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// A test that uses a mock.
package user_test
import (
"testing"
"go.uber.org/mock/gomock"
user "go.uber.org/mock/sample"
"go.uber.org/mock/sample/imp1"
imp_four "go.uber.org/mock/sample/imp4"
)
func TestRemember(t *testing.T) {
ctrl := gomock.NewController(t)
mockIndex := NewMockIndex(ctrl)
mockIndex.EXPECT().Put("a", 1) // literals work
mockIndex.EXPECT().Put("b", gomock.Eq(2)) // matchers work too
// NillableRet returns error. Not declaring it should result in a nil return.
mockIndex.EXPECT().NillableRet()
// Calls that returns something assignable to the return type.
boolc := make(chan bool)
// In this case, "chan bool" is assignable to "chan<- bool".
mockIndex.EXPECT().ConcreteRet().Return(boolc)
// In this case, nil is assignable to "chan<- bool".
mockIndex.EXPECT().ConcreteRet().Return(nil)
// Should be able to place expectations on variadic methods.
mockIndex.EXPECT().Ellip("%d", 0, 1, 1, 2, 3) // direct args
tri := []any{1, 3, 6, 10, 15}
mockIndex.EXPECT().Ellip("%d", tri...) // args from slice
mockIndex.EXPECT().EllipOnly(gomock.Eq("arg"))
user.Remember(mockIndex, []string{"a", "b"}, []any{1, 2})
// Check the ConcreteRet calls.
if c := mockIndex.ConcreteRet(); c != boolc {
t.Errorf("ConcreteRet: got %v, want %v", c, boolc)
}
if c := mockIndex.ConcreteRet(); c != nil {
t.Errorf("ConcreteRet: got %v, want nil", c)
}
// Try one with an action.
calledString := ""
mockIndex.EXPECT().Put(gomock.Any(), gomock.Any()).Do(func(key string, _ any) {
calledString = key
})
mockIndex.EXPECT().NillableRet()
user.Remember(mockIndex, []string{"blah"}, []any{7})
if calledString != "blah" {
t.Fatalf(`Uh oh. %q != "blah"`, calledString)
}
// Use Do with a nil arg.
mockIndex.EXPECT().Put("nil-key", gomock.Any()).Do(func(key string, value any) {
if value != nil {
t.Errorf("Put did not pass through nil; got %v", value)
}
})
mockIndex.EXPECT().NillableRet()
user.Remember(mockIndex, []string{"nil-key"}, []any{nil})
}
func TestVariadicFunction(t *testing.T) {
ctrl := gomock.NewController(t)
mockIndex := NewMockIndex(ctrl)
mockIndex.EXPECT().Ellip("%d", 5, 6, 7, 8).Do(func(format string, nums ...int) {
sum := 0
for _, value := range nums {
sum += value
}
if sum != 26 {
t.Errorf("Expected 26, got %d", sum)
}
})
mockIndex.EXPECT().Ellip("%d", gomock.Any()).Do(func(format string, nums ...int) {
sum := 0
for _, value := range nums {
sum += value
}
if sum != 10 {
t.Errorf("Expected 10, got %d", sum)
}
})
mockIndex.EXPECT().Ellip("%d", gomock.Any()).Do(func(format string, nums ...int) {
sum := 0
for _, value := range nums {
sum += value
}
if sum != 0 {
t.Errorf("Expected 0, got %d", sum)
}
})
mockIndex.EXPECT().Ellip("%d", gomock.Any()).Do(func(format string, nums ...int) {
sum := 0
for _, value := range nums {
sum += value
}
if sum != 0 {
t.Errorf("Expected 0, got %d", sum)
}
})
mockIndex.EXPECT().Ellip("%d").Do(func(format string, nums ...int) {
sum := 0
for _, value := range nums {
sum += value
}
if sum != 0 {
t.Errorf("Expected 0, got %d", sum)
}
})
mockIndex.Ellip("%d", 1, 2, 3, 4) // Match second matcher.
mockIndex.Ellip("%d", 5, 6, 7, 8) // Match first matcher.
mockIndex.Ellip("%d", 0)
mockIndex.Ellip("%d")
mockIndex.Ellip("%d")
}
func TestGrabPointer(t *testing.T) {
ctrl := gomock.NewController(t)
mockIndex := NewMockIndex(ctrl)
mockIndex.EXPECT().Ptr(gomock.Any()).SetArg(0, 7) // set first argument to 7
i := user.GrabPointer(mockIndex)
if i != 7 {
t.Errorf("Expected 7, got %d", i)
}
}
func TestEmbeddedInterface(t *testing.T) {
ctrl := gomock.NewController(t)
mockEmbed := NewMockEmbed(ctrl)
mockEmbed.EXPECT().RegularMethod()
mockEmbed.EXPECT().EmbeddedMethod()
mockEmbed.EXPECT().ForeignEmbeddedMethod()
mockEmbed.RegularMethod()
mockEmbed.EmbeddedMethod()
var emb imp1.ForeignEmbedded = mockEmbed // also does interface check
emb.ForeignEmbeddedMethod()
}
func TestExpectTrueNil(t *testing.T) {
// Make sure that passing "nil" to EXPECT (thus as a nil interface value),
// will correctly match a nil concrete type.
ctrl := gomock.NewController(t)
mockIndex := NewMockIndex(ctrl)
mockIndex.EXPECT().Ptr(nil) // this nil is a nil any
mockIndex.Ptr(nil) // this nil is a nil *int
}
func TestDoAndReturnSignature(t *testing.T) {
t.Run("wrong number of return args", func(t *testing.T) {
ctrl := gomock.NewController(t)
mockIndex := NewMockIndex(ctrl)
mockIndex.EXPECT().Slice(gomock.Any(), gomock.Any()).DoAndReturn(
func(_ []int, _ []byte) {},
)
defer func() {
if r := recover(); r == nil {
t.Error("expected panic")
}
}()
mockIndex.Slice([]int{0}, []byte("meow"))
})
t.Run("wrong type of return arg", func(t *testing.T) {
ctrl := gomock.NewController(t)
mockIndex := NewMockIndex(ctrl)
mockIndex.EXPECT().Slice(gomock.Any(), gomock.Any()).DoAndReturn(
func(_ []int, _ []byte) bool {
return true
})
mockIndex.Slice([]int{0}, []byte("meow"))
})
}
func TestExpectCondForeignFour(t *testing.T) {
ctrl := gomock.NewController(t)
defer ctrl.Finish()
mockIndex := NewMockIndex(ctrl)
mockIndex.EXPECT().ForeignFour(gomock.Cond(func(x imp_four.Imp4) bool {
return x.Field == "Cool"
}))
mockIndex.ForeignFour(imp_four.Imp4{Field: "Cool"})
}
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