Add test caching user keys service.

Author: chenkins

hub/src/test/java/ch/iterate/hub/workflows/CachingUserKeysServiceTest.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2025 shift7 GmbH. All rights reserved.
+ */
+
+package ch.iterate.hub.workflows;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import ch.iterate.hub.client.ApiException;
+import ch.iterate.hub.crypto.UserKeys;
+import ch.iterate.hub.workflows.exceptions.AccessException;
+import ch.iterate.hub.workflows.exceptions.SecurityFailure;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.times;
+
+class CachingUserKeysServiceTest {
+
+    @Test
+    void testGetUserKeys() throws AccessException, SecurityFailure, ApiException {
+        final UserKeysService proxyMock = Mockito.mock(UserKeysService.class);
+        final UserKeys userKeys = UserKeys.create();
+        Mockito.when(proxyMock.getUserKeys(any(), any())).thenReturn(userKeys);
+        final CachingUserKeysService service = new CachingUserKeysService(proxyMock);
+        assertEquals(userKeys, service.getUserKeys(null, null));
+        Mockito.verify(proxyMock, times(1)).getUserKeys(any(), any());
+        assertEquals(userKeys, service.getUserKeys(null, null));
+        Mockito.verify(proxyMock, times(1)).getUserKeys(any(), any());
+    }
+}