Add test case to reproduce issue #70 - file duplication and extension misreporting

Co-authored-by: GrantBirki <23362539+GrantBirki@users.noreply.github.com>

Author: Copilot

__tests__/test-bug-reproduction.test.js

@@ -0,0 +1,61 @@
+import {jsonValidator} from '../src/functions/json-validator'
+import {yamlValidator} from '../src/functions/yaml-validator'
+import {Exclude} from '../src/functions/exclude'
+
+const originalEnv = process.env
+
+beforeEach(() => {
+  jest.clearAllMocks()
+  process.env = {...originalEnv}
+  
+  // Set default environment variables
+  process.env.INPUT_BASE_DIR = '.'
+  process.env.INPUT_JSON_EXTENSION = '.json'
+  process.env.INPUT_JSON_EXCLUDE_REGEX = ''
+  process.env.INPUT_JSON_SCHEMA = ''
+  process.env.INPUT_YAML_EXTENSION = '.yaml'
+  process.env.INPUT_YAML_EXTENSION_SHORT = '.yml'
+  process.env.INPUT_YAML_EXCLUDE_REGEX = ''
+  process.env.INPUT_YAML_SCHEMA = ''
+  process.env.INPUT_YAML_AS_JSON = 'false'
+  process.env.INPUT_USE_DOT_MATCH = 'true'
+  process.env.INPUT_ALLOW_MULTIPLE_DOCUMENTS = 'false'
+  process.env.INPUT_USE_GITIGNORE = 'false'
+  process.env.INPUT_EXCLUDE_FILE = ''
+  process.env.INPUT_EXCLUDE_FILE_REQUIRED = 'false'
+  process.env.INPUT_GIT_IGNORE_PATH = '.gitignore'
+  process.env.INPUT_AJV_STRICT_MODE = 'true'
+  process.env.INPUT_JSON_SCHEMA_VERSION = 'draft-07'
+  process.env.INPUT_USE_AJV_FORMATS = 'false'
+})
+
+afterEach(() => {
+  process.env = originalEnv
+})
+
+describe('file duplication and extension issue reproduction', () => {
+  test('reproduces the issue from bug report #70', async () => {
+    // Setup the scenario from the issue using test fixtures
+    process.env.INPUT_FILES = '__tests__/fixtures/json/valid/json1.json\n__tests__/fixtures/yaml/valid/yaml1.yaml'
+    
+    const excludeMock = new Exclude()
+    
+    // Run both validators like in main.js
+    const jsonResults = await jsonValidator(excludeMock)
+    const yamlResults = await yamlValidator(excludeMock)
+    
+    // Expectations based on the correct behavior
+    // JSON validator should process only the .json file
+    expect(jsonResults.passed).toBe(1)
+    expect(jsonResults.failed).toBe(0)
+    expect(jsonResults.skipped).toBe(0)
+    
+    // YAML validator should process only the .yaml file  
+    expect(yamlResults.passed).toBe(1)
+    expect(yamlResults.failed).toBe(0)
+    expect(yamlResults.skipped).toBe(0)
+    
+    console.log('JSON Results:', jsonResults)
+    console.log('YAML Results:', yamlResults)
+  })
+})