Test case for Feign client example

Spring-Boot/spring-feign/feign-client-example/src/test/java/com/javadevjournal/feignclient/FeignClientApplicationTests.java

@@ -1,16 +0,0 @@
-package com.javadevjournal.feignclient;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.test.context.junit4.SpringRunner;
-
-@RunWith(SpringRunner.class)
-@SpringBootTest
-public class FeignClientApplicationTests {
-
-	@Test
-	public void contextLoads() {
-	}
-
-}

Spring-Boot/spring-feign/feign-client-example/src/test/java/com/javadevjournal/feignclientexample/FeignClientApplicationTests.java

@@ -0,0 +1,61 @@
+package com.javadevjournal.feignclientexample;
+
+import static org.mockito.BDDMockito.given;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import com.javadevjournal.feignclientexample.errors.ProductNotFoundException;
+
+@RunWith(SpringRunner.class)
+@WebMvcTest(AppController.class)
+public class FeignClientApplicationTests {
+
+  @Autowired
+  private MockMvc mvc;
+
+  @MockBean
+  private ProductServiceClient productServiceClient;
+
+
+  @Test
+  public void shouldReturnListOfProducts_whenFetchProductsCalled() throws Exception {
+
+    List<Product> products = new ArrayList<Product>();
+    products.add(new Product(1, "product-1", 12.0));
+    products.add(new Product(2, "product-2", 22.0));
+    given(productServiceClient.getAllProducts()).willReturn(products);
+    MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/fetchProducts");
+
+    mvc.perform(builder).andExpect(status().isOk());
+  }
+
+  @Test
+  public void shouldReturnProduct_whenvalidProductIdIsPassed() throws Exception {
+
+    Product product = new Product(1, "product-1", 12.0);
+    given(productServiceClient.getProduct(1)).willReturn(product);
+    MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/fetchProduct/" + 1);
+
+    mvc.perform(builder).andExpect(status().isOk());
+  }
+
+  @Test
+  public void shouldThrowException_whenInvalidProductIdPassed() throws Exception {
+
+    given(productServiceClient.getProduct(2))
+        .willThrow(new ProductNotFoundException("Id not found"));
+    MockHttpServletRequestBuilder builder = MockMvcRequestBuilders.get("/fetchProduct/" + 2);
+
+    mvc.perform(builder).andExpect(status().isNotFound());
+  }
+
+}