test if @EnableDiscoveryClient is NOT used that NoopDiscoveryClient gets created

src/test/java/org/springframework/cloud/client/discovery/NoopDiscoveryClientImportSelectorTests.java

@@ -0,0 +1,37 @@
+package org.springframework.cloud.client.discovery;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import static org.junit.Assert.*;
+
+/**
+ * Tests if @EnableDiscoveryClient is NOT used, then NoopDiscoveryClient is created.
+ * @author Spencer Gibb
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = NoopDiscoveryClientImportSelectorTests.App.class)
+public class NoopDiscoveryClientImportSelectorTests {
+
+	@Autowired
+	DiscoveryClient discoveryClient;
+
+	@Test
+	public void testDiscoveryClientIsNoop() {
+		assertTrue("discoveryClient is wrong instance type", discoveryClient instanceof NoopDiscoveryClient);
+	}
+
+	@EnableAutoConfiguration
+	@Configuration
+	public static class App {
+		public static void main(String[] args) {
+			SpringApplication.run(App.class, args);
+		}
+	}
+}