How to use formatGottenArg method of gomock Package

...282		for i, m := range c.args {283			if !m.Matches(args[i]) {284				return fmt.Errorf(285					"expected call at %s doesn't match the argument at index %d.\nGot: %v\nWant: %v",286					c.origin, i, formatGottenArg(m, args[i]), m,287				)288			}289		}290	} else {291		if len(c.args) < c.methodType.NumIn()-1 {292			return fmt.Errorf("expected call at %s has the wrong number of matchers. Got: %d, want: %d",293				c.origin, len(c.args), c.methodType.NumIn()-1)294		}295		if len(c.args) != c.methodType.NumIn() && len(args) != len(c.args) {296			return fmt.Errorf("expected call at %s has the wrong number of arguments. Got: %d, want: %d",297				c.origin, len(args), len(c.args))298		}299		if len(args) < len(c.args)-1 {300			return fmt.Errorf("expected call at %s has the wrong number of arguments. Got: %d, want: greater than or equal to %d",301				c.origin, len(args), len(c.args)-1)302		}303		for i, m := range c.args {304			if i < c.methodType.NumIn()-1 {305				// Non-variadic args306				if !m.Matches(args[i]) {307					return fmt.Errorf("expected call at %s doesn't match the argument at index %s.\nGot: %v\nWant: %v",308						c.origin, strconv.Itoa(i), formatGottenArg(m, args[i]), m)309				}310				continue311			}312			// The last arg has a possibility of a variadic argument, so let it branch313			// sample: Foo(a int, b int, c ...int)314			if i < len(c.args) && i < len(args) {315				if m.Matches(args[i]) {316					// Got Foo(a, b, c) want Foo(matcherA, matcherB, gomock.Any())317					// Got Foo(a, b, c) want Foo(matcherA, matcherB, someSliceMatcher)318					// Got Foo(a, b, c) want Foo(matcherA, matcherB, matcherC)319					// Got Foo(a, b) want Foo(matcherA, matcherB)320					// Got Foo(a, b, c, d) want Foo(matcherA, matcherB, matcherC, matcherD)321					continue322				}323			}324			// The number of actual args don't match the number of matchers,325			// or the last matcher is a slice and the last arg is not.326			// If this function still matches it is because the last matcher327			// matches all the remaining arguments or the lack of any.328			// Convert the remaining arguments, if any, into a slice of the329			// expected type.330			vArgsType := c.methodType.In(c.methodType.NumIn() - 1)331			vArgs := reflect.MakeSlice(vArgsType, 0, len(args)-i)332			for _, arg := range args[i:] {333				vArgs = reflect.Append(vArgs, reflect.ValueOf(arg))334			}335			if m.Matches(vArgs.Interface()) {336				// Got Foo(a, b, c, d, e) want Foo(matcherA, matcherB, gomock.Any())337				// Got Foo(a, b, c, d, e) want Foo(matcherA, matcherB, someSliceMatcher)338				// Got Foo(a, b) want Foo(matcherA, matcherB, gomock.Any())339				// Got Foo(a, b) want Foo(matcherA, matcherB, someEmptySliceMatcher)340				break341			}342			// Wrong number of matchers or not match. Fail.343			// Got Foo(a, b) want Foo(matcherA, matcherB, matcherC, matcherD)344			// Got Foo(a, b, c) want Foo(matcherA, matcherB, matcherC, matcherD)345			// Got Foo(a, b, c, d) want Foo(matcherA, matcherB, matcherC, matcherD, matcherE)346			// Got Foo(a, b, c, d, e) want Foo(matcherA, matcherB, matcherC, matcherD)347			// Got Foo(a, b, c) want Foo(matcherA, matcherB)348			return fmt.Errorf("expected call at %s doesn't match the argument at index %s.\nGot: %v\nWant: %v",349				c.origin, strconv.Itoa(i), formatGottenArg(m, args[i:]), c.args[i])350		}351	}352	// Check that all prerequisite calls have been satisfied.353	for _, preReqCall := range c.preReqs {354		if !preReqCall.satisfied() {355			return fmt.Errorf("expected call at %s doesn't have a prerequisite call satisfied:\n%v\nshould be called before:\n%v",356				c.origin, preReqCall, c)357		}358	}359	// Check that the call is not exhausted.360	if c.exhausted() {361		return fmt.Errorf("expected call at %s has already been called the max number of times", c.origin)362	}363	return nil364}365// dropPrereqs tells the expected Call to not re-check prerequisite calls any366// longer, and to return its current set.367func (c *Call) dropPrereqs() (preReqs []*Call) {368	preReqs = c.preReqs369	c.preReqs = nil370	return371}372func (c *Call) call() []func([]interface{}) []interface{} {373	c.numCalls++374	return c.actions375}376// InOrder declares that the given calls should occur in order.377func InOrder(calls ...*Call) {378	for i := 1; i < len(calls); i++ {379		calls[i].After(calls[i-1])380	}381}382func setSlice(arg interface{}, v reflect.Value) {383	va := reflect.ValueOf(arg)384	for i := 0; i < v.Len(); i++ {385		va.Index(i).Set(v.Index(i))386	}387}388func (c *Call) addAction(action func([]interface{}) []interface{}) {389	c.actions = append(c.actions, action)390}391func formatGottenArg(m Matcher, arg interface{}) string {392	got := fmt.Sprintf("%v (%T)", arg, arg)393	if gs, ok := m.(GotFormatter); ok {394		got = gs.Got(arg)395	}396	return got397}...

