### Terraform Version ```shell Terraform v1.13.0 on darwin_arm6 ``` ### Terraform Configuration Files # Successful setup ✅ **structure** ``` . ├── providers.tf └── tests ├── modules │   └── test-setup │   └── main.tf └── my-test.tftest.hcl 4 directories, 3 file ``` **providers.tf** ```hcl terraform { required_providers { null = { source = "hashicorp/null" version = "3.2.4" } } } resource "null_resource" "test" { } ``` **my-test.tftest.hcl** ```hcl run "success" { module { source = "./tests/modules/test-setup" } command = plan assert { condition = fileexists("${path.module}/main.tf") error_message = "Unexpected ${path.module}." } } ``` **main.tf** ```hcl terraform { required_providers { null = { source = "hashicorp/null" } } } resource "null_resource" "test" { } ``` # Unsuccessful setup ❌ **structure** ``` . ├── providers.tf └── integration-tests ├── modules │   └── test-setup │   └── main.tf └── my-test.tftest.hcl 4 directories, 3 file ``` **providers.tf** ```hcl terraform { required_providers { null = { source = "hashicorp/null" version = "3.2.4" } } } resource "null_resource" "test" { } ``` **my-test.tftest.hcl** ```hcl run "success" { module { source = "./integration-tests/modules/test-setup" } command = plan assert { condition = fileexists("${path.module}/main.tf") error_message = "Unexpected ${path.module}." } } ``` **main.tf** ```hcl terraform { required_providers { null = { source = "hashicorp/null" } } } resource "null_resource" "test" { } ``` ### Debug Output ``` 2025-08-26T09:21:53.956+0200 [INFO] Terraform version: 1.13.0 2025-08-26T09:21:53.956+0200 [DEBUG] using github.com/hashicorp/go-tfe v1.74.1 2025-08-26T09:21:53.956+0200 [DEBUG] using github.com/hashicorp/hcl/v2 v2.24.0 2025-08-26T09:21:53.956+0200 [DEBUG] using github.com/hashicorp/terraform-svchost v0.1.1 2025-08-26T09:21:53.956+0200 [DEBUG] using github.com/zclconf/go-cty v1.16.3 2025-08-26T09:21:53.956+0200 [INFO] Go runtime version: go1.24.5 2025-08-26T09:21:53.956+0200 [INFO] CLI args: []string{"terraform", "test", "-test-directory=integration-tests"} 2025-08-26T09:21:53.956+0200 [TRACE] Stdout is a terminal of width 170 2025-08-26T09:21:53.956+0200 [TRACE] Stderr is a terminal of width 170 2025-08-26T09:21:53.956+0200 [TRACE] Stdin is a terminal 2025-08-26T09:21:53.956+0200 [DEBUG] Attempting to open CLI config file: /Users/####/.terraformrc 2025-08-26T09:21:53.956+0200 [DEBUG] File doesn't exist, but doesn't need to. Ignoring. 2025-08-26T09:21:53.956+0200 [DEBUG] ignoring non-existing provider search directory terraform.d/plugins 2025-08-26T09:21:53.956+0200 [DEBUG] ignoring non-existing provider search directory /Users/####/.terraform.d/plugins 2025-08-26T09:21:53.956+0200 [DEBUG] ignoring non-existing provider search directory /Users/####/Library/Application Support/io.terraform/plugins 2025-08-26T09:21:53.956+0200 [DEBUG] ignoring non-existing provider search directory /Library/Application Support/io.terraform/plugins 2025-08-26T09:21:53.957+0200 [INFO] CLI command args: []string{"test", "-test-directory=integration-tests"} ``` ### Expected Behavior Successfully runs test in both cases ### Actual Behavior Fails with error ``` │ Error: Module not installed │ │ on integration-tests/my-test.tftest.hcl line 3, in run "success": │ 3: module { │ │ This module is not yet installed. Run "terraform init" to install all modules required by this configuration. ``` ### Steps to Reproduce Use setup from `Successful setup ✅` 1. terraform init 2. terraform test **=>** Works as expected. Use setup from `Unsuccessful setup ❌` 1. terraform init 2. terraform test -test-directory=integration-tests **=>** Throws error. ### Additional Context - I tried changing the path of the module in different variations. Nothing worked. - My initial use case is that I wanted to create a helper module as [described here](https://developer.hashicorp.com/terraform/tutorials/configuration-language/test#create-a-new-helper-module) - The differing directory name `integration-test` results from my idea to split integration test which do an actual `apply` and unit tests which would only perform a `plan`. This way I could keep my test types separated, my code base clean and I'm able to control the execution in my pipeline ### References _No response_ ### Generative AI / LLM assisted development? _No response_