resourcemanager: adding "google_folders" data source

[mikelaramie]

The goal of this PR is to add a new data source to the provider, google_folders, to allow terraform code to enumerate a list of folders within a parent object (org or folder).

The code was modified from the existing google_projects data source to fit the needs of querying folders from the resourcemanager api v3.

[mikelaramie]

Hi @slevenick - is there anything else we need to validate/update here? Thank you!

[mikelaramie]

Hi @megan07 @slevenick is there anything else we need to do here to get this data source added in? Thanks!

[slevenick]

Looks like the test fails with:

provider_test.go:278: Step 1/1 error: Check failed: Check 1/8 error: Not found: data.google_folders.my-folder in [root]

Are you able to run this test locally?

[mikelaramie]

It should pass now; I was running the wrong test locally, and got the failure you saw when I ran the right test. Sorry about that!

❯ make testacc TEST=./google TESTARGS='-run=TestAccDataSourceGoogleFolders_basic'
==> Checking source code against gofmt...
==> Checking that code complies with gofmt requirements...
go generate  ./...
TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test ./google -v -run=TestAccDataSourceGoogleFolders_basic -timeout 240m -ldflags="-X=github.com/hashicorp/terraform-provider-google/version.ProviderVersion=acc"
=== RUN   TestAccDataSourceGoogleFolders_basic
=== PAUSE TestAccDataSourceGoogleFolders_basic
=== CONT  TestAccDataSourceGoogleFolders_basic
--- PASS: TestAccDataSourceGoogleFolders_basic (17.50s)
PASS
ok  	github.com/hashicorp/terraform-provider-google/google	18.199s

[mikelaramie]

I also signed the CLA, so hopefully that check will pass now in MM

[slevenick]

Looks good, thanks!

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