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add Len matcher #368

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merged 1 commit into from Dec 23, 2019
Merged

add Len matcher #368

merged 1 commit into from Dec 23, 2019

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codyoss
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@codyoss codyoss commented Dec 20, 2019

This matcher will check the length with any type that allows this
behavior via reflection. Implementation inspired by #189.

This matcher will check the length with any type that allows this
behavior via reflection. Implementation inspired by #189.
func (m lenMatcher) Matches(x interface{}) bool {
v := reflect.ValueOf(x)
switch v.Kind() {
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String:
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curious, does this cover *[]string and []string ?

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This would not, do you think we should support that?

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I don't think it's necessarily needed. If it supports []string but not *[]string the user can just dereference.

@@ -192,6 +210,12 @@ func Any() Matcher { return anyMatcher{} }
// Eq(5).Matches(4) // returns false
func Eq(x interface{}) Matcher { return eqMatcher{x} }

// Len returns a matcher that matches on length. This matcher returns false if
// is compared to a type that is not an array, chan, map, slice, or string.
func Len(i int) Matcher {
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nit: I'm imagining mockFoo.EXPECT().Bar(gomock.Len(4)) which feels like it could be more natural but I can't think of a better alternative.

@codyoss codyoss merged commit b4b7d21 into golang:master Dec 23, 2019
@codyoss codyoss deleted the len-matcher branch December 23, 2019 16:01
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2 participants