feat: Create ErrorHandler to convert errors to Representations

test/unit/util/errors/ErrorUtil.test.ts

@@ -0,0 +1,34 @@
+import { assertNativeError, getStatusCode, isNativeError } from '../../../../src/util/errors/ErrorUtil';
+import { NotFoundHttpError } from '../../../../src/util/errors/NotFoundHttpError';
+
+describe('ErrorUtil', (): void => {
+  describe('#isNativeError', (): void => {
+    it('returns true on native errors.', async(): Promise<void> => {
+      expect(isNativeError(new Error('error'))).toBe(true);
+    });
+
+    it('returns false on other values.', async(): Promise<void> => {
+      expect(isNativeError('apple')).toBe(false);
+    });
+  });
+
+  describe('#assertNativeError', (): void => {
+    it('returns undefined on native errors.', async(): Promise<void> => {
+      expect(assertNativeError(new Error('error'))).toBeUndefined();
+    });
+
+    it('throws on other values.', async(): Promise<void> => {
+      expect((): void => assertNativeError('apple')).toThrow('apple');
+    });
+  });
+
+  describe('#getStatusCode', (): void => {
+    it('returns the corresponding status code for HttpErrors.', async(): Promise<void> => {
+      expect(getStatusCode(new NotFoundHttpError())).toBe(404);
+    });
+
+    it('returns 500 for other errors.', async(): Promise<void> => {
+      expect(getStatusCode(new Error('404'))).toBe(500);
+    });
+  });
+});