test: add currency tests with float ether input

[e3243eric]

What was wrong?

Issue #102

How was it fixed?

Add float inputs to see that from_wei(to_wei(value, 'ether'), 'ether') == decimal.Decimal(str(value)) for float inputs. When the decimal of the value is less than 0 Wei, to_wei converts it to 0, and the test case gets AssertionError because of 0 != 0.0...01.

To-Do

• [x] Clean up commit history

• [x] Add entry to the release notes

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[e3243eric]

Hi @pipermerriam, can you help to review the issue? I add some float tests for the currency. Thanks!

[e3243eric]

Thanks for @fselmo pointing it out. I split up the test cases.

[fselmo]

Thanks again @e3243eric!