[java] Enhance PageSize class to support for predefined and custom Paper Sizes

java/src/org/openqa/selenium/print/PageSize.java

@@ -21,15 +21,20 @@
 import java.util.Map;
 
 public class PageSize {
-
   private final double height;
   private final double width;
 
+    // Reference for predefined page size constants: https://www.agooddaytoprint.com/page/paper-size-chart-faq
+    public static final PageSize A4 = new PageSize(29.7, 21.0); // A4 size in cm
+    public static final PageSize LEGAL = new PageSize(35.56, 21.59); // Legal size in cm
+    public static final PageSize TABLOID = new PageSize(43.18, 27.94); // Tabloid size in cm
+    public static final PageSize LETTER = new PageSize(27.94, 21.59); // Letter size in cm
+
   public PageSize() {
     // Initialize with defaults. A4 paper size defaults in cms.
     this.height = 27.94;
     this.width = 21.59;
-  }
+ }
 
   public PageSize(double height, double width) {
     this.height = height;
@@ -51,4 +56,10 @@ public Map<String, Object> toMap() {
 
     return options;
   }
-}
+
+    @Override
+    public String toString() {
+    return "PageSize[width=" + this.getWidth() + ", height=" + this.getHeight() + "]";
+ }
+
+}

java/test/org/openqa/selenium/print/PageSizeTest.java

@@ -36,4 +36,33 @@ void setsDefaultHeightWidth() {
     assertThat(pageSize.getHeight()).isEqualTo(HEIGHT);
     assertThat(pageSize.getWidth()).isEqualTo(WIDTH);
   }
-}
+
+  @Test
+    void verifiesPageSizeA4() {
+    PageSize pageSize = PageSize.A4;
+    assertThat(pageSize.getHeight()).isEqualTo(HEIGHT);
+    assertThat(pageSize.getWidth()).isEqualTo(WIDTH);
+  }
+
+  @Test
+    void verifiesPageSizeLegal() {
+    PageSize pageSize = PageSize.LEGAL;
+    assertThat(pageSize.getHeight()).isEqualTo(HEIGHT);
+    assertThat(pageSize.getWidth()).isEqualTo(WIDTH);
+  }
+
+  @Test
+    void verifiesPageSizeLetter() {
+    PageSize pageSize = PageSize.LETTER;
+    assertThat(pageSize.getHeight()).isEqualTo(HEIGHT);
+    assertThat(pageSize.getWidth()).isEqualTo(WIDTH);
+  }
+
+    @Test
+    void verifiesPageSizeTabloid() {
+    PageSize pageSize = PageSize.TABLOID;
+    assertThat(pageSize.getHeight()).isEqualTo(HEIGHT);
+    assertThat(pageSize.getWidth()).isEqualTo(WIDTH);
+  }
+
+}