Test array view index

[markrogoyski]

This adds unit tests for ArrayView indexing.

Note: No tests were added for floats. I presumed floats should not work and would throw an exception, but they work and return values. I recommend clearly defining what the behavior for floats should be and add unit tests to document this.

For reference in Python:

>>> [1, 2, 3][1.5]
<stdin>:1: SyntaxWarning: list indices must be integers or slices, not float; perhaps you missed a comma?
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers or slices, not float

Also, it was not clear what the distinction between KeyError and IndexError is. The unit tests assert what is currently being thrown.

[coveralls]

Pull Request Test Coverage Report for Build 8226732251

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+3.6%) to 79.29%

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Totals
Change from base Build 8224384536:	3.6%
Covered Lines:	134
Relevant Lines:	169

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💛 - Coveralls

[Smoren]

Thank you for your PR! I merged it.