Add PetDataset class

src/test/java/es/uvigo/esei/daa/dataset/PetDataset.java

+package es.uvigo.esei.daa.dataset;
+
+import static java.util.Arrays.binarySearch;
+import static java.util.Arrays.stream;
+
+import java.util.Arrays;
+import java.util.function.Predicate;
+
+import es.uvigo.esei.daa.entities.Pet;
+
+public final class PetDataset {
+	private PetDataset() {}
+	
+	public static Pet[] pets() {
+		return new Pet[] {
+			new Pet(1, "Jimminy", 1),
+			new Pet(2, "Cisco", 2),
+			new Pet(3, "Phoenix", 3),
+			new Pet(4, "Rocky", 3),
+			new Pet(5, "Tallulah", 4)
+		};
+	}
+	
+	
+	
+	
+	public static Pet[] petWithout(int ... ids) {
+		Arrays.sort(ids);
+		
+		final Predicate<Pet> hasValidId = Pet ->
+			binarySearch(ids, Pet.getIdPet()) < 0;
+		
+		return stream(pets())
+			.filter(hasValidId)
+		.toArray(Pet[]::new);
+	}
+	
+	public static Pet Pet(int id) {
+		return stream(pets())
+			.filter(Pet -> Pet.getIdPet() == id)
+			.findAny()
+		.orElseThrow(IllegalArgumentException::new);
+	}
+	
+	public static int existentId() {
+		return 5;
+	}
+	
+	public static int nonExistentId() {
+		return 1234;
+	}
+
+	public static Pet existentPet() {
+		return Pet(existentId());
+	}
+	
+	public static Pet nonExistentPet() {
+		return new Pet(nonExistentId(), "Jane", 4);
+	}
+	
+	public static String newName() {
+		return "John";
+	}
+	
+	public static int newIdMaster() {
+		return 12;
+	}
+	
+	public static Pet newPet() {
+		return new Pet(pets().length + 1, newName(), newIdMaster());
+	}
+}
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