diff --git a/terraform/main.tf b/terraform/main.tf
index 21e9c66..498edbc 100644
--- a/terraform/main.tf
+++ b/terraform/main.tf
@@ -1,9 +1,34 @@
 locals {
-  config           = yamldecode(file(var.path))
+  config = yamldecode(file(var.path))
+
+  repositories = [
+    for repository in try(local.config.repositories, []) : {
+      # Metadata
+      name         = repository.name
+      description  = try(repository.description, null)
+      homepage_url = try(repository.homepage_url, null)
+      topics       = try(repository.topics, null)
+      # Properties
+      visibility  = try(repository.visibility, local.config.organization.all-repositories.visibility, null)
+      is_template = try(repository.is_template, null)
+      # Features
+      has_issues      = try(repository.has_issues, local.config.organization.all-repositories.has_issues, null)
+      has_discussions = try(repository.has_discussions, local.config.organization.all-repositories.has_discussions, null)
+      has_projects    = try(repository.has_projects, local.config.organization.all-repositories.has_projects, null)
+      has_wiki        = try(repository.has_wiki, local.config.organization.all-repositories.has_wiki, null)
+      # Settings
+      allow_merge_commit     = try(repository.allow_merge_commit, local.config.organization.all-repositories.allow_merge_commit, null)
+      allow_squash_merge     = try(repository.allow_squash_merge, local.config.organization.all-repositories.allow_squash_merge, null)
+      allow_rebase_merge     = try(repository.allow_rebase_merge, local.config.organization.all-repositories.allow_rebase_merge, null)
+      allow_auto_merge       = try(repository.allow_auto_merge, local.config.organization.all-repositories.allow_auto_merge, null)
+      delete_branch_on_merge = try(repository.delete_branch_on_merge, local.config.organization.all-repositories.delete_branch_on_merge, null)
+    }
+  ]
+
   all_repositories = try(local.config.organization.all-repositories, [])
-  repositories     = try(local.config.repositories, [])
+  repositories0    = try(local.config.repositories, [])
   all_repositories_rulesets = [
-    for pair in try(setproduct(local.repositories, local.all_repositories.rulesets), []) : {
+    for pair in try(setproduct(local.repositories0, local.all_repositories.rulesets), []) : {
       repository = pair[0],
       ruleset    = pair[1]
     }
@@ -11,30 +36,30 @@ locals {
 }
 
 resource "github_repository" "repo" {
-  for_each = { for repo in local.repositories : repo.name => repo }
+  for_each = { for repository in local.repositories : repository.name => repository }
 
   # Metadata
   name         = each.value.name
-  description  = try(each.value.description, null)
-  homepage_url = try(each.value.homepage_url, null)
-  topics       = try(each.value.topics, null)
+  description  = each.value.description
+  homepage_url = each.value.homepage_url
+  topics       = each.value.topics
 
   # Properties
-  visibility  = try(each.value.visibility, local.all_repositories.visibility, null)
-  is_template = try(each.value.is_template, null)
+  visibility  = each.value.visibility
+  is_template = each.value.is_template
 
   # Features
-  has_issues      = try(each.value.has_issues, local.all_repositories.has_issues, null)
-  has_discussions = try(each.value.has_discussions, local.all_repositories.has_discussions, null)
-  has_projects    = try(each.value.has_projects, local.all_repositories.has_projects, null)
-  has_wiki        = try(each.value.has_wiki, local.all_repositories.has_wiki, null)
+  has_issues      = each.value.has_issues
+  has_discussions = each.value.has_discussions
+  has_projects    = each.value.has_projects
+  has_wiki        = each.value.has_wiki
 
   # Settings
-  allow_merge_commit     = try(each.value.allow_merge_commit, local.all_repositories.allow_merge_commit, null)
-  allow_squash_merge     = try(each.value.allow_squash_merge, local.all_repositories.allow_squash_merge, null)
-  allow_rebase_merge     = try(each.value.allow_rebase_merge, local.all_repositories.allow_rebase_merge, null)
-  allow_auto_merge       = try(each.value.allow_auto_merge, local.all_repositories.allow_auto_merge, null)
-  delete_branch_on_merge = try(each.value.delete_branch_on_merge, local.all_repositories.delete_branch_on_merge, null)
+  allow_merge_commit     = each.value.allow_merge_commit
+  allow_squash_merge     = each.value.allow_squash_merge
+  allow_rebase_merge     = each.value.allow_rebase_merge
+  allow_auto_merge       = each.value.allow_auto_merge
+  delete_branch_on_merge = each.value.delete_branch_on_merge
 }
 
