Generics

[corbym]

v.1.1.0 - generics

Changes all the matchers to use generics instead of reflection. Some still use a bit of reflection, e.g. TypeName etc.

Other major changes:

• ValueContaining has been split into StringContaining, MapContaining, MapContainingValues, MapMatchingValues, ArrayContaining and ArrayMatching.
• No longer panics with unknown types, as types will fail at compile time.

Some idiosyncrasies with the generic types do exist, but this is language specific;

• map matchers generally need to know the type of the map key values explicitly or the compiler will complain, e.g.
  then.AssertThat(testing, map[string]bool{"hi": true, "bye": true}, has.AllKeys[string, bool]("hi", "bye"))
• has.Length() is likewise pernickety about types being explicit, mainly because it works on both strings and arrays. It needs to know both the type of the array and the array/string type. Confused? me too.
• is.LessThan and is.GreaterThan no longer work on complex types. This is because the complex types do not support the comparison operators (yet, somehow, they could be compared by reflection 🤷 )

See the matcher_test.go file for full usage.

[coveralls]

Coverage: 100.0%. Remained the same when pulling 4ea9cb6 on generics into 38dfeaf on master.