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package testing
import (
"reflect"
"sync"
"github.com/juju/loggo/v2"
)
// NewCallMocker returns a CallMocker which will log calls and results
// utilizing the given logger.
func NewCallMocker(logger loggo.Logger) *CallMocker {
return &CallMocker{
logger: logger,
results: make(map[string][]*callMockReturner),
}
}
// CallMocker is a tool which allows tests to dynamically specify
// results for a given set of input parameters.
type CallMocker struct {
Stub
logger loggo.Logger
results map[string][]*callMockReturner
}
// MethodCall logs the call to a method and any results that will be
// returned. It returns the results previously specified by the Call
// function. If no results were specified, the returned slice will be
// nil.
func (m *CallMocker) MethodCall(receiver interface{}, fnName string, args ...interface{}) []interface{} {
m.Stub.MethodCall(receiver, fnName, args...)
m.logger.Debugf("Call: %s(%v)", fnName, args)
results := m.Results(fnName, args...)
m.logger.Debugf("Results: %v", results)
return results
}
// Results returns any results previously specified by calls to the
// Call method. If there are no results, the returned slice will be
// nil.
func (m *CallMocker) Results(fnName string, args ...interface{}) []interface{} {
for _, r := range m.results[fnName] {
if reflect.DeepEqual(r.args, args) == false {
continue
}
r.logCall()
return r.retVals
}
return nil
}
// Call is the first half a chained-predicate which registers that
// calls to a function named fnName with arguments args should return
// some value. The returned values are handled by the returned type,
// callMockReturner.
func (m *CallMocker) Call(fnName string, args ...interface{}) *callMockReturner {
returner := &callMockReturner{args: args}
// Push on the front to hide old results.
m.results[fnName] = append([]*callMockReturner{returner}, m.results[fnName]...)
return returner
}
type callMockReturner struct {
// args holds a reference to the arguments for which the retVals
// are valid.
args []interface{}
// retVals holds a reference to the values that should be returned
// when the values held by args are seen.
retVals []interface{}
// timesInvoked records the number of times this return has been
// reached.
timesInvoked struct {
sync.Mutex
value int
}
}
// Returns declares that this returner should return retVals when
// called. It returns a closure which can be called to determine the
// number of times this return has happened.
func (m *callMockReturner) Returns(retVals ...interface{}) func() int {
m.retVals = retVals
return m.numTimesInvoked
}
func (m *callMockReturner) logCall() {
m.timesInvoked.Lock()
defer m.timesInvoked.Unlock()
m.timesInvoked.value++
}
func (m *callMockReturner) numTimesInvoked() int {
m.timesInvoked.Lock()
defer m.timesInvoked.Unlock()
return m.timesInvoked.value
}
func TypeAssertError(err interface{}) error {
if err == nil {
return nil
}
return err.(error)
}
|
