Signed-off-by: Margi212 add test cases.

docling-testing/docling-version-tests/src/test/java/ai/docling/client/tester/client/RegistryClientFactoryTests.java

@@ -0,0 +1,82 @@
+package ai.docling.client.tester.client;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.Mockito.mock;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import ai.docling.client.tester.client.ghcr.GHCRClient;
+
+class RegistryClientFactoryTests {
+
+    private GHCRClient ghcrClient;
+    private RegistryClientFactory factory;
+
+    @BeforeEach
+    void setUp() {
+        ghcrClient = mock(GHCRClient.class);
+        factory = new RegistryClientFactory(ghcrClient);
+    }
+
+    @Test
+    void shouldReturnGHCRClientForGhcrRegistry() {
+        var client = factory.getRegistryClient("ghcr.io");
+
+        assertThat(client)
+                .isNotNull()
+                .isSameAs(ghcrClient);
+    }
+
+    @Test
+    void shouldThrowExceptionForUnsupportedRegistry() {
+        assertThatThrownBy(() -> factory.getRegistryClient("docker.io"))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("Unsupported registry: docker.io");
+    }
+
+    @Test
+    void shouldThrowExceptionForNullRegistry() {
+        assertThatThrownBy(() -> factory.getRegistryClient(null))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("Unsupported registry: null");
+    }
+
+    @Test
+    void shouldThrowExceptionForEmptyRegistry() {
+        assertThatThrownBy(() -> factory.getRegistryClient(""))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("Unsupported registry: ");
+    }
+
+    @Test
+    void shouldThrowExceptionForUnknownRegistry() {
+        assertThatThrownBy(() -> factory.getRegistryClient("quay.io"))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("Unsupported registry: quay.io");
+    }
+
+    @Test
+    void shouldThrowExceptionForRegistryWithDifferentCase() {
+        // Registry names are case-sensitive
+        assertThatThrownBy(() -> factory.getRegistryClient("GHCR.IO"))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("Unsupported registry: GHCR.IO");
+    }
+
+    @Test
+    void shouldThrowExceptionForRegistryWithWhitespace() {
+        assertThatThrownBy(() -> factory.getRegistryClient(" ghcr.io "))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessage("Unsupported registry:  ghcr.io ");
+    }
+
+    @Test
+    void shouldReturnSameClientInstanceOnMultipleCalls() {
+        var client1 = factory.getRegistryClient("ghcr.io");
+        var client2 = factory.getRegistryClient("ghcr.io");
+
+        assertThat(client1).isSameAs(client2);
+    }
+}