fix: duplicate error message (#47)

src/utils/getStatusDetails.test.ts

@@ -0,0 +1,130 @@
+import { getStatusDetails } from './getStatusDetails';
+
+describe('getStatusDetails', () => {
+  it('should return undefined for falsy input', () => {
+    expect(getStatusDetails(null)).toBeUndefined();
+    expect(getStatusDetails(void 0)).toBeUndefined();
+    expect(getStatusDetails('')).toBeUndefined();
+    expect(getStatusDetails(0)).toBeUndefined();
+    expect(getStatusDetails(false)).toBeUndefined();
+  });
+
+  it('should handle string input', () => {
+    const input = 'Test error message';
+    expect(getStatusDetails(input)).toEqual({ message: input });
+  });
+
+  it('should handle Error object with stack trace', () => {
+    const error = new Error('Test error');
+    const result = getStatusDetails(error);
+    expect(result).toHaveProperty('message');
+    expect(result?.message).toContain('Test error');
+    expect(result).toHaveProperty('trace');
+    expect(result?.trace).toContain('at ');
+  });
+
+  it('should not duplicate error message if it starts with empty line', () => {
+    const error = new Error('  \nERROR:\nExpected: 5\nActual: 4');
+    const message = getStatusDetails(error)!.message!;
+    expect(message.indexOf('Expected: 5')).toBeGreaterThan(0);
+    expect(message.lastIndexOf('Expected: 5')).toBe(message.indexOf('Expected: 5'));
+  });
+
+  it('should handle Error object without stack trace', () => {
+    const error = new Error('Test error');
+    Object.defineProperty(error, 'stack', { value: undefined });
+    const result = getStatusDetails(error);
+    expect(result).toEqual({ message: 'Error: Test error' });
+  });
+
+  it('should handle custom error objects', () => {
+    class CustomError extends Error {
+      constructor(message: string) {
+        super(message);
+        this.name = 'CustomError';
+      }
+    }
+    const error = new CustomError('Custom error message');
+    const result = getStatusDetails(error);
+    expect(result).toHaveProperty('message');
+    expect(result?.message).toContain('Custom error message');
+    expect(result).toHaveProperty('trace');
+    expect(result?.trace).toContain('at ');
+  });
+
+  it('should handle non-Error objects', () => {
+    const input = { message: 'Custom error object' };
+    const result = getStatusDetails(input);
+    expect(result).toEqual({ message: 'Custom error object' });
+  });
+
+  it('should handle Error with empty message', () => {
+    // eslint-disable-next-line unicorn/error-message
+    const error = new Error();
+    const result = getStatusDetails(error);
+    expect(result).toHaveProperty('message');
+    expect(result?.message).toBeTruthy();
+    expect(result).toHaveProperty('trace');
+    expect(result?.trace).toContain('at ');
+  });
+
+  it('should handle Error with multiline message', () => {
+    const error = new Error('Line 1\nLine 2\nLine 3');
+    const result = getStatusDetails(error);
+    expect(result).toHaveProperty('message');
+    expect(result?.message).toContain('Line 1\nLine 2\nLine 3');
+    expect(result).toHaveProperty('trace');
+    expect(result?.trace).toContain('at ');
+  });
+
+  it('should handle Error with very long message', () => {
+    const longMessage = 'a'.repeat(10_000);
+    const error = new Error(longMessage);
+    const result = getStatusDetails(error);
+    expect(result).toHaveProperty('message');
+    expect(result?.message).toContain(longMessage);
+    expect(result).toHaveProperty('trace');
+    expect(result?.trace).toContain('at ');
+  });
+
+  it('should handle Error with non-string properties', () => {
+    const error: any = new Error('Test error');
+    error.code = 404;
+    error.details = { foo: 'bar' };
+    const result = getStatusDetails(error);
+    expect(result).toHaveProperty('message');
+    expect(result?.message).toContain('Test error');
+    expect(result).toHaveProperty('trace');
+    expect(result?.trace).toContain('at ');
+  });
+
+  it('should handle thrown string', () => {
+    let result;
+    try {
+      throw 'Thrown string';
+    } catch (error) {
+      result = getStatusDetails(error);
+    }
+    expect(result).toEqual({ message: 'Thrown string' });
+  });
+
+  it('should handle thrown number', () => {
+    let result;
+    try {
+      throw 404;
+    } catch (error) {
+      result = getStatusDetails(error);
+    }
+    expect(result).toEqual({ message: '404' });
+  });
+
+  it('should handle thrown object', () => {
+    let result;
+    try {
+      throw { code: 'NETWORK_ERROR', details: 'Connection refused' };
+    } catch (error) {
+      result = getStatusDetails(error);
+    }
+    expect(result).toEqual({ message: '{"code":"NETWORK_ERROR","details":"Connection refused"}' });
+  });
+});

src/utils/getStatusDetails.ts

@@ -3,6 +3,8 @@ import type { StatusDetails } from 'jest-allure2-reporter';
 import { autoIndent } from './autoIndent';
 import { isError } from './vendor';
 
+const HAS_EMPTY_FIRST_LINE = /^\s*\n/;
+
 export function getStatusDetails(maybeError: unknown): StatusDetails | undefined {
   if (!maybeError) {
     return;
@@ -35,7 +37,7 @@ function getTrace(maybeError: unknown): string {
 
 function restoreStack(error: Error): string {
   const { message, name, stack } = error;
-  if (stack && message && hasEmptyFirstLine(stack)) {
+  if (stack && message && hasEmptyFirstLine(stack) && !HAS_EMPTY_FIRST_LINE.test(message)) {
     return `${name}: ${message}${stack.slice(stack.indexOf('\n'))}`;
   }