Add test for "1 / any number" expression

[serhii73]

Fix #775

[serhii73]

@sobolevn is it a right test for #775?

[sobolevn]

Yes, it is! Thanks for asking!

[serhii73]

But why I get the error in tests/test_visitors/test_ast/conftest.py ?

[serhii73]

https://travis-ci.org/wemake-services/wemake-python-styleguide/jobs/575858697

[serhii73]

I added ipdb to code and want to understand where code return error and where need fix function.

@pytest.mark.parametrize('expression', [
    '1 / other',
    '1 / 11',
])
def test_one_to_divide(
    assert_errors,
    parse_ast_tree,
    expression,
    default_options,
):
    """Testing that `1 / any number` is the correct expression."""

    tree = parse_ast_tree(usage_template.format(expression))
    import ipdb; ipdb.set_trace()

    visitor = UselessOperatorsVisitor(default_options, tree=tree)
    visitor.run()

    assert_errors(visitor, [])

Because of the need to fix this problem - #775
But I see Syntax Error.

[sobolevn]

Try tree = parse_ast_tree(expression)

[sobolevn]

Please, also check 1 / 1. It should raise a violation because of the / 1 part

[sobolevn]

@serhii73 thanks! I will take it from here, since I am releasing 0.12.3 at the moment.

[serhii73]

You're welcome.
Sorry but I don't understand why Travis is red, but I'm very curious. Do you know? @sobolevn

[sobolevn]

See my fix: 9b3c155#diff-b9425bbc8c1b7baf877d6cbb75055e64R109

It was a mypy issue.