Tests for CollateralToken and ERC20

[kelvintyb]

Description

Add specs for CollateralToken and ERC20

Checklist

• Linter status: 100% pass
• Changes don't break existing behavior
• Tests coverage hasn't decreased

Refers/Fixes

Fixes: #3
Fixes: #4

[eswarasai]

@kelvintyb -- Any update on this? Let me know if you need any help in case you're stuck. Also looks like there are some conflicts. Please do rebase your branch with that of upstream:develop and try to resolve the conflicts and commit the changes. Thanks!

[kelvintyb]

Thanks @eswarasai, will reach out if I get stuck, this week is looking busy at work, but I will be able to work on this more over the weekend. Sorry about the delay!

[eswarasai]

@kelvintyb -- Sure. No problem. Let us know once it's ready for review. Thanks :)

[kelvintyb]

WIP update: Added more tests for methods on CollateralToken, and adjusted variables tests.

[eswarasai]

@kelvintyb -- Thanks for the update. Let us know when the PR is ready for the review. Also please do rebase your branch with upstream:develop before passing onto review.

[kelvintyb]

@eswarasai rebased my branch on the latest upstream:develop; PR is ready for review.

[coveralls]

Pull Request Test Coverage Report for Build 48

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.9%) to 92.086%

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Totals
Change from base Build 47:	0.9%
Covered Lines:	236
Relevant Lines:	258

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💛 - Coveralls

[eswarasai]

@kelvintyb -- Can you please remove the methods test cases being duplicated in variables test cases for CollateralToken.test.ts? Example -- has approve, has transfer methods. Thanks!

[kelvintyb]

Yep, done :)

[eswarasai]

LGTM!

[eswarasai]

@kelvintyb -- I've just merged the PR. Just a heads up on the other issue you'd be tackling. So the methods approveTx, balanceOf should be under methods instead of variables test cases.