 resource "github_repository_ruleset" "all_repositories" {
diff --git a/terraform/tests/defaults.tftest.hcl b/terraform/tests/defaults.tftest.hcl
new file mode 100644
index 0000000..f9f7404
--- /dev/null
+++ b/terraform/tests/defaults.tftest.hcl
@@ -0,0 +1,51 @@
+run "defaults_file_repositories" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/defaults.yaml"
+  }
+
+  assert {
+    condition     = local.config.repositories != []
+    error_message = "Expected defaults config file to produce non-empty repositories local."
+  }
+
+  assert {
+    condition     = length(local.config.repositories) == 1
+    error_message = "Expected defaults config file to produce exactly one repository."
+  }
+
+  assert {
+    condition     = local.config.repositories[0].name == "example"
+    error_message = "Expected defaults config file to produce the repository named 'example'."
+  }
+}
+
+run "defaults_file_repositories_values" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/defaults.yaml"
+  }
+
+  assert {
+    condition = local.repositories == [{
+      name                   = "example"
+      description            = null
+      homepage_url           = null
+      topics                 = null
+      visibility             = null
+      is_template            = null
+      has_issues             = null
+      has_discussions        = null
+      has_projects           = null
+      has_wiki               = null
+      allow_merge_commit     = null
+      allow_squash_merge     = null
+      allow_rebase_merge     = null
+      allow_auto_merge       = null
+      delete_branch_on_merge = null
+    }]
+    error_message = "The example repository defaults expected to be null."
+  }
+}
diff --git a/terraform/tests/empty.tftest.hcl b/terraform/tests/empty.tftest.hcl
index f4352e0..1ab7834 100644
--- a/terraform/tests/empty.tftest.hcl
+++ b/terraform/tests/empty.tftest.hcl
@@ -7,6 +7,11 @@ run "empty_file" {
 
