Acceptance test output:

% make testacc TESTARGS='-run=TestAccOrganizations_serial/OrganizationalUnit' PKG=organizations
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/organizations/... -v -count 1 -parallel 20  -run=TestAccOrganizations_serial/OrganizationalUnit -timeout 180m
=== RUN   TestAccOrganizations_serial
=== PAUSE TestAccOrganizations_serial
=== CONT  TestAccOrganizations_serial
=== RUN   TestAccOrganizations_serial/OrganizationalUnit
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/ChildAccountsDataSource_basic
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/DescendantAccountsDataSource_basic
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/PluralDataSource_basic
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/basic
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/disappears
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/update
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/tags
=== RUN   TestAccOrganizations_serial/OrganizationalUnit/DataSource_basic
--- PASS: TestAccOrganizations_serial (253.25s)
    --- PASS: TestAccOrganizations_serial/OrganizationalUnit (253.25s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/ChildAccountsDataSource_basic (19.81s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/DescendantAccountsDataSource_basic (31.30s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/PluralDataSource_basic (23.93s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/basic (27.58s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/disappears (21.07s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/update (43.95s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/tags (61.44s)
        --- PASS: TestAccOrganizations_serial/OrganizationalUnit/DataSource_basic (24.17s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/organizations	258.977s