MockMVC test with Mockito

src/main/java/guru/springframework/spring6restmvc/controller/BeerController.java

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+package guru.springframework.spring6restmvc.controller;
+
+import guru.springframework.spring6restmvc.model.Beer;
+import guru.springframework.spring6restmvc.services.BeerService;
+import lombok.AllArgsConstructor;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.UUID;
+
+@RequiredArgsConstructor
+@RestController
+public class BeerController {
+
+    public static final String BEER_PATH="/api/v1/beer";
+    public  static final String BEER_PATH_ID=BEER_PATH+ "/{beerId}";
+
+    private final BeerService beerService;
+
+    @PatchMapping(BEER_PATH_ID)
+    public ResponseEntity patchBeer(@RequestBody Beer beer,@PathVariable("beerId") UUID beerId) {
+        beerService.patchBeerById(beerId,beer);
+      return new ResponseEntity(HttpStatus.NO_CONTENT);
+    }
+
+    @DeleteMapping(BEER_PATH_ID)
+    public ResponseEntity DeleteBeer(@PathVariable("beerId") UUID beerId){
+        beerService.deleteBeerById(beerId);
+        return new ResponseEntity(HttpStatus.NO_CONTENT);
+    }
+    @PutMapping(BEER_PATH_ID)
+    public ResponseEntity updateBeer(@RequestBody Beer beer,@PathVariable("beerId") UUID beerId){
+        beerService.updateBeer(beer,beerId);
+     return new ResponseEntity(HttpStatus.NO_CONTENT);
+    }
+
+    @PostMapping(BEER_PATH)
+    public ResponseEntity saveNewBeer(@RequestBody Beer beer){
+        Beer savedBeer=beerService.save(beer);
+        HttpHeaders header=new HttpHeaders();
+        header.add("Location",BEER_PATH + savedBeer.getId().toString());
+        return new ResponseEntity(header,HttpStatus.CREATED);
+    }
+
+    @GetMapping(BEER_PATH)
+    public List<Beer> listBeers(){
+        return beerService.listBeers();
+    }
+
+    @GetMapping(BEER_PATH_ID)
+    public Beer getById(@PathVariable("beerId")UUID beerId){
+
+        return beerService.getById(beerId);
+    }
+
+}

src/main/java/guru/springframework/spring6restmvc/controller/CustomerController.java

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+package guru.springframework.spring6restmvc.controller;
+
+import guru.springframework.spring6restmvc.model.Customer;
+import guru.springframework.spring6restmvc.services.CustomerService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.UUID;
+
+@RequiredArgsConstructor
+@RestController
+public class CustomerController {
+
+    public static final String CUSTOMER_PATH= "/api/v1/customer";
+    public static final String CUSTOMER_PATH_ID= CUSTOMER_PATH+ "/{customerId}";
+    private final CustomerService customerService;
+    @DeleteMapping(CUSTOMER_PATH_ID)
+    public ResponseEntity deleteById(@PathVariable("customerId") UUID customerId){
+        customerService.deleteById(customerId);
+        return new ResponseEntity(HttpStatus.NO_CONTENT);
+    }
+
+    @PutMapping(CUSTOMER_PATH_ID)
+    public ResponseEntity updateCustomer(@PathVariable("customerId") UUID customerId, @RequestBody Customer customer){
+         customerService.updateCustomerById(customer, customerId);
+        return new ResponseEntity(HttpStatus.NO_CONTENT);
+    }
+    @PostMapping(CUSTOMER_PATH)
+    public ResponseEntity saveCustomer(@RequestBody Customer customer){
+         Customer savedCustomer= customerService.saveCustomer(customer);
+         HttpHeaders header=new HttpHeaders();
+         header.add("Location",CUSTOMER_PATH+ savedCustomer.getId().toString());
+        return new ResponseEntity(header, HttpStatus.CREATED);
+    }
+
+    @GetMapping(CUSTOMER_PATH)
+    public List<Customer> listCustomers(){
+        return  customerService.listCustomers();
+    }
+    @GetMapping(CUSTOMER_PATH_ID)
+    public Customer getById(@PathVariable("customerId") UUID customerId){
+
+        return customerService.getById(customerId);
+    }
+
+
+}

src/main/java/guru/springframework/spring6restmvc/model/Beer.java

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+package guru.springframework.spring6restmvc.model;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Builder
+@Data
+public class Beer {
+    private UUID id;
+    private Integer version;
+    private String beerName;
+    private BeerStyle beerStyle;
+    private String upc;
+    private Integer quantityOnHand;
+    private BigDecimal price;
+    private LocalDateTime createdDate;
+    private LocalDateTime updateDate;
+}

src/main/java/guru/springframework/spring6restmvc/model/BeerStyle.java

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+package guru.springframework.spring6restmvc.model;
+
+public enum BeerStyle {
+    LAGER, PILSNER, STOUT, GOSE, PORTER, ALE, WHEAT, IPA, PALE_ALE, SAISON
+}

