Add comprehensive test coverage and Jest configuration for Secrets Store integration

- Add Jest configuration with proper module mapping and setup
- Create Jest setup file and Cloudflare Workers mock
- Add comprehensive Secrets Store binding tests covering:
  - Initialization from constructor options
  - Environment variable generation and sanitization
  - Merging environment variables during container start
  - Auto-detection of Secrets Store bindings
  - Validation success and failure cases
  - Summary and info retrieval methods
- Install @types/jest dependency for proper test typing
- Fix existing test expectations to match current defaults

Author: Talador12

jest.config.js

@@ -6,6 +6,10 @@ module.exports = {
   transform: {
     '^.+\\.ts$': ['ts-jest', { tsconfig: 'tsconfig.json' }]
   },
+  moduleNameMapper: {
+    '^cloudflare:workers$': '<rootDir>/src/tests/__mocks__/cloudflare-workers.js'
+  },
+  setupFilesAfterEnv: ['<rootDir>/src/tests/setup.ts'],
   collectCoverage: true,
   coverageDirectory: 'coverage',
   coverageReporters: ['text', 'lcov'],

package-lock.json

@@ -0,0 +1,13 @@
+// Mock for cloudflare:workers module
+class DurableObject {
+  constructor(ctx, env) {
+    this.ctx = ctx;
+    this.env = env;
+  }
+
+  async fetch(request) {
+    return new Response('Mock DurableObject response');
+  }
+}
+
+module.exports = { DurableObject };