microsoft / microsoft/nodejstools

Jest parameterized tests doesn't run correctly

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C#
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Description

Expected Behavior

Test Explorer should list down parameterized tests independently and run them correctly

Actual Behavior

Test explorer only shows and runs the first test and it also breaks when you try to include parameters in the test name.

  • NTVS Version: 1.5.40404.3
  • Visual Studio Version: 2022
  • Node.js Version: 16.15.1
Steps to Reproduce
  1. Create a new project using docs : https://docs.microsoft.com/en-us/visualstudio/javascript/tutorial-create-react-app?view=vs-2022
  2. In app.test.js, added a parameterized jest test.
test.each([
    [true, true],
    [false, false]
])('dummy test', (a, b) => {
    expect(a).toBe(b);
});
  1. When I build the project and open test explorer, it was expected to show two tests, but shows a single one
    image

  2. If I change the test to something which is expected to fail, like

test.each([
    [true, true],
    [false, true]
])('dummy test', (a, b) => {
    expect(a).toBe(b);
});

The test explorer shows that the test still passes, which is because it seems to only run the first test

  1. If I change the test name to be something parameterized,
test.each([
    [true, true],
    [false, false]
])('expect %p to be %p', (a, b) => {
    expect(a).toBe(b);
});

then the test fails in test explorer and test explorer doesn't show it correctly
image

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the issue from app.test.js in a Visual Studio Test Explorer project using the listed Jest parameterized cases. Start by examining how Test Explorer discovers and runs these tests; done means each parameterized case is listed and executed independently, including tests with parameterized names.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, node.js
Domain
devtools, testing-qa
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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