Xiao Wang created JXPATH-198:
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Summary: Refactor Context to improve test logic
Key: JXPATH-198
URL: https://issues.apache.org/jira/browse/JXPATH-198
Project: Commons JXPath
Issue Type: Improvement
Reporter: Xiao Wang
h3. Description
I noticed that there is a test class
[Context|https://github.com/apache/commons-jxpath/blob/192f4c92727cf5387a8043525a1e1e1533c9ac69/src/test/java/org/apache/commons/jxpath/ri/compiler/ExtensionFunctionTest.java#L388]
implements production interface
[ExpressionContext|https://github.com/apache/commons-jxpath/blob/192f4c92727cf5387a8043525a1e1e1533c9ac69/src/main/java/org/apache/commons/jxpath/ExpressionContext.java#L45]
to assist testing [ClassFunctions.getFunction(String, String,
Object)|https://github.com/apache/commons-jxpath/blob/192f4c92727cf5387a8043525a1e1e1533c9ac69/src/main/java/org/apache/commons/jxpath/ClassFunctions.java#L91],
[ConstructorFunction.invoke(ExpressionContext,
Object[])](https://github.com/apache/commons-jxpath/blob/192f4c92727cf5387a8043525a1e1e1533c9ac69/src/main/java/org/apache/commons/jxpath/functions/ConstructorFunction.java#L52)
and [MethodFunction.invoke(ExpressionContext,
Object[])](https://github.com/apache/commons-jxpath/blob/192f4c92727cf5387a8043525a1e1e1533c9ac69/src/main/java/org/apache/commons/jxpath/functions/MethodFunction.java#L48).
This might not be the best priactice in unit testing and can be improved by
leveraging mocking frameworks.
h3. Current Implementation
* {{Context}} overrides {{getContextNodePointer()}} to control the behavior.
* {{Context}} implements {{ExpressionContext}} and implement methods to return
the default values.
* In test case, the child test class is used to assit testing by passing as a
parameter to {{Function.invoke(ExpressionContext, Object[])}}.
h3. Proposed Implementation
* Replace {{Context}} with a mocking object created by Mockito.
* Use method stub to control the behavior of {{getContextNodePointer()}}.
* Create a method to return the mocking object for reusing.
h3. Motivation
* Decouple test class {{Context}} from production interface
{{ExpressionContext}}.
* Remove the redundant test child class {{Context}}
* Remove the redundant overridden methods that return default values.
* Make testing logic more explict.
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