I, think, that binders are done, both dynamic functions with different results every time (based on the context) and static services (interface as input(to give the devs the chance make better and most testable code) and struct or both are structs)

Former-commit-id: eb395b06003ea9eae005a36c9c6be0ef63c4d41d

mvc2/service_test.go

@@ -0,0 +1,46 @@
+package mvc2
+
+import (
+	"reflect"
+	"testing"
+)
+
+type (
+	testService interface {
+		say(string)
+	}
+	testServiceImpl struct {
+		prefix string
+	}
+)
+
+func (s *testServiceImpl) say(message string) string {
+	return s.prefix + ": " + message
+}
+
+func TestMakeServiceInputBinder(t *testing.T) {
+	expectedService := &testServiceImpl{"say"}
+	b := MustMakeServiceInputBinder(expectedService)
+	// in
+	var (
+		intType          = reflect.TypeOf(1)
+		availableBinders = []*InputBinder{b}
+	)
+
+	// 1
+	testCheck(t, "test1", true, testGetBindersForInput(t, availableBinders,
+		[]interface{}{expectedService}, reflect.TypeOf(expectedService)))
+	// 2
+	testCheck(t, "test2-fail", false, testGetBindersForInput(t, availableBinders,
+		[]interface{}{42}))
+	// 3
+	testCheck(t, "test3-fail", false, testGetBindersForInput(t, availableBinders,
+		[]interface{}{42}, intType))
+	// 4
+	testCheck(t, "test4-fail", false, testGetBindersForInput(t, availableBinders,
+		[]interface{}{42}))
+	// 5 - check if nothing passed, so no valid binders at all.
+	testCheck(t, "test5", true, testGetBindersForInput(t, availableBinders,
+		[]interface{}{}))
+
+}