TestCaseProviderSniff does not detect data provider method "class::provider"

[ziegenberg]

You can share data providers between separate unit tests with:

    /**
     * Test something.
     *
     * @dataProvider \some\class\test_class::test_provider
     */
    public function test_something(){}

This generates the error message: Data provider method "\some\class\test_class::test_provider" not found.