Add Singha with tests

src/main/java/ch/heigvd/res/chill/domain/Diluckshan/Singha.java

@@ -0,0 +1,21 @@
+package ch.heigvd.res.chill.domain.Diluckshan;
+
+import ch.heigvd.res.chill.domain.IProduct;
+
+import java.math.BigDecimal;
+
+public class Singha implements IProduct {
+
+  public final static String NAME = "singha";
+  public final static BigDecimal PRICE = new BigDecimal(6.2);
+
+  @Override
+  public String getName() {
+    return NAME;
+  }
+
+  @Override
+  public BigDecimal getPrice() {
+    return PRICE;
+  }
+}

src/test/java/ch/heigvd/res/chill/domain/Diluckshan/SinghaTest.java

@@ -0,0 +1,32 @@
+package ch.heigvd.res.chill.domain.Diluckshan;
+
+import ch.heigvd.res.chill.domain.Bartender;
+import ch.heigvd.res.chill.domain.Diluckshan.Singha;
+import ch.heigvd.res.chill.protocol.OrderRequest;
+import ch.heigvd.res.chill.protocol.OrderResponse;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SinghaTest {
+
+  @Test
+  void thePriceAndNameForSinghaShouldBeCorrect() {
+    Singha beer = new Singha();
+    assertEquals(beer.getName(), Singha.NAME);
+    assertEquals(beer.getPrice(), Singha.PRICE);
+  }
+
+  @Test
+  void aBartenderShouldAcceptAnOrderForSingha() {
+    Bartender jane = new Bartender();
+    String productName = "ch.heigvd.res.chill.domain.Diluckshan.Singha";
+    OrderRequest request = new OrderRequest(3, productName);
+    OrderResponse response = jane.order(request);
+    BigDecimal expectedTotalPrice = Singha.PRICE.multiply(new BigDecimal(3));
+    assertEquals(expectedTotalPrice, response.getTotalPrice());
+  }
+
+}