npm test # unit test & coverage
expect(result).toBeDefined()
expect(result).toBeGreaterThan(3)
expect(result).toBeLessThan(0)
expect(thing).toBeNaN()
expect(string).toContain(substring)
expect('my string').toMatch(/^my/)
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npm test # unit test & coverage
expect(result).toBeDefined()
expect(result).toBeGreaterThan(3)
expect(result).toBeLessThan(0)
expect(thing).toBeNaN()
expect(string).toContain(substring)
expect('my string').toMatch(/^my/)