Helm testing: Cannot map configmap.data correctly when using a Literal Block Scalar

[Mo0rBy]

I think this is probably a bug with Kubernetes go-client rather than TerraTest, but I think it's valuable to post it here for other users.

I have a configmap helm template that should produce an output that looks something like this:

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    app: release-name
  name: release-name
data:
  thisIsSomeDataKey: |
    configmap-data-value-1;
    configmap-data-value-2;

You can see that I am using a "Literal Block Scalar" (search the term here to see more info) for my key thisIsSomeDataKey.

I am rendering my template and then unmarshalling the result into ConfigMap object:

var configmap v1.ConfigMap

options := &helm.Options{
	ValuesFiles: []string{"values/required.yaml"},
	BuildDependencies: true,
}

renderedOutput := helm.RenderTemplate(GinkgoT(), options, helmChartPath, microService, []string{"templates/configmap.yaml"})
helm.UnmarshalK8SYaml(GinkgoT(), renderedOutput, &configmap)

But I can see the output of the template in my console log and the configmap.data values are not present. When performing a manual helm template --debug command, I can see these values in the output template as expected.

Output of the TerraTest helm unmarshal (I also added a print statement to just see what the value was as well)

logger.go:66: apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    app: sir-webapp
  name: sir-webapp
data:
  thisIsSomeDataKey: |                        // The values should be seen here
configmap_test.go:42: map[thisIsSomeDataKey:]

Output of a manual helm template command:

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    app: release-name
  name: release-name
data:
  thisIsSomeDataKey: |
    configmap-data-value-1;      // The values can be seen, as expected
    configmap-data-value-2;

As I said, I think this might be an issue with the unmarshalling, as the ConfigMap.Data field is supposed to be a map[string]string, and using the "Literal Block Scalar" means that this is a bit confusing. Reading the documentation I linked to above, it seems like I should have 1 value, that spans multiple lines, so I would need to include newline characters, however, printing out the value of ConfigMap.Data["thisIsSomeDataKey"] shows that it has no value at all.

Versions

• Terratest version: v0.43.13
• Environment details: MacOS Ventura 13.5.1

Additional context
If this should be posted somewhere else as a Kubernetes bug, can you tell me where the best place would be please.