Test code extraction for exercises with separate file for test cases

[meoconbatu]

Fixes #80

This commit also supports arbitrary test data variable name when test function includes multiple assignments.

Recreate the PR from @junedev suggestion in #105 (comment)

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[junedev]

After these changes, the tests for the conditionals testdata exercise don't compile anymore. It would be great if that could be fixed so go run . testrunner/testdata/concept/conditionals outdir works again. This command is mentioned in the readme so it makes sense it works. Having a runnable example (not only a unit test) also helps double checking the output is correct.

Maybe it would be best you work on a copy of the exercise in a folder called separate_cases_file. Then the current conditionals test data could stay as is and for your new folder/exercise we could even add an entry in integration_test.go to make sure the "end2end" output is as expected. (The tests are more like regression/snapshot tests. To set one up, print the "got" result of the test to the console and paste it into a file in the "expected" folder, given it looks correct of course.)

[junedev]

@ErikSchierboom This should be good to go. I will do some more testing but would be good if you can stamp it.

[ErikSchierboom]

Stamped :)

[coveralls]

Pull Request Test Coverage Report for Build 6526488725

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 39 of 79 (49.37%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-3.0%) to 62.878%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
testrunner/ast.go	38	78	48.72%

Totals
Change from base Build 5829675059:	-3.0%
Covered Lines:	437
Relevant Lines:	695

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💛 - Coveralls