src/main/java/guru/springframework/spring6restmvc/model/Customer.java

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+package guru.springframework.spring6restmvc.model;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.util.UUID;
+
+@Data
+@Builder
+public class Customer {
+
+    private UUID Id;
+    private String customerName;
+    private BigDecimal version;
+    private LocalDate createdDate;
+    private LocalDate lastModifiedDate;
+
+
+
+}

src/main/java/guru/springframework/spring6restmvc/services/BeerService.java

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+package guru.springframework.spring6restmvc.services;
+
+import guru.springframework.spring6restmvc.model.Beer;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface BeerService {
+
+    Beer getById(UUID Id);
+    List <Beer> listBeers();
+
+    Beer save(Beer beer);
+
+    void updateBeer(Beer beer, UUID beerId);
+
+    void deleteBeerById(UUID beerId);
+
+    void patchBeerById(UUID beerId, Beer beer);
+}

src/main/java/guru/springframework/spring6restmvc/services/BeerServiceImpl.java

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+package guru.springframework.spring6restmvc.services;
+
+import guru.springframework.spring6restmvc.model.Beer;
+import guru.springframework.spring6restmvc.model.BeerStyle;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.*;
+
+@Service
+public class BeerServiceImpl implements BeerService {
+    private Map<UUID,Beer> beerMap;
+
+    public BeerServiceImpl(){
+        this.beerMap= new HashMap<>();
+
+        Beer beer1=Beer.builder()
+                .id(UUID.randomUUID())
+                .upc("h")
+                .price(new BigDecimal(12.3))
+                .version(2)
+                .beerName("asmara beer")
+                .quantityOnHand(123)
+                .beerStyle(BeerStyle.ALE)
+                .createdDate(LocalDateTime.now())
+                .updateDate(LocalDateTime.now())
+                .build();
+
+        Beer beer2=Beer.builder()
+                .id(UUID.randomUUID())
+                .upc("h")
+                .price(new BigDecimal(12.3))
+                .version(2)
+                .beerName("asmara beer")
+                .quantityOnHand(123)
+                .beerStyle(BeerStyle.ALE)
+                .createdDate(LocalDateTime.now())
+                .updateDate(LocalDateTime.now())
+                .build();
+
+        Beer beer3=Beer.builder()
+                .id(UUID.randomUUID())
+                .upc("h")
+                .price(new BigDecimal(12.3))
+                .version(2)
+                .beerName("asmara beer")
+                .quantityOnHand(123)
+                .beerStyle(BeerStyle.ALE)
+                .createdDate(LocalDateTime.now())
+                .updateDate(LocalDateTime.now())
+                .build();
+        beerMap.put(beer1.getId(),beer1);
+        beerMap.put(beer2.getId(),beer2);
+        beerMap.put(beer3.getId(),beer3);
+    }
+
+    @Override
+    public Beer getById(UUID Id) {
+        return beerMap.get(Id);
+    }
+
+    @Override
+    public List<Beer> listBeers(){
+        return new  ArrayList<>(beerMap.values());
+    }
+
+    @Override
+    public Beer save(Beer beer) {
+
+        Beer savedBeer=Beer.builder()
+                .id(UUID.randomUUID())
+                .upc(beer.getUpc())
+                .price(new BigDecimal(12.3))
+                .version(2)
+                .beerName(beer.getBeerName())
+                .quantityOnHand(123)
+                .beerStyle(BeerStyle.ALE)
+                .createdDate(LocalDateTime.now())
+                .updateDate(LocalDateTime.now())
+                .build();
+          beerMap.put(savedBeer.getId(),savedBeer);
+        return savedBeer;
+    }
+
+    @Override
+    public void updateBeer(Beer beer, UUID beerId) {
+         Beer existingBeer=beerMap.get(beerId);
+         existingBeer.setBeerName(beer.getBeerName());
+         existingBeer.setPrice(beer.getPrice());
+    }
+
+    @Override
+    public void deleteBeerById(UUID beerId) {
+        beerMap.remove(beerId);
+    }
+
+    @Override
+    public void patchBeerById(UUID beerId, Beer beer) {
+        Beer existing = beerMap.get(beerId);
+
+        if (StringUtils.hasText(beer.getBeerName())) {
+            existing.setBeerName(beer.getBeerName());
+        }
+
+        if (beer.getBeerStyle() != null) {
+            existing.setBeerStyle(beer.getBeerStyle());
+        }
+
+        if (beer.getPrice() != null) {
+            existing.setPrice(beer.getPrice());
+        }
+
+        if (beer.getQuantityOnHand() != null) {
+            existing.setQuantityOnHand(beer.getQuantityOnHand());
+        }
+
+    }
+
+
+}

src/main/java/guru/springframework/spring6restmvc/services/CustomerService.java

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+package guru.springframework.spring6restmvc.services;
+
+import guru.springframework.spring6restmvc.model.Customer;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface CustomerService {
+
+
+    List<Customer> listCustomers();
+    Customer getById(UUID Id);
+
+    Customer saveCustomer(Customer customer);
+
+    void deleteById(UUID customerId);
+
+    void patchCustomerById(UUID customerId, Customer customer);
+
+    void updateCustomerById(Customer customer,UUID customerId);
+}