Tests that if @EnableDiscoveryClient is used, but there is no implementation on the classpath, then fail

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

@@ -0,0 +1,38 @@
+package org.springframework.cloud.client.discovery;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.NestedRuntimeException;
+
+/**
+ * Tests that if @EnableDiscoveryClient is used, but there is no implementation
+ * on the classpath, then fail
+ * @author Spencer Gibb
+ */
+public class EnableDiscoveryClientMissingImplTests {
+
+	@Test
+	public void testContextFails() {
+		try {
+			new SpringApplicationBuilder()
+					.sources(App.class)
+					.web(false)
+					.run(new String[0]);
+		} catch (NestedRuntimeException e) {
+			Throwable rootCause = e.getRootCause();
+			assertTrue(rootCause instanceof IllegalStateException);
+			assertTrue(rootCause.getMessage().contains("no implementations"));
+		}
+	}
+
+	@EnableAutoConfiguration
+	@Configuration
+	@EnableDiscoveryClient
+	//this will fail with @EnableDiscoveryClient and no implementation (nothing in spring.factories)
+	public static class App {
+	}
+}