Implement InList and NotInList methods

[gavv]

Some matcher structs (Number, DateTime) have InRange method that checks that the value belongs to given range [min; max].

Another convenient thing would be InList method, that checks that the value equals to one of the given values a, b, c, ....

For example:

array.Element(1).String().InList("green", "red")

We need to add InList and counterpart NotInList methods to the following structs:

• Value
• Object
• Array
• String
• Number
• Boolean (just for completeness)
• Duration
• DateTime

The new methods can use assertions of type AssertBelongs and AssertNotBelongs. Please place these methods after InRange, or after Equal* if there is no InRange for this struct.

Each method should have documentation comment with code example and be covered by a unit test. It would be also nice to demonstrate usage of InRange and InList in _examples/fruits_test.go.

[fahimbagar]

Hi @gavv, I have created PR for this issue: #256

Could you check it? and let me know how it goes

PS.

1. Since AssertionList rejects a single slice as a param, single array param in InList will behave like IsEqual and NotInList will behave like NotEqual. Added in 649ee8c
   

   httpexpect/assertion_validation.go

   Lines 186 to 190 in 86f366a

   	if len(lst) == 1 && reflect.ValueOf(lst[0]).Kind() == reflect.Slice {
   	return errors.New(
   	"AssertionList should contain a list of values," +
   	" but it contains a single element which itself is a list")
   	}

2. I'll update _examples/fruits_test.go if this PR is merged. Or do you have an alternative without modifying go.mod under _examples?

[gavv]

Thanks for pr! Will take a look shortly.

Re: PS

1. Let's just remove this check from assertion validation. It was useful euristics to catch bugs, but it's not working well with InList.

2. Yes, let's update examples separately, thanks.

[fahimbagar]

Addressed in 40c6e50.

Sure, thanks for your awesome repo as well 💯

[gavv]

Reopening after auto-close because we also need to update example.

[gavv]

Created follow-up issue: #261

[gavv]

I've tagged v2.11.0, which includes InList.

[fahimbagar]

@gavv, thanks for reviewing the PR.

I'll add an example along with this issue #251 if that's okay for you.

[gavv]

Great, thanks!! Please leave a comment there so that I can assign it to you.