1formatGottenArg := gomock.NewController(t)2defer formatGottenArg.Finish()3mockFormatGottenArg := NewMockFormatGottenArg(formatGottenArg)4mockFormatGottenArg.EXPECT().FormatGottenArg(gomock.Any()).Return("test")5formatGottenArg := gomock.NewController(t)6defer formatGottenArg.Finish()7mockFormatGottenArg := NewMockFormatGottenArg(formatGottenArg)

1    func TestFormatGottenArg(t *testing.T) {2    	ctrl := gomock.NewController(t)3    	defer ctrl.Finish()4    	m := NewMockFormatGottenArg(ctrl)5    	m.EXPECT().FormatGottenArg("hello").Return("hello")6    	m.FormatGottenArg("hello")7    }8    func TestFormatGottenArg(t *testing.T) {9    	ctrl := gomock.NewController(t)10    	defer ctrl.Finish()11    	m := NewMockFormatGottenArg(ctrl)12    	m.EXPECT().FormatGottenArg("hello").Return("hello")13    	m.FormatGottenArg("hello")14    }15    func TestFormatGottenArg(t *testing.T) {16    	ctrl := gomock.NewController(t)17    	defer ctrl.Finish()18    	m := NewMockFormatGottenArg(ctrl)19    	m.EXPECT().FormatGottenArg("hello").Return("hello")20    	m.FormatGottenArg("hello")21    }22    func TestFormatGottenArg(t *testing.T) {23    	ctrl := gomock.NewController(t)24    	defer ctrl.Finish()25    	m := NewMockFormatGottenArg(ctrl)26    	m.EXPECT().FormatGottenArg("hello").Return("hello")27    	m.FormatGottenArg("hello")28    }29    func TestFormatGottenArg(t *

1func main() {2}3type Gomock struct {4}5func (g *Gomock) formatGottenArg() {6}7func (g *Gomock) formatArg() {8}9func main() {10}11type Gomock struct {12}13func (g *Gomock) formatGottenArg() {14}15func (g *Gomock) formatArg() {16}

1import (2var Mock = fixtures.NewMockGottenArg()3This file should be in the same directory as the files that you want to use the gomock instance. Now, you can import this package in the files that you want to use the gomock instance. The files should look like this:4import (5func main() {6	fmt.Println(gomock.Mock.FormatGottenArg("foo"))7}8import (9func main() {10	fmt.Println(gomock.Mock.FormatGottenArg("foo"))11}