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// Copyright 2010 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gomock
import (
"fmt"
"reflect"
"strconv"
"strings"
)
// Call represents an expected call to a mock.
type Call struct {
t TestHelper // for triggering test failures on invalid call setup
receiver interface{} // the receiver of the method call
method string // the name of the method
methodType reflect.Type // the type of the method
args []Matcher // the args
origin string // file and line number of call setup
preReqs []*Call // prerequisite calls
// Expectations
minCalls, maxCalls int
numCalls int // actual number made
// actions are called when this Call is called. Each action gets the args and
// can set the return values by returning a non-nil slice. Actions run in the
// order they are created.
actions []func([]interface{}) []interface{}
}
// newCall creates a *Call. It requires the method type in order to support
// unexported methods.
func newCall(t TestHelper, receiver interface{}, method string, methodType reflect.Type, args ...interface{}) *Call {
t.Helper()
// TODO: check arity, types.
mArgs := make([]Matcher, len(args))
for i, arg := range args {
if m, ok := arg.(Matcher); ok {
mArgs[i] = m
} else if arg == nil {
// Handle nil specially so that passing a nil interface value
// will match the typed nils of concrete args.
mArgs[i] = Nil()
} else {
mArgs[i] = Eq(arg)
}
}
// callerInfo's skip should be updated if the number of calls between the user's test
// and this line changes, i.e. this code is wrapped in another anonymous function.
// 0 is us, 1 is RecordCallWithMethodType(), 2 is the generated recorder, and 3 is the user's test.
origin := callerInfo(3)
actions := []func([]interface{}) []interface{}{func([]interface{}) []interface{} {
// Synthesize the zero value for each of the return args' types.
rets := make([]interface{}, methodType.NumOut())
for i := 0; i < methodType.NumOut(); i++ {
rets[i] = reflect.Zero(methodType.Out(i)).Interface()
}
return rets
}}
return &Call{t: t, receiver: receiver, method: method, methodType: methodType,
args: mArgs, origin: origin, minCalls: 1, maxCalls: 1, actions: actions}
}
// AnyTimes allows the expectation to be called 0 or more times
func (c *Call) AnyTimes() *Call {
c.minCalls, c.maxCalls = 0, 1e8 // close enough to infinity
return c
}
// MinTimes requires the call to occur at least n times. If AnyTimes or MaxTimes have not been called or if MaxTimes
// was previously called with 1, MinTimes also sets the maximum number of calls to infinity.
func (c *Call) MinTimes(n int) *Call {
c.minCalls = n
if c.maxCalls == 1 {
c.maxCalls = 1e8
}
return c
}
// MaxTimes limits the number of calls to n times. If AnyTimes or MinTimes have not been called or if MinTimes was
// previously called with 1, MaxTimes also sets the minimum number of calls to 0.
func (c *Call) MaxTimes(n int) *Call {
c.maxCalls = n
if c.minCalls == 1 {
c.minCalls = 0
}
return c
}
// DoAndReturn declares the action to run when the call is matched.
// The return values from this function are returned by the mocked function.
// It takes an interface{} argument to support n-arity functions.
func (c *Call) DoAndReturn(f interface{}) *Call {
// TODO: Check arity and types here, rather than dying badly elsewhere.
v := reflect.ValueOf(f)
c.addAction(func(args []interface{}) []interface{} {
c.t.Helper()
vArgs := make([]reflect.Value, len(args))
ft := v.Type()
if c.methodType.NumIn() != ft.NumIn() {
c.t.Fatalf("wrong number of arguments in DoAndReturn func for %T.%v: got %d, want %d [%s]",
c.receiver, c.method, ft.NumIn(), c.methodType.NumIn(), c.origin)
return nil
}
for i := 0; i < len(args); i++ {
if args[i] != nil {
vArgs[i] = reflect.ValueOf(args[i])
} else {
// Use the zero value for the arg.
vArgs[i] = reflect.Zero(ft.In(i))
}
}
vRets := v.Call(vArgs)
rets := make([]interface{}, len(vRets))
for i, ret := range vRets {
rets[i] = ret.Interface()
}
return rets
})
return c
}
// Do declares the action to run when the call is matched. The function's
// return values are ignored to retain backward compatibility. To use the
// return values call DoAndReturn.
// It takes an interface{} argument to support n-arity functions.
func (c *Call) Do(f interface{}) *Call {
// TODO: Check arity and types here, rather than dying badly elsewhere.
v := reflect.ValueOf(f)
c.addAction(func(args []interface{}) []interface{} {
c.t.Helper()
if c.methodType.NumIn() != v.Type().NumIn() {
c.t.Fatalf("wrong number of arguments in Do func for %T.%v: got %d, want %d [%s]",
c.receiver, c.method, v.Type().NumIn(), c.methodType.NumIn(), c.origin)
return nil
}
vArgs := make([]reflect.Value, len(args))
ft := v.Type()
for i := 0; i < len(args); i++ {
if args[i] != nil {
vArgs[i] = reflect.ValueOf(args[i])
} else {
// Use the zero value for the arg.
vArgs[i] = reflect.Zero(ft.In(i))
}
}
v.Call(vArgs)
return nil
})
return c
}
// Return declares the values to be returned by the mocked function call.
func (c *Call) Return(rets ...interface{}) *Call {
c.t.Helper()
mt := c.methodType
if len(rets) != mt.NumOut() {
c.t.Fatalf("wrong number of arguments to Return for %T.%v: got %d, want %d [%s]",
c.receiver, c.method, len(rets), mt.NumOut(), c.origin)
}
for i, ret := range rets {
if got, want := reflect.TypeOf(ret), mt.Out(i); got == want {
// Identical types; nothing to do.
