[helm] The namespace is added twice to the helm command

[aqeelat]

Describe the bug
When calling helm.RenderTemplate, it appends the namespace to the args:

terratest/modules/helm/template.go

Lines 51 to 54 in fc19428

	args := []string{}
	if options.KubectlOptions != nil && options.KubectlOptions.Namespace != "" {
	args = append(args, "--namespace", options.KubectlOptions.Namespace)
	}

However, when we then get to prepareHelmCommand, it also appends the namespace without checking if it is already in args

terratest/modules/helm/cmd.go

Line 69 in fc19428

args = append(args, getNamespaceArgs(options)...)

To Reproduce
I came across it while debugging this test. It is a minimally reproducible test.

Expected behavior
For the namespace to only be added once

Nice to have
The values of args and additionalArgs before exiting prepareHelmCommand

Versions

• Terratest version: 0.47.1