- GET /features/{id} added and tested on controller level

src/main/java/click/poweronoff/satellite/api/FeaturesController.java

@@ -4,10 +4,13 @@ package click.poweronoff.satellite.api;
 import click.poweronoff.satellite.domain.Feature;
 import click.poweronoff.satellite.service.DataService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.server.ResponseStatusException;
 
 import java.util.List;
 
@@ -18,9 +21,15 @@ public class FeaturesController {
     DataService dataService;
 
     @RequestMapping(value = "/features", method = RequestMethod.GET, produces = "application/json")
-    public @ResponseBody
-    List<Feature> features() {
+    @ResponseBody
+    public List<Feature> features() {
         return dataService.getAllFeatures();
     }
 
+    @RequestMapping(value = "/features/{id}", method = RequestMethod.GET, produces = "application/json")
+    @ResponseBody
+    public Feature featureById(@PathVariable String id) {
+        return dataService.getFeature(id).orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "Unable to find feature"));
+    }
+
 }

src/main/java/click/poweronoff/satellite/service/DataService.java

@@ -3,6 +3,7 @@ package click.poweronoff.satellite.service;
 import click.poweronoff.satellite.domain.Feature;
 
 import java.util.List;
+import java.util.Optional;
 
 public interface DataService {
 
@@ -17,9 +18,11 @@ public interface DataService {
      * returned specific Feature by given id
      *
      * @param featureId feature id
-     * @return Feature
+     * @return Optional of Feature in case of the feature can be
+     * found
+     * or an empty Optional
      */
-    Feature getFeature(final String featureId);
+    Optional<Feature> getFeature(final String featureId);
 
 
     /**

src/main/java/click/poweronoff/satellite/service/DataServiceImpl.java

@@ -3,18 +3,20 @@ package click.poweronoff.satellite.service;
 import click.poweronoff.satellite.domain.Feature;
 import org.springframework.stereotype.Component;
 
+import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 
 @Component
 public class DataServiceImpl implements DataService {
 
     public List<Feature> getAllFeatures() {
-        return null;
+        return Collections.emptyList();
     }
 
     @Override
-    public Feature getFeature(String featureId) {
-        return null;
+    public Optional<Feature> getFeature(String featureId) {
+        return Optional.empty();
     }
 
     @Override

src/test/java/click/poweronoff/satellite/api/FeaturesControllerTest.java

@@ -7,11 +7,14 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.MediaType;
 import org.springframework.test.web.servlet.MockMvc;
 
 import java.util.List;
+import java.util.Optional;
 
 import static org.hamcrest.Matchers.is;
+import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.when;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
@@ -33,7 +36,7 @@ public class FeaturesControllerTest {
         when(dataService.getAllFeatures()).thenReturn(List.of(new Feature("feature-id", 123L, 234L, 345L, "mission")));
         this.mockMvc.perform(get("/features")).andDo(print())
                 .andExpect(status().isOk())
-                .andExpect(content().contentType("application/json"))
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON))
                 .andExpect(jsonPath("$[0].id").exists())
                 .andExpect(jsonPath("$[0].id", is("feature-id")))
                 .andExpect(jsonPath("$[0].timestamp", is(123)))
@@ -43,4 +46,20 @@ public class FeaturesControllerTest {
                 );
     }
 
+    @Test
+    public void getFeatureByIdShouldReturnAMessage() throws Exception {
+        when(dataService.getFeature(anyString())).thenReturn(Optional.of(new Feature("feature-id", 123L, 234L, 345L, "mission")));
+        this.mockMvc.perform(get("/features/feature-id"))
+                .andExpect(status().isOk())
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON));
+    }
+
+    @Test
+    public void getFeatureByIdShouldReturnNotFound() throws Exception {
+        when(dataService.getFeature(anyString())).thenReturn(Optional.empty());
+        this.mockMvc.perform(get("/features/non-existing-feature"))
+                .andExpect(status().isNotFound());
+    }
+
+
 }