} else if got == nil {
// Nil needs special handling.
switch want.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
// ok
default:
c.t.Fatalf("argument %d to Return for %T.%v is nil, but %v is not nillable [%s]",
i, c.receiver, c.method, want, c.origin)
}
} else if got.AssignableTo(want) {
// Assignable type relation. Make the assignment now so that the generated code
// can return the values with a type assertion.
v := reflect.New(want).Elem()
v.Set(reflect.ValueOf(ret))
rets[i] = v.Interface()
} else {
c.t.Fatalf("wrong type of argument %d to Return for %T.%v: %v is not assignable to %v [%s]",
i, c.receiver, c.method, got, want, c.origin)
}
}
c.addAction(func([]interface{}) []interface{} {
return rets
})
return c
}
// Times declares the exact number of times a function call is expected to be executed.
func (c *Call) Times(n int) *Call {
c.minCalls, c.maxCalls = n, n
return c
}
// SetArg declares an action that will set the nth argument's value,
// indirected through a pointer. Or, in the case of a slice, SetArg
// will copy value's elements into the nth argument.
func (c *Call) SetArg(n int, value interface{}) *Call {
c.t.Helper()
mt := c.methodType
// TODO: This will break on variadic methods.
// We will need to check those at invocation time.
if n < 0 || n >= mt.NumIn() {
c.t.Fatalf("SetArg(%d, ...) called for a method with %d args [%s]",
n, mt.NumIn(), c.origin)
}
// Permit setting argument through an interface.
// In the interface case, we don't (nay, can't) check the type here.
at := mt.In(n)
switch at.Kind() {
case reflect.Ptr:
dt := at.Elem()
if vt := reflect.TypeOf(value); !vt.AssignableTo(dt) {
c.t.Fatalf("SetArg(%d, ...) argument is a %v, not assignable to %v [%s]",
n, vt, dt, c.origin)
}
case reflect.Interface:
// nothing to do
case reflect.Slice:
// nothing to do
default:
c.t.Fatalf("SetArg(%d, ...) referring to argument of non-pointer non-interface non-slice type %v [%s]",
n, at, c.origin)
}
c.addAction(func(args []interface{}) []interface{} {
v := reflect.ValueOf(value)
switch reflect.TypeOf(args[n]).Kind() {
case reflect.Slice:
setSlice(args[n], v)
default:
reflect.ValueOf(args[n]).Elem().Set(v)
}
return nil
})
return c
}
// isPreReq returns true if other is a direct or indirect prerequisite to c.
func (c *Call) isPreReq(other *Call) bool {
for _, preReq := range c.preReqs {
if other == preReq || preReq.isPreReq(other) {
return true
}
}
return false
}
// After declares that the call may only match after preReq has been exhausted.
func (c *Call) After(preReq *Call) *Call {
c.t.Helper()
if c == preReq {
c.t.Fatalf("A call isn't allowed to be its own prerequisite")
}
if preReq.isPreReq(c) {
c.t.Fatalf("Loop in call order: %v is a prerequisite to %v (possibly indirectly).", c, preReq)
}
c.preReqs = append(c.preReqs, preReq)
return c
}
// Returns true if the minimum number of calls have been made.
func (c *Call) satisfied() bool {
return c.numCalls >= c.minCalls
}
// Returns true if the maximum number of calls have been made.
func (c *Call) exhausted() bool {
return c.numCalls >= c.maxCalls
}
func (c *Call) String() string {
args := make([]string, len(c.args))
for i, arg := range c.args {
args[i] = arg.String()
}
arguments := strings.Join(args, ", ")
return fmt.Sprintf("%T.%v(%s) %s", c.receiver, c.method, arguments, c.origin)
}
// Tests if the given call matches the expected call.
