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Testing Number Type Validation Utility in OpenHands

This test suite validates the isNumber utility function in the OpenHands frontend application. It verifies the function’s ability to correctly identify both numeric values and string representations of numbers, ensuring robust type checking functionality across the application.

Test Coverage Overview

The test suite provides comprehensive coverage for the isNumber utility function, examining both integer and string inputs.

Tests positive integer values (1)
Validates zero handling (0)
Verifies string number parsing (‘3’)
Checks string zero handling (‘0’)

Implementation Analysis

The testing approach utilizes Vitest’s straightforward assertion syntax to validate type checking behavior. The implementation follows a clear pattern of testing both primitive numbers and their string representations, leveraging Jest-like expect statements for assertions.

The test structure demonstrates the use of modern TypeScript testing patterns with clean, concise test cases.

Technical Details

Testing Infrastructure:

Framework: Vitest
Language: TypeScript
Test Runner: Vitest CLI
Assertion Style: Jest-compatible expect statements
File Organization: Follows __tests__ directory convention

Best Practices Demonstrated

The test suite exemplifies several testing best practices including atomic test cases and clear test descriptions. It demonstrates efficient test organization with focused assertions and proper isolation of the utility function under test.

Single responsibility principle in test design
Consistent assertion patterns
Clear test case organization
Proper type checking validation

all-hands-ai/openhands

frontend/__tests__/utils/is-number.test.ts

            
import { test, expect } from "vitest";
import { isNumber } from "../../src/utils/is-number";

test("isNumber", () => {
  expect(isNumber(1)).toBe(true);
  expect(isNumber(0)).toBe(true);
  expect(isNumber("3")).toBe(true);
  expect(isNumber("0")).toBe(true);
});