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.

[github-actions]

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[junedev]

@meoconbatu I didn't have time to review this so far and now that I was back from vacation it seems I can't reopen the PR. 🤔

[meoconbatu]

@junedev do you have any updates?

[junedev]

@meoconbatu GitHub seems to suggest the branch you wanted to merge no longer exists. I cannot re-open the PR, the button is disabled. If you still have the code somewhere, maybe you can create a new PR.

[coveralls]

Pull Request Test Coverage Report for Build 5495932850

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

• 61 of 75 (81.33%) changed or added relevant lines in 2 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+1.2%) to 67.052%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
testrunner/ast.go	60	74	81.08%

Files with Coverage Reduction	New Missed Lines	%
testrunner/ast.go	3	77.15%

Totals
Change from base Build 5467785147:	1.2%
Covered Lines:	464
Relevant Lines:	692

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 5495932850

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

• 61 of 75 (81.33%) changed or added relevant lines in 2 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+1.2%) to 67.052%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
testrunner/ast.go	60	74	81.08%

Files with Coverage Reduction	New Missed Lines	%
testrunner/ast.go	3	77.15%

Totals
Change from base Build 5467785147:	1.2%
Covered Lines:	464
Relevant Lines:	692

---

💛 - Coveralls