Tests break after upgrade to jest 20.0.0 from 19.0.2

[presidenten]

Running jest 20.0.0, fresh node_modules and --no-cache

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
Tests run fine and show correct behaviour with jest 19.0.2, but break in 20.0.0.
Running test with fit or it.only makes the test pass again.

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

git clone https://github.com/presidenten/vuex-plus.git
cd vuex-plus
yarn

 node_modules/.bin/jest --config=.jestrc.json --no-cache src/api/map.spec.js
# "should return local getters" test passes

yarn upgrade jest@^20.0.0 babel-jest@^20.0.0
node_modules/.bin/jest --config=.jestrc.json --no-cache src/api/map.spec.js
#  get same issue as https://github.com/facebook/jest/issues/3499

nano .jestrc.json
# change "<rootDir>/src/**/?(*.)(spec).js?(x)" to "**/?(*.)(spec).js?(x)", save & exit

node_modules/.bin/jest --config=.jestrc.json --no-cache src/api/map.spec.js
# "should return local getters" test fails

nano +57 src/api/map.spec.js
# change `it` to `fit`, save & exit

 node_modules/.bin/jest --config=.jestrc.json --no-cache src/api/map.spec.js
# "should return local getters" test passes

What is the expected behavior?
Tests passing in 19.0.2 should continue to work in 20.0.0, also running tests with or without fit should not make a difference to whether the test passes or not.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.
Jest config:

{
  "bail": true,
  "testMatch": [
    "<rootDir>/src/**/?(*.)(spec).js?(x)"
  ],
  "moduleFileExtensions": [
    "js",
    "json",
    "vue"
  ],
  "clearMocks": true,
  "resetMocks": true,
  "resetModules": true
}

node version 6.9.1
yarn version 0.17.10
osx 10.12.4

[thymikee]

Looks like a regression after rewriting our Jasmine bindings.
As a workaround for now, don't use this in your tests or reset the values. It currently gets shared between functions in the same describe block, so your this.instance = 'bar' set in first test is preserved in a following one, where you assume it to be empty (that's why it pass as a single test).

[presidenten]

Rewriting the tests to pass an object to xyz.call() instead of passing this, solved the problem.

[thymikee]

Closing, we'll discuss this in relevant PR.

[github-actions]

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