Fixed toHaveProperty returning false positives when looking for undefined property

[SixTfour]

Summary

Fix false positives when looking for undefined prop. {a:{}}.hasProperty('b', undefined) now returns false.

More info can be found here.

Fixes #8786

Test plan

Used commented test on line 1380 in packages/expect/src/__tests__/matchers.test.js.

// Input:
[{a: {}}, 'a.b', undefined], // wait until Jest 25
  ].forEach(([obj, keyPath, value]) => {
    test(`{pass: false} expect(${stringify(
      obj,
    )}).toHaveProperty('${keyPath}', ${stringify(value)})`, () => {
      expect(() =>
        jestExpect(obj).toHaveProperty(keyPath, value),
      ).toThrowErrorMatchingSnapshot();
      jestExpect(obj).not.toHaveProperty(keyPath, value);
    });
  });

// Output:
exports[`.toHaveProperty() {pass: false} expect({"a": {}}).toHaveProperty('a.b', undefined) 1`] = `
"<dim>expect(</><red>object</><dim>).toHaveProperty(</><green>path</><dim>, </><green>value</><dim>)</>

Expected the object:
  <red>{\\"a\\": {}}</>
To have a nested property:
  <green>\\"a.b\\"</>
With a value of:
  <green>undefined</>
Received:
  <red>object</>.a: <red>{}</>"
`;

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[codecov-io]

Codecov Report

Merging #8923 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8923      +/-   ##
==========================================
- Coverage   64.29%   64.28%   -0.01%     
==========================================
  Files         276      276              
  Lines       11707    11702       -5     
  Branches     2864     2863       -1     
==========================================
- Hits         7527     7523       -4     
  Misses       3549     3549              
+ Partials      631      630       -1

Impacted Files	Coverage Δ
packages/expect/src/matchers.ts	97.16% <100%> (+0.29%)	⬆️
packages/expect/src/utils.ts	94.87% <100%> (ø)	⬆️

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[sklaus64]

Output now reflects new output format:

"<dim>expect(</><red>received</><dim>).</>toHaveProperty<dim>(</><green>path</><dim>, </><green>value</><dim>)</>

Expected path: <green>\\"a.b\\"</>
Received path: <red>\\"a\\"</>

Expected value: <green>undefined</>
Received value: <red>{}</>"

[SimenB]

Thank you! I'll leave this for @pedrottimark as he's the master of expect, but it LGTM 🙂

[pedrottimark]

Thank you. I need to take a more careful look at the new endPropIsDefined property, to make sure that we will be able to convert getPath function from recursive to iterative as a future chore.

[SixTfour]

Whoops. Forgot to take out that comment in matchers.test.js. Just fixed both of those issues. Thanks for taking a look at it @SimenB and @pedrottimark!

[pedrottimark]

@SimenB Is this an example of breaking change that we are postponing until Jest 26 milestone to maximize the number of people who can get the perf improvements in Jest 25?

[SimenB]

@pedrottimark yea, I think so

[SimenB]

@pedrottimark is this good to go you think?

[SimenB]

@SixTfour would you be up for rebasing this? 🙂

[cpojer]

@SixTfour sorry for the long wait here. Would you mind rebasing this PR one more time?

[SimenB]

thanks!

sorry about the delay 😅

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