Container and Resolver interfaces. Resolver can resolve against multiple containers.

[HnH]

func (suite *ResolverSuite) TestResolveMultiContainer() {
	var (
		localContainer   = di.NewContainer()
		localResolver, _ = di.NewResolver(localContainer, suite.container)
	)

	suite.Require().NoError(suite.container.Singleton(newRectangle))
	suite.Require().NoError(localContainer.Singleton(newMySQL))

	var s Shape
	suite.Require().NoError(suite.resolver.Resolve(&s))
	suite.Require().IsType(&Rectangle{}, s)

	var db Database
	suite.Require().EqualError(suite.resolver.Resolve(&db), "di: no binding found for: di_test.Database")
	suite.Require().Nil(db)

	suite.Require().NoError(localResolver.Resolve(&db))
	suite.Require().IsType(&MySQL{}, db)
}