Basic Examples (1) 

Evaluate an expression using a mocked version of the function f:

In[1]:=

Out[1]=

Scope (2) 

Use MockDefinitionGroup to specify multiple, potentially interconnected definitions:

In[2]:=

Out[3]=

By default, MockDefinition shields against recursive invocation, so a mock definition for a function can call the same function's original definition without danger of infinite recursion:

In[4]:=

Out[5]=

In[6]:=

Out[6]=

Applications (3) 

Create a mocked version of URLExecute for testing the UKPostcodeLookup resource function. The mock definition validates the URL in an HTTP request and returns a canned response without actually making the request:

In[7]:=

This mocked version can be used to validate the request-construction and response-parsing logic in the function under test without the expense of making live HTTP requests:

In[8]:=

Out[9]=

In[10]:=

Out[10]=

The use of ConfirmBy in the mock definition causes the evaluation to exit early and return a Failure object if the requested URL is incorrect:

In[11]:=

Out[11]=

In[12]:=

Out[12]=