diff --git a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
index 7bb4e7f..b75e817 100644
--- a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
+++ b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
@@ -33,11 +33,19 @@ describe("ApiBasedRepositoryLoader", () => {
 
   describe("fetchAndUpdateSystemData", () => {
     it("updates system data in repository if response received", async () => {
+      // Arrange
+      const systemsToPrune = generateMockSystems();
+      await Promise.all(systemsToPrune.map(async (system) => {
+        await loader.repository.addOrUpdateSystem(system);
+      }));
+
       const numberOfSystemsInResponse = fetchSystemDataSuccessfulResponse.all.length;
       updateGlobalFetchMockJson(fetchSystemDataSuccessfulResponse);
 
+      // Act
       await loader.fetchAndUpdateSystemData();
 
+      // Assert
       const systems = await loader.repository.getSystems();
       if (loader.supportedSystemIds.length < numberOfSystemsInResponse) {
         expect(systems).toHaveLength(loader.supportedSystemIds.length);