   assert {
     condition     = local.config == null
-    error_message = "Expected empty file to produce empty result."
+    error_message = "Expected empty file to produce empty configuration."
+  }
+
+  assert {
+    condition     = local.repositories == []
+    error_message = "Expected empty file to produce empty repositories."
   }
 }
diff --git a/terraform/tests/fixtures/defaults.yaml b/terraform/tests/fixtures/defaults.yaml
new file mode 100644
index 0000000..2c1660e
--- /dev/null
+++ b/terraform/tests/fixtures/defaults.yaml
@@ -0,0 +1,3 @@
+---
+repositories:
+  - name: example
diff --git a/terraform/tests/fixtures/organization-repository-values.yaml b/terraform/tests/fixtures/organization-repository-values.yaml
new file mode 100644
index 0000000..b1f465f
--- /dev/null
+++ b/terraform/tests/fixtures/organization-repository-values.yaml
@@ -0,0 +1,37 @@
+---
+organization:
+  all-repositories:
+    # Properties
+    visibility: public
+    # Features
+    has_issues: false
+    has_discussions: false
+    has_projects: false
+    has_wiki: false
+    # Settings
+    allow_merge_commit: false
+    allow_squash_merge: false
+    allow_rebase_merge: false
+    allow_auto_merge: false
+    delete_branch_on_merge: false
+repositories:
+  - name: example
+    # Metadata
+    description: An example repository
+    homepage_url: https://example.com
+    topics:
+      - example-topic
+    # Properties
+    visibility: private
+    is_template: true
+    # Features
+    has_issues: true
+    has_discussions: true
+    has_projects: true
+    has_wiki: true
+    # Settings
+    allow_merge_commit: true
+    allow_squash_merge: true
+    allow_rebase_merge: true
+    allow_auto_merge: true
+    delete_branch_on_merge: true
diff --git a/terraform/tests/fixtures/organization-values.yaml b/terraform/tests/fixtures/organization-values.yaml
new file mode 100644
index 0000000..c2e1183
--- /dev/null
+++ b/terraform/tests/fixtures/organization-values.yaml
@@ -0,0 +1,18 @@
+---
+organization:
+  all-repositories:
+    # Properties
+    visibility: private
+    # Features
+    has_issues: true
+    has_discussions: true
+    has_projects: true
+    has_wiki: true
+    # Settings
+    allow_merge_commit: true
+    allow_squash_merge: true
+    allow_rebase_merge: true
+    allow_auto_merge: true
+    delete_branch_on_merge: true
+repositories:
+  - name: example
diff --git a/terraform/tests/fixtures/repository-values.yaml b/terraform/tests/fixtures/repository-values.yaml
new file mode 100644
index 0000000..219acd5
--- /dev/null
+++ b/terraform/tests/fixtures/repository-values.yaml
@@ -0,0 +1,22 @@
+---
+repositories:
+  - name: example
+    # Metadata
+    description: An example repository
+    homepage_url: https://example.com
+    topics:
+      - example-topic
+    # Properties
+    visibility: private
+    is_template: true
+    # Features
+    has_issues: true
+    has_discussions: true
+    has_projects: true
+    has_wiki: true
+    # Settings
+    allow_merge_commit: true
+    allow_squash_merge: true
+    allow_rebase_merge: true
+    allow_auto_merge: true
+    delete_branch_on_merge: true
diff --git a/terraform/tests/organization-repository-values.tftest.hcl b/terraform/tests/organization-repository-values.tftest.hcl
new file mode 100644
index 0000000..9687dca
--- /dev/null
+++ b/terraform/tests/organization-repository-values.tftest.hcl
@@ -0,0 +1,51 @@
+run "organization_repository_repositories" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/organization-repository-values.yaml"
+  }
+
+  assert {
+    condition     = local.config.repositories != []
+    error_message = "Expected defaults config file to produce non-empty repositories local."
+  }
+
+  assert {
+    condition     = length(local.config.repositories) == 1
+    error_message = "Expected defaults config file to produce exactly one repository."
+  }
+
+  assert {
+    condition     = local.config.repositories[0].name == "example"
+    error_message = "Expected defaults config file to produce the repository named 'example'."
+  }
+}
+
+run "organization_repository_repositories_values" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/organization-repository-values.yaml"
+  }
+
+  assert {
+    condition = local.repositories == [{
+      name                   = "example"
+      description            = "An example repository"
+      homepage_url           = "https://example.com"
+      topics                 = ["example-topic"]
+      visibility             = "private"
+      is_template            = true
+      has_issues             = true
+      has_discussions        = true
+      has_projects           = true
+      has_wiki               = true
+      allow_merge_commit     = true
+      allow_squash_merge     = true
+      allow_rebase_merge     = true
+      allow_auto_merge       = true
+      delete_branch_on_merge = true
+    }]
+    error_message = "The example repository expected to be set to concrete values."
+  }
+}
diff --git a/terraform/tests/organization-values.tftest.hcl b/terraform/tests/organization-values.tftest.hcl
new file mode 100644
index 0000000..e762588
--- /dev/null
+++ b/terraform/tests/organization-values.tftest.hcl
@@ -0,0 +1,51 @@
+run "organization_values_repositories" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/organization-values.yaml"
+  }
+
+  assert {
+    condition     = local.config.repositories != []
+    error_message = "Expected defaults config file to produce non-empty repositories local."
+  }
+
+  assert {
+    condition     = length(local.config.repositories) == 1
+    error_message = "Expected defaults config file to produce exactly one repository."
+  }
+
+  assert {
+    condition     = local.config.repositories[0].name == "example"
+    error_message = "Expected defaults config file to produce the repository named 'example'."
+  }
+}
+
+run "organization_values_repositories_values" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/organization-values.yaml"
+  }
+
+  assert {
+    condition = local.repositories == [{
+      name                   = "example"
+      description            = null
+      homepage_url           = null
+      topics                 = null
+      visibility             = "private"
+      is_template            = null
+      has_issues             = true
+      has_discussions        = true
+      has_projects           = true
+      has_wiki               = true
+      allow_merge_commit     = true
+      allow_squash_merge     = true
+      allow_rebase_merge     = true
+      allow_auto_merge       = true
+      delete_branch_on_merge = true
+    }]
+    error_message = "The example repository expected to be set to concrete values."
+  }
+}
diff --git a/terraform/tests/repository-values.tftest.hcl b/terraform/tests/repository-values.tftest.hcl
new file mode 100644
index 0000000..6fb32d0
--- /dev/null
+++ b/terraform/tests/repository-values.tftest.hcl
@@ -0,0 +1,51 @@
+run "repository_values_file_repositories" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/repository-values.yaml"
+  }
+
+  assert {
+    condition     = local.config.repositories != []
+    error_message = "Expected defaults config file to produce non-empty repositories local."
+  }
+
+  assert {
+    condition     = length(local.config.repositories) == 1
+    error_message = "Expected defaults config file to produce exactly one repository."
+  }
+
+  assert {
+    condition     = local.config.repositories[0].name == "example"
+    error_message = "Expected defaults config file to produce the repository named 'example'."
+  }
+}
+
+run "repository_values_file_repositories_values" {
+  command = plan
+
+  variables {
+    path = "tests/fixtures/repository-values.yaml"
+  }
+
+  assert {
+    condition = local.repositories == [{
+      name                   = "example"
+      description            = "An example repository"
+      homepage_url           = "https://example.com"
+      topics                 = ["example-topic"]
+      visibility             = "private"
+      is_template            = true
+      has_issues             = true
+      has_discussions        = true
+      has_projects           = true
+      has_wiki               = true
+      allow_merge_commit     = true
+      allow_squash_merge     = true
+      allow_rebase_merge     = true
+      allow_auto_merge       = true
+      delete_branch_on_merge = true
+    }]
+    error_message = "The example repository expected to be set to concrete values."
+  }
+}