feat - testActionSnapshot should unpack all the actions recursively

[MariaAga]

I'm submitting a…

• Regression (a behavior that used to work and stopped working in a new release)
• Bug report
• Feature request
• Documentation issue or request
• Support request

Expected Behavior

testActionSnapshot should unpack all the actions recursively

react-redux-test-utils/src/unit-test-helpers.js

Line 121 in 2a30775

expect(dispatch.mock.calls).toMatchSnapshot();

one of the calls could be also a function and should be called again
results in snapshot containing this:
Array [ [Function], ],

Steps to Reproduce (for bugs)

have a few actions that call more actions using dispatch