The utility function "isTestCase" works wrong with some situations.

[374632897]

The relative PR is #307 .
See the test case like below(referenced from no-export.test.ts):

{
  valid: [
    'describe("a test", () => { expect(1).toBe(1); })',
    'window.location = "valid"',
    'module.somethingElse = "foo";',
    'export const myThing = "valid"',
    'export default function () {}',
    'module.exports = function(){}',
    'module.exports.myThing = "valid";',
    'export const test = () => true; test("Hello");'
  ],
}

The last item of valid array declares a function named "test" and exports it. In this case, the utility function "isTestCase" makes a wrong check:

export const isTestCase = (
  node: TSESTree.CallExpression,
): node is JestFunctionCallExpression<TestCaseName> =>
  (node.callee.type === AST_NODE_TYPES.Identifier &&
    TestCaseName.hasOwnProperty(node.callee.name)) ||
  (node.callee.type === AST_NODE_TYPES.MemberExpression &&
    node.callee.property.type === AST_NODE_TYPES.Identifier &&
    TestCaseProperty.hasOwnProperty(node.callee.property.name) &&
    ((node.callee.object.type === AST_NODE_TYPES.Identifier &&
      TestCaseName.hasOwnProperty(node.callee.object.name)) ||
      (node.callee.object.type === AST_NODE_TYPES.MemberExpression &&
        node.callee.object.object.type === AST_NODE_TYPES.Identifier &&
        TestCaseName.hasOwnProperty(node.callee.object.object.name))));

Once a file has a function named "test" declared and been called in the file, the file will be marked as a test file and this makes it work wrong with the rule "jest/no-export".

[G-Rath]

This behaviour is correct: any file that is linted by eslint-plugin-jest is assumed to be a test file, as that is the kind of files this plugin is designed to lint.

We do have plans to improve our checking for the jest globals, which would most likely result in this particular case no longer being flagged, but regardless you should use overrides property in your eslint config to apply the rules from this plugin to just your test files :)