Add test for default target resolution in DefaultGrpcChannelFactoryTests

Signed-off-by: Andrey Litvitski <andrey1010102008@gmail.com>

Author: therepanic

spring-grpc-core/src/test/java/org/springframework/grpc/client/DefaultGrpcChannelFactoryTests.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2023-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.grpc.client;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests for {@link DefaultGrpcChannelFactory}.
+ *
+ * @author Andrey Litvitski
+ */
+class DefaultGrpcChannelFactoryTests {
+
+	@Test
+	void defaultTargetResolvesToLocalhost() {
+		var factory = new DefaultGrpcChannelFactory<>(List.of(), mock());
+		assertThat(factory.targets).isSameAs(VirtualTargets.DEFAULT);
+		assertThat(factory.targets.getTarget("default")).isEqualTo("localhost:9090");
+	}
+
+}