Refactor assertions in tests to use Is.Zero and Is.False for improved clarity

Source/QuestPDF.UnitTests/LineTests.cs

@@ -70,7 +70,7 @@ public class LineTests
         container.LineHorizontal(0);
         
         var line = container.Child as Line;
-        Assert.That(line?.Thickness, Is.EqualTo(0));
+        Assert.That(line?.Thickness, Is.Zero);
     }
     
     [Test]
@@ -246,11 +246,11 @@ public class LineTests
         
         var line = container.Child as Line;
         
-        Assert.That(line.GetState(), Is.EqualTo(false));
+        Assert.That(line.GetState(), Is.False);
         line.SetState(true);
-        Assert.That(line.GetState(), Is.EqualTo(true));
+        Assert.That(line.GetState(), Is.True);
         
         line.ResetState();
-        Assert.That(line.GetState(), Is.EqualTo(false));
+        Assert.That(line.GetState(), Is.False);
     }
 }

Source/QuestPDF.UnitTests/PaddingTests.cs

@@ -95,9 +95,9 @@ namespace QuestPDF.UnitTests
             container.PaddingVertical(123);
         
             var rowContainer = container.Child as Padding;
-            Assert.That(rowContainer?.Left, Is.EqualTo(0));
+            Assert.That(rowContainer?.Left, Is.Zero);
             Assert.That(rowContainer?.Top, Is.EqualTo(123));
-            Assert.That(rowContainer?.Right, Is.EqualTo(0));
+            Assert.That(rowContainer?.Right, Is.Zero);
             Assert.That(rowContainer?.Bottom, Is.EqualTo(123));
         }
         
@@ -110,9 +110,9 @@ namespace QuestPDF.UnitTests
         
             var rowContainer = container.Child as Padding;
             Assert.That(rowContainer?.Left, Is.EqualTo(234));
-            Assert.That(rowContainer?.Top, Is.EqualTo(0));
+            Assert.That(rowContainer?.Top, Is.Zero);
             Assert.That(rowContainer?.Right, Is.EqualTo(234));
-            Assert.That(rowContainer?.Bottom, Is.EqualTo(0));
+            Assert.That(rowContainer?.Bottom, Is.Zero);
         }
         
         [Test]

Source/QuestPDF.UnitTests/StyledBoxTests.cs

@@ -657,7 +657,7 @@ public class StyledBoxTests
         container.BorderAlignmentInside();
         
         var styledBox = container.Child as StyledBox;
-        Assert.That(styledBox?.BorderAlignment, Is.EqualTo(0));
+        Assert.That(styledBox?.BorderAlignment, Is.Zero);
     }
     
     [Test]