "URL changed for same year (data correction)" \
+    "$FIXTURES_DIR/url-changed.json" \
+    0
+
+# Summary
+echo -e "${GREEN}================================================${NC}"
+echo -e "${GREEN}All tests passed!${NC}"
+echo -e "${GREEN}================================================${NC}"