// If yes, returns nil. If no, returns error with message explaining why it does not match.
func (c *Call) matches(args []interface{}) error {
if !c.methodType.IsVariadic() {
if len(args) != len(c.args) {
return fmt.Errorf("expected call at %s has the wrong number of arguments. Got: %d, want: %d",
c.origin, len(args), len(c.args))
}
for i, m := range c.args {
if !m.Matches(args[i]) {
return fmt.Errorf(
"expected call at %s doesn't match the argument at index %d.\nGot: %v\nWant: %v",
c.origin, i, formatGottenArg(m, args[i]), m,
)
}
}
} else {
if len(c.args) < c.methodType.NumIn()-1 {
return fmt.Errorf("expected call at %s has the wrong number of matchers. Got: %d, want: %d",
c.origin, len(c.args), c.methodType.NumIn()-1)
}
if len(c.args) != c.methodType.NumIn() && len(args) != len(c.args) {
return fmt.Errorf("expected call at %s has the wrong number of arguments. Got: %d, want: %d",
c.origin, len(args), len(c.args))
}
if len(args) < len(c.args)-1 {
return fmt.Errorf("expected call at %s has the wrong number of arguments. Got: %d, want: greater than or equal to %d",
c.origin, len(args), len(c.args)-1)
}
for i, m := range c.args {
if i < c.methodType.NumIn()-1 {
// Non-variadic args
if !m.Matches(args[i]) {
return fmt.Errorf("expected call at %s doesn't match the argument at index %s.\nGot: %v\nWant: %v",
c.origin, strconv.Itoa(i), formatGottenArg(m, args[i]), m)
}
continue
}
// The last arg has a possibility of a variadic argument, so let it branch
// sample: Foo(a int, b int, c ...int)
if i < len(c.args) && i < len(args) {
if m.Matches(args[i]) {
// Got Foo(a, b, c) want Foo(matcherA, matcherB, gomock.Any())
// Got Foo(a, b, c) want Foo(matcherA, matcherB, someSliceMatcher)
// Got Foo(a, b, c) want Foo(matcherA, matcherB, matcherC)
// Got Foo(a, b) want Foo(matcherA, matcherB)
// Got Foo(a, b, c, d) want Foo(matcherA, matcherB, matcherC, matcherD)
continue
}
}
// The number of actual args don't match the number of matchers,
// or the last matcher is a slice and the last arg is not.
// If this function still matches it is because the last matcher
// matches all the remaining arguments or the lack of any.
// Convert the remaining arguments, if any, into a slice of the
// expected type.
vArgsType := c.methodType.In(c.methodType.NumIn() - 1)
vArgs := reflect.MakeSlice(vArgsType, 0, len(args)-i)
for _, arg := range args[i:] {
vArgs = reflect.Append(vArgs, reflect.ValueOf(arg))
}
if m.Matches(vArgs.Interface()) {
// Got Foo(a, b, c, d, e) want Foo(matcherA, matcherB, gomock.Any())
// Got Foo(a, b, c, d, e) want Foo(matcherA, matcherB, someSliceMatcher)
// Got Foo(a, b) want Foo(matcherA, matcherB, gomock.Any())
// Got Foo(a, b) want Foo(matcherA, matcherB, someEmptySliceMatcher)
break
}
// Wrong number of matchers or not match. Fail.
// Got Foo(a, b) want Foo(matcherA, matcherB, matcherC, matcherD)
// Got Foo(a, b, c) want Foo(matcherA, matcherB, matcherC, matcherD)
// Got Foo(a, b, c, d) want Foo(matcherA, matcherB, matcherC, matcherD, matcherE)
// Got Foo(a, b, c, d, e) want Foo(matcherA, matcherB, matcherC, matcherD)
// Got Foo(a, b, c) want Foo(matcherA, matcherB)
return fmt.Errorf("expected call at %s doesn't match the argument at index %s.\nGot: %v\nWant: %v",
c.origin, strconv.Itoa(i), formatGottenArg(m, args[i:]), c.args[i])
}
}
// Check that all prerequisite calls have been satisfied.
for _, preReqCall := range c.preReqs {
if !preReqCall.satisfied() {
return fmt.Errorf("expected call at %s doesn't have a prerequisite call satisfied:\n%v\nshould be called before:\n%v",
c.origin, preReqCall, c)
}
}
// Check that the call is not exhausted.
if c.exhausted() {
return fmt.Errorf("expected call at %s has already been called the max number of times", c.origin)
}
return nil
}
// dropPrereqs tells the expected Call to not re-check prerequisite calls any
// longer, and to return its current set.
func (c *Call) dropPrereqs() (preReqs []*Call) {
preReqs = c.preReqs
c.preReqs = nil
return
}
func (c *Call) call() []func([]interface{}) []interface{} {
c.numCalls++
return c.actions
}
// InOrder declares that the given calls should occur in order.
func InOrder(calls ...*Call) {
for i := 1; i < len(calls); i++ {
calls[i].After(calls[i-1])
}
}
func setSlice(arg interface{}, v reflect.Value) {
va := reflect.ValueOf(arg)
for i := 0; i < v.Len(); i++ {
va.Index(i).Set(v.Index(i))
}
}
func (c *Call) addAction(action func([]interface{}) []interface{}) {
c.actions = append(c.actions, action)
}
func formatGottenArg(m Matcher, arg interface{}) string {
got := fmt.Sprintf("%v (%T)", arg, arg)
if gs, ok := m.(GotFormatter); ok {
got = gs.Got(arg)
}
return got
}