test: add null parameter validation tests

Co-authored-by: Oleksandr Klymenko <alexanderklmn@gmail.com>
Signed-off-by: Oleksandr Klymenko <alexanderklmn@gmail.com>

Author: alxkm

models/spring-ai-azure-openai/src/test/java/org/springframework/ai/azure/openai/aot/AzureOpenAiRuntimeHintsTests.java

@@ -31,6 +31,7 @@
 import org.springframework.aot.hint.TypeReference;
 
 import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
 import static org.springframework.aot.hint.predicate.RuntimeHintsPredicates.reflection;
 import static org.springframework.aot.hint.predicate.RuntimeHintsPredicates.resource;
 
@@ -209,4 +210,11 @@ void verifyEnumTypesInAzurePackageAreRegistered() {
 		assertThat(hasEnumTypes).as("Azure OpenAI enum types should be registered").isTrue();
 	}
 
+	@Test
+	void registerHintsWithNullRuntimeHints() {
+		// Should throw when RuntimeHints is null
+		assertThatThrownBy(() -> this.azureOpenAiRuntimeHints.registerHints(null, null))
+			.isInstanceOf(NullPointerException.class);
+	}
+
 }

models/spring-ai-transformers/src/test/java/org/springframework/ai/transformers/ResourceCacheServiceTests.java

@@ -27,6 +27,7 @@
 import org.springframework.core.io.DefaultResourceLoader;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /**
  * @author Christian Tzolov
@@ -109,4 +110,12 @@ public void cacheHttpResources() throws IOException {
 		assertThat(Files.list(Files.list(this.tempDir.toPath()).iterator().next()).count()).isEqualTo(1);
 	}
 
+	@Test
+	public void shouldHandleNullUri() {
+		var cache = new ResourceCacheService(this.tempDir);
+
+		assertThatThrownBy(() -> cache.getCachedResource((String) null)).isInstanceOf(IllegalArgumentException.class)
+			.hasMessageContaining("Location must not be null");
+	}
+
 }