diff --git a/tests/.gitignore b/tests/.gitignore
index cc5778c..fdf2554 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -1,2 +1,5 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 .terraform/
 .terraform.lock.hcl
diff --git a/tests/data_source_git_branch.tf b/tests/data_source_git_branch.tf
index 28a67c3..c2ce76c 100644
--- a/tests/data_source_git_branch.tf
+++ b/tests/data_source_git_branch.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 data "git_branch" "main" {
   directory = data.git_repository.repository.directory
   name      = "main"
diff --git a/tests/data_source_git_branches.tf b/tests/data_source_git_branches.tf
index 4d4d94b..41c35fb 100644
--- a/tests/data_source_git_branches.tf
+++ b/tests/data_source_git_branches.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 data "git_branches" "branches" {
   directory = data.git_repository.repository.directory
 }
diff --git a/tests/data_source_git_config.tf b/tests/data_source_git_config.tf
index e3c0b0f..5321bb9 100644
--- a/tests/data_source_git_config.tf
+++ b/tests/data_source_git_config.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 data "git_config" "defaults" {
   directory = data.git_repository.repository.directory
 }
diff --git a/tests/data_source_git_remote.tf b/tests/data_source_git_remote.tf
index 2dc7d10..9680ece 100644
--- a/tests/data_source_git_remote.tf
+++ b/tests/data_source_git_remote.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 data "git_remote" "origin" {
   directory = data.git_repository.repository.directory
   name      = "origin"
diff --git a/tests/data_source_git_remotes.tf b/tests/data_source_git_remotes.tf
index aebb4f6..8513388 100644
--- a/tests/data_source_git_remotes.tf
+++ b/tests/data_source_git_remotes.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 data "git_remotes" "remotes" {
   directory = data.git_repository.repository.directory
 }
diff --git a/tests/data_source_git_repository.tf b/tests/data_source_git_repository.tf
index cca5fc2..c9e73ca 100644
--- a/tests/data_source_git_repository.tf
+++ b/tests/data_source_git_repository.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 data "git_repository" "repository" {
   directory = var.git_repo_path
 }
diff --git a/tests/data_source_git_tags.tf b/tests/data_source_git_tags.tf
index 9d554da..e2174aa 100644
--- a/tests/data_source_git_tags.tf
+++ b/tests/data_source_git_tags.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 data "git_tags" "tags" {
   directory = data.git_repository.repository.directory
 }
diff --git a/tests/main.tf b/tests/main.tf
index f206dab..4267981 100644
--- a/tests/main.tf
+++ b/tests/main.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 terraform {
   required_providers {
     git = {
diff --git a/tests/variables.tf b/tests/variables.tf
index 663a850..9163cd7 100644
--- a/tests/variables.tf
+++ b/tests/variables.tf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The terraform-provider-git Authors
+# SPDX-License-Identifier: 0BSD
+
 variable "git_repo_path" {
   type        = string
   description = "The root directory of a Git repository."