Adds implementation for getItemById, findById, and some debugging in …

src/main/java/com/mrxgrc/inventory/controller/ItemController.java

@@ -2,7 +2,9 @@
 
 import com.mrxgrc.inventory.model.Item;
 import com.mrxgrc.inventory.service.ItemService;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RestController;
 
 import java.util.List;
@@ -20,4 +22,15 @@ public ItemController(ItemService itemService) {
     public List<Item> getItems() {
         return itemService.getAllItems();
     }
+
+    @GetMapping("/items/{requestedId}")
+    public ResponseEntity<Item> getItemById(@PathVariable Long requestedId) {
+        // Call itemService.findById(requestedId) and return the appropriate response entity
+        Item item = itemService.findById(requestedId);
+         if (item == null) {
+             return ResponseEntity.notFound().build();
+         } else {
+             return ResponseEntity.ok(item);
+         }
+    }
 }

src/main/java/com/mrxgrc/inventory/model/Item.java

@@ -1,17 +1,17 @@
 package com.mrxgrc.inventory.model;
 
 public class Item {
-    private int id;
+    private Long id;
     private String name;
 
     // Constructor
-    public Item(int id, String name) {
+    public Item(Long id, String name) {
         this.id = id;
         this.name = name;
     }
 
     // Getters
-    public int getId() {
+    public Long getId() {
         return id;
     }
     public String getName() {

src/main/java/com/mrxgrc/inventory/service/ItemService.java

@@ -12,17 +12,24 @@ public class ItemService {
 
     // Constructor
     public ItemService() {
-        items.add(new Item(1, "Hand Soap"));
-        items.add(new Item(2, "Hand Sanitizer"));
-        items.add(new Item(3, "Toilet Paper"));
+        items.add(new Item(1L, "Hand Soap"));
+        items.add(new Item(2L, "Hand Sanitizer"));
+        items.add(new Item(3L, "Toilet Paper"));
     }
 
     public List<Item> getAllItems() {
-
         List<Item> result = new ArrayList<>();
         for (Item item : items) {
             result.add(item);
         }
         return result;
     }
+
+    public Item findById(Long requestedId) {
+        // Retrieve the item with the given ID from list
+        return items.stream()
+                .filter(item -> item.getId().equals(requestedId))
+                .findFirst()
+                .orElse(null);
+    }
 }

src/test/java/com/mrxgrc/inventory/ItemControllerTest.java

@@ -7,7 +7,7 @@
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
 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 org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
@@ -37,7 +37,15 @@ public void getItemsReturnsListofItems() throws Exception{
                 .andExpect(jsonPath("$[*].name").isNotEmpty())
                 // Optionally: ensure name fields are strings
                 .andExpect(jsonPath("$[*].name", everyItem(instanceOf(String.class))));
+    }
 
-
+    // request an item by id, expect json with correct id + name. This is an integration test.
+    @Test
+    public void getItemByIdReturnsItem() throws Exception {
+        this.mockMvc.perform(get("/items/1").accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(content().contentType(MediaType.APPLICATION_JSON))
+                .andExpect(jsonPath("$.id", equalTo(1)))
+                .andExpect(jsonPath("$.name", equalTo("Hand Soap")));
     }
 }