Hi all, I can't find any example of how to mock component resources for unit testing. Specifically, in my program I use https://www.pulumi.com/registry/packages/awsx/api-docs/ecs/fargatetaskdefinition/ to use with ecs.Service as

_, err = ecs.NewService(ctx, localName(ctx, "scheduler"), &ecs.ServiceArgs{
		Cluster:        cluster.Arn,
		TaskDefinition: schedulerTaskDefinition.TaskDefinition.Arn(),
		DesiredCount:   <http://pulumi.Int|pulumi.Int>(1),
	}, pulumi.Parent(cluster))
	if err != nil {
		return nil, err
	}

Which works fine with

pulumi up

but with tests if panics with

goroutine 70 [running]:
<http://github.com/pulumi/pulumi-aws/sdk/v5/go/aws/ecs.TaskDefinitionOutput.Arn.func1(0x1?)|github.com/pulumi/pulumi-aws/sdk/v5/go/aws/ecs.TaskDefinitionOutput.Arn.func1(0x1?)>
	/home/ekini/go/pkg/mod/github.com/pulumi/pulumi-aws/sdk/v5@v5.33.0/go/aws/ecs/taskDefinition.go:732
reflect.Value.call({0x179b000?, 0x1e69a00?, 0x13?}, {0x1deb5e3, 0x4}, {0xc000707e90, 0x1, 0x2?})
	/usr/lib/go/src/reflect/value.go:586 +0xb0b
reflect.Value.Call({0x179b000?, 0x1e69a00?, 0xc0002c6701?}, {0xc000278690?, 0xc0002786c0?, 0xbf0b1c?})
	/usr/lib/go/src/reflect/value.go:370 +0xbc
<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*applier).Call(0xc000268c80|github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*applier).Call(0xc000268c80>, {0x1fed698?, 0xc000078170?}, {0x1c09c40?, 0x0?, 0x19?})
	/home/ekini/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.60.1/go/pulumi/types.go:494 +0x215
<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*OutputState).applyTWithApplier.func1()|github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*OutputState).applyTWithApplier.func1()>
	/home/ekini/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.60.1/go/pulumi/types.go:606 +0x198
created by <http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*OutputState).applyTWithApplier|github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*OutputState).applyTWithApplier>
	/home/ekini/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.60.1/go/pulumi/types.go:593 +0x325
FAIL	<http://github.com/xxx/infra/xxx|github.com/xxx/infra/xxx>	0.019s
FAIL
[[Command exited with 1]]

https://stackoverflow.com/questions/76009185/how-to-mock-pulumi-resources-in-go-unit-tests might help You should just be able to override NewResource in the mocks to return data expected for your program.

I've tried! But in all those examples those parameters are simple types, but here it's ecs.TaskDefinition I've tried this in many variations:

func (mocks) NewResource(args pulumi.MockResourceArgs) (string, resource.PropertyMap, error) {
> outputs := args.Inputs.Mappable()
> if args.TypeToken == "awsx:ecs:FargateTaskDefinition" {
> > outputs["taskDefinition"] = (&ecs.TaskDefinition{Arn: pulumi.String("fake").ToStringOutput()}).ToTaskDefinitionOutput()

> }
> outputs["arn"] = "arn:aws:ecs:ap-southeast-6:123451234512:fake-arn/fakeresource"
> return args.Name + "_id", resource.NewPropertyMapFromMap(outputs), nil
}

and other things constructing map of parameters, thinking it'll deserialise it into a proper object, which didn't work either