feat: add satisfy alias

[Shinigami92]

In Faker we want to use expect(...).to* assertions so we have consistent tests for everything.

Examples:

expect(...).toBe
expect(...).toContain
expect(...).toMatch
expect(...).toSatisfy

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[antfu]

Can you add a simple test for it? Thanks

[Shinigami92]

Can you add a simple test for it? Thanks

@antfu done ✅

[fardolieri]

To me it seems like toSatisfy never even calls the given function and always results in a passing test. I wrote two test cases that show what I mean.

+ import { vi } from 'vitest'

describe.only('toSatisfy()',() => {
  const isOdd = (value: number) => value % 2 !== 0

  it('pass with 0',() => {
    expect(1).toSatisfy(isOdd)
  })

  it('pass with negotiation',() => {
    expect(2).not.toSatisfy(isOdd)
  })
+
+  it('calls the function',() => {
+    const isOddMock = vi.fn(isOdd)
+    expect(isOddMock).not.toBeCalled()
+    expect(1).toSatisfy(isOddMock)
+    expect(isOddMock).toBeCalled()
+  })
+
+  it('fails when not satisfied',() => {
+    const shouldFailFn = () => expect(2).toSatisfy(isOdd)
+    expect(shouldFailFn).toThrow()
+  })
})

[fardolieri]

Here's a reproduction link
https://stackblitz.com/edit/vitest-dev-vitest-yap1ev?file=test/basic.test.ts

Do you want me to open an issue?

[Shinigami92]

Here's a reproduction link stackblitz.com/edit/vitest-dev-vitest-yap1ev?file=test/basic.test.ts

Do you want me to open an issue?

You could also directly open a PR 🙂

[ST-DDT]

@fardolieri : I created a PR with a fix: #1350

[fardolieri]

Awesome, thanks for stepping in!