diff --git a/spec/factories/csv_variable_definitions.rb b/spec/factories/csv_variable_definitions.rb
new file mode 100644
index 000000000..24c096f14
--- /dev/null
+++ b/spec/factories/csv_variable_definitions.rb
@@ -0,0 +1,9 @@
+FactoryBot.define do
+  factory :csv_variable_definition do
+    variable { "variable" }
+    definition { "definition" }
+    log_type { "log" }
+    user_type { "support" }
+    year { 2024 }
+  end
+end
diff --git a/spec/lib/tasks/log_variable_definitions_spec.rb b/spec/lib/tasks/log_variable_definitions_spec.rb
new file mode 100644
index 000000000..57b379b1f
--- /dev/null
+++ b/spec/lib/tasks/log_variable_definitions_spec.rb
@@ -0,0 +1,41 @@
+require "rails_helper"
+require "rake"
+
+RSpec.describe "log_variable_definitions" do
+  describe ":add_variable_definitions", type: :task do
+    subject(:task) { Rake::Task["data_import:add_variable_definitions"] }
+
+    let(:path) { "spec/fixtures/variable_definitions" }
+
+    before do
+      Rake.application.rake_require("tasks/log_variable_definitions")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    it "adds CsvVariableDefinition records from each file in the specified directory" do
+      expect { task.invoke(path) }.to change(CsvVariableDefinition, :count).by(419)
+    end
+
+    it "handles an empty directory without errors" do
+      empty_path = "spec/fixtures/empty_directory"
+      FileUtils.mkdir_p(empty_path)
+      expect { task.invoke(empty_path) }.not_to raise_error
+      expect(CsvVariableDefinition.count).to eq(0)
+    end
+
+    it "does not create duplicate records if run multiple times" do
+      CsvVariableDefinition.delete_all
+      initial_count = CsvVariableDefinition.count
+
+      task.invoke(path)
+      first_run_count = CsvVariableDefinition.count
+
+      task.invoke(path)
+      second_run_count = CsvVariableDefinition.count
+
+      expect(first_run_count).to eq(initial_count + 419)
+      expect(second_run_count).to eq(first_run_count)
+    end
+  end
+end
diff --git a/spec/services/imports/variable_definitions_service_spec.rb b/spec/services/imports/variable_definitions_service_spec.rb
new file mode 100644
index 000000000..3efcb0790
--- /dev/null
+++ b/spec/services/imports/variable_definitions_service_spec.rb
@@ -0,0 +1,62 @@
+require "rails_helper"
+
+RSpec.describe Imports::VariableDefinitionsService, type: :service do
+  let(:path) { "spec/fixtures/variable_definitions" }
+  let(:service) { described_class.new(path:) }
+
+  describe "#initialize" do
+    it "initializes with the correct path and count" do
+      expect(service.path).to eq(path)
+      expect(service.count).to eq(0)
+    end
+  end
+
+  describe "#call" do
+    before do
+      allow(Dir).to receive(:glob).and_return(%w[lettings_support_download_23_24.csv lettings_support_download_24_25.csv lettings_user_download_23_24.csv lettings_user_download_24_25.csv sales_support_download_23_24.csv sales_support_download_24_25.csv sales_user_download_23_24.csv sales_user_download_24_25.csv])
+      allow(service).to receive(:process_file)
+    end
+
+    it "processes each file in the directory" do
+      service.call
+      %w[lettings_support_download_23_24.csv lettings_support_download_24_25.csv lettings_user_download_23_24.csv lettings_user_download_24_25.csv sales_support_download_23_24.csv sales_support_download_24_25.csv sales_user_download_23_24.csv sales_user_download_24_25.csv].each do |file|
+        expect(service).to have_received(:process_file).with(file)
+      end
+    end
+  end
+
+  describe "#process_file" do
+    let(:file) { "spec/fixtures/variable_definitions/lettings_user_download_23_24.csv" }
+    let(:csv_content) { [["id", "Log ID"], ["status", "Status of log"], ["duplicate_set_id", "ID of a set of duplicate logs"]] }
+
+    before do
+      allow(CSV).to receive(:foreach).and_yield(csv_content[0]).and_yield(csv_content[1]).and_yield(csv_content[2])
+    end
+
+    context "when no existing record" do
+      it "creates new records" do
+        expect {
+          service.send(:process_file, file)
+        }.to change(CsvVariableDefinition, :count).by(3)
+      end
+    end
+
+    context "when existing record with user_type support" do
+      let!(:existing_record) { create(:csv_variable_definition, variable: "id", definition: "Log ID", log_type: "lettings", user_type: "support") }
+
+      it "updates the user_type to user" do
+        service.send(:process_file, file)
+        expect(existing_record.reload.user_type).to eq("user")
+      end
+    end
+
+    context "when existing record with user_type user" do
+      let!(:existing_record) { create(:csv_variable_definition, variable: "id", definition: "Log ID", log_type: "lettings", user_type: "user") }
+
+      it "does not update the user_type" do
+        service.send(:process_file, file)
+        expect(existing_record.reload.user_type).to eq("user")
+      end
+    end
+  end
+end