feat(MED-161): add jest for service tests

jest.config.js

@@ -0,0 +1,66 @@
+import { pathsToModuleNameMapper } from 'ts-jest';
+import { readFileSync } from 'fs';
+
+const tsconfig = JSON.parse(readFileSync('./tsconfig.json', 'utf8'));
+
+/** @type {import('jest').Config} */
+export default {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  
+  // Handle module resolution for TypeScript paths
+  moduleNameMapper: {
+    ...pathsToModuleNameMapper(tsconfig.compilerOptions.paths, {
+      prefix: '<rootDir>/',
+    }),
+    // Mock problematic libraries
+    '^isikukood$': '<rootDir>/__mocks__/isikukood.ts',
+    '^server-only$': '<rootDir>/__mocks__/server-only.ts',
+  },
+  
+  // Test file patterns
+  testMatch: [
+    '**/__tests__/**/*.(ts|tsx|js)',
+    '**/*.(test|spec).(ts|tsx|js)'
+  ],
+  
+  // Setup files
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+  
+  // Coverage configuration
+  collectCoverageFrom: [
+    'lib/**/*.{ts,tsx}',
+    'app/**/*.{ts,tsx}',
+    'components/**/*.{ts,tsx}',
+    '!**/*.d.ts',
+    '!**/node_modules/**',
+    '!**/.next/**'
+  ],
+  
+  // Transform configuration
+  transform: {
+    '^.+\\.(ts|tsx)$': ['ts-jest', {
+      useESM: true,
+      tsconfig: {
+        jsx: 'react-jsx',
+      },
+    }],
+  },
+  
+  // Module file extensions
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
+  
+  // Ignore patterns
+  testPathIgnorePatterns: [
+    '<rootDir>/.next/',
+    '<rootDir>/node_modules/',
+  ],
+  
+  // Transform ignore patterns for node_modules
+  transformIgnorePatterns: [
+    'node_modules/(?!(.*\\.mjs$))',
+  ],
+  
+  // ESM support
+  extensionsToTreatAsEsm: ['.ts'],
+};