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437071b948
* assert: rename and refactor TestContainsFailMessage
I've renamed it to TestContainsNotContains and added a test case
structure so that I can use this test to validate the failure messages
from both Contains and NotContains,
There are no functional changes here, strictly refactoring. A new test
case will be added in a subsequent change.
* assert: fix error message formatting for NotContains
It was using "%s" to format the s and contains arguments, but these
could be any type that supports iteration such as a map. In this case
of NotContains failing against a map, it would print something like:
"map[one:%!s(int=1)]" should not contain "one"
Fix this using "%#v" as was already done for Contains and added test
cases covering both the "len()" / iterable failure messages as well as
the Contains/NotContains failure case.
The new message for this example map would be something like:
map[string]int{"one":1} should not contain "one"