Spock data driven testing with interactions (Mocks)

You can do data driven testing with Mocks and interactions, the key is that your interaction should be in the setup: block For Example

    @Unroll
    def "createOtherField test to see if label override works #fieldName override(#fieldLabel) == #resultName"() {
        setup:
        FormFieldMapManager formFieldMapManager = Mock()
        String onlineFormId = '1'
        List<LabelValue> otherFields = []
        1*formFieldMapManager.getMappedFields(onlineFormId, false) >> [new FormFieldMap()]

        expect:
        List<LabelValue> result = ProcessorUtil.createOtherField(formFieldMapManager, onlineFormId, otherFields, fieldName, 'fieldValue')
        result[0].label == resultName

        where:
        fieldName   | fieldLabel    || resultName
        'fieldName' | null          || 'fieldName'
        'fieldName' | ''            || 'fieldName'
        ''          | null          || ''
        'fieldName' | 'OVERRIDE'    || 'OVERRIDE'
    }