Updated tests with builder and paramters

app/Bookstore.Domain.Tests/BookTests.cs

@@ -1,39 +1,43 @@
 using Bookstore.Domain.Books;
+using Bookstore.Domain.Tests.Builders;
 
 namespace Bookstore.Domain.Tests
 {
     public class BookTests
     {
-        [Fact]
-        public void IsInStock_ReturnsTrue_When_QuantityIsGreaterThanZero()
+        [Theory]
+        [InlineData(1, true)]
+        [InlineData(0, false)]
+        public void IsInStock_ReturnsTrue_When_QuantityIsGreaterThanZero(int quantity, bool expectedResult)
         {
-            var book = new Book("Test", "Test", "1234567890123", 1, 1, 1, 1, 1, 1);
-            Assert.True(book.IsInStock);
-
-            book = new Book("Test", "Test", "1234567890123", 1, 1, 1, 1, 1, 0);
-            Assert.False(book.IsInStock);
+            var book = new BookBuilder()
+                .Quantity(quantity)
+                .Build();
+
+            Assert.Equal(expectedResult, book.IsInStock);
         }
 
-        [Fact]
-        public void IsLowInStock_ReturnsTrue_When_QuantityIsLessThanOrEqualToThreshold()
+        [Theory]
+        [InlineData(Book.LowBookThreshold - 1, true)]
+        [InlineData(Book.LowBookThreshold, true)]
+        [InlineData(Book.LowBookThreshold + 1, false)]
+        public void IsLowInStock_ReturnsTrue_When_QuantityIsLessThanOrEqualToThreshold(int quantity, bool expectedResult)
         {
-            var threshold = Book.LowBookThreshold;
-
-            var book = new Book("Test", "Test", "1234567890123", 1, 1, 1, 1, 1, threshold - 1);
-            Assert.True(book.IsLowInStock);
-
-            book = new Book("Test", "Test", "1234567890123", 1, 1, 1, 1, 1, threshold);
-            Assert.True(book.IsLowInStock);
-
-            book = new Book("Test", "Test", "1234567890123", 1, 1, 1, 1, 1, threshold + 1);
-            Assert.False(book.IsLowInStock);
+            var book = new BookBuilder()
+                .Quantity(quantity)
+                .Build();
+
+            Assert.Equal(expectedResult, book.IsLowInStock);
         }
 
         [Fact]
         public void ReduceStockLevel_ReducesQuantityBySpecifiedAmount_When_Executed()
         {
-            var book = new Book("Test", "Test", "1234567890123", 1, 1, 1, 1, 1, 100);
-            var amountToReduce = 50;
+            var book = new BookBuilder()
+                .Quantity(100)
+                .Build();
+
+            const int amountToReduce = 50;
             var expectedQuantity = book.Quantity - amountToReduce;
 
             book.ReduceStockLevel(amountToReduce);
@@ -44,12 +48,15 @@ public void ReduceStockLevel_ReducesQuantityBySpecifiedAmount_When_Executed()
         [Fact]
         public void ReduceStockLevel_DoesNotReduceQuantityBelowZero_When_Executed()
         {
-            var book = new Book("Test", "Test", "1234567890123", 1, 1, 1, 1, 1, 50);
-            var amountToReduce = 60;
+            var book = new BookBuilder()
+                .Quantity(50)
+                .Build();
+
+            const int amountToReduce = 60;
 
             book.ReduceStockLevel(amountToReduce);
 
-            Assert.True(book.Quantity == 0);
+            Assert.Equal(0, book.Quantity);
         }
     }
 }

app/Bookstore.Domain.Tests/Builders/BookBuilder.cs

@@ -0,0 +1,97 @@
+using Bookstore.Domain.Books;
+
+namespace Bookstore.Domain.Tests.Builders;
+
+public class BookBuilder
+{
+    private string name = "test";
+    private string author = "author";
+    private string isbn = "12345678";
+    private int publisherId = 1;
+    private int bookTypeId = 2;
+    private int genreId = 3;
+    private int conditionId = 4;
+    private decimal price = 5;
+    private int quantity = 6;
+    private int? year = 2000;
+    private string? summary = "book summary";
+    private string? coverImageUrl = "http://cover.dummy";
+
+    public Book Build()
+    {
+        return new Book(name, author, isbn, publisherId, bookTypeId, genreId, conditionId, price, quantity, year,
+            summary, coverImageUrl);
+    }
+
+    public BookBuilder Name(string value)
+    {
+        name = value;
+        return this;
+    }
+
+    public BookBuilder Author(string value)
+    {
+        author = value;
+        return this;
+    }   
+
+    public BookBuilder ISBN(string value)
+    {
+        isbn = value;
+        return this;
+    }    
+
+    public BookBuilder PublisherId(int value)
+    {
+        publisherId = value;
+        return this;
+    } 
+
+    public BookBuilder BookTypeId(int value)
+    {
+        bookTypeId = value;
+        return this;
+    } 
+
+    public BookBuilder GenreId(int value)
+    {
+        genreId = value;
+        return this;
+    } 
+
+    public BookBuilder ConditionId(int value)
+    {
+        conditionId = value;
+        return this;
+    }  
+
+    public BookBuilder Price(decimal value)
+    {
+        price = value;
+        return this;
+    }
+
+    public BookBuilder Quantity(int value)
+    {
+        quantity = value;
+        return this;
+    } 
+
+    public BookBuilder Year(int? value)
+    {
+        year = value;
+        return this;
+    }    
+
+    public BookBuilder Summary(string? value)
+    {
+        summary = value;
+        return this;
+    }   
+
+    public BookBuilder CoverImageUrl(string? value)
+    {
+        coverImageUrl = value;
+        return this;
+    } 
+}