Mock all transformers in ETL chain to a single Mock
Im working on an ETL app where the ETL chain is maintained in Spring beans. Something like:
<bean id="extractor" children="t1" /> <bean id="t1" children="t2" /> <bean id="t2" children="t3" /> <bean id="t3" children=null /> And the classes look like:
class Transformer { Transformer [] children = [Transformer with secret S2] String secret = "S1"; public doSomething() { } } Class Transformer { Transformer [] children = [Transformer with secret S3] String secret = "S2"; public doSomething() { } } Class Transformer { Transformer [] children = null; String secret = "S3"; public doSomething() { } } And the extractor looks like:
class Extractor { public transform(Transformer n) { n.doSomething(); for(Transformer c: n.children) { extractor(c); } } } Transformers have database related data and hence would like to mock them. One option is the duplicate the Spring bean etl chain with mocked transformers but I dont like duplication. Plus it would hard to maintain. I also dont want a separate mock for each Transformer.
I have access to the real instance of Extractor but once extractor() starts, I would like to mock doSomething() of all instances of Transformer.
Is this possible?
