[java][bidi] Add print command

Author: pujagani

java/src/org/openqa/selenium/bidi/browsingcontext/BrowsingContext.java

@@ -32,6 +32,9 @@
 import org.openqa.selenium.json.Json;
 import org.openqa.selenium.json.JsonInput;
 import org.openqa.selenium.json.TypeToken;
+import org.openqa.selenium.print.PageMargin;
+import org.openqa.selenium.print.PageSize;
+import org.openqa.selenium.print.PrintOptions;
 
 public class BrowsingContext {
 
@@ -310,6 +313,20 @@ public void activate() {
     this.bidi.send(new Command<>("browsingContext.activate", Map.of(CONTEXT, id)));
   }
 
+  public String print(PrintOptions printOptions) {
+    Map<String, Object> printOptionsParams = printOptions.toMap();
+    printOptionsParams.put(CONTEXT, id);
+
+    return this.bidi.send(
+        new Command<>(
+            "browsingContext.print",
+            printOptionsParams,
+            jsonInput -> {
+              Map<String, Object> result = jsonInput.read(Map.class);
+              return (String) result.get("data");
+            }));
+  }
+
   public void close() {
     // This might need more clean up actions once the behavior is defined.
     // Specially when last tab or window is closed.

java/test/org/openqa/selenium/bidi/browsingcontext/BrowsingContextTest.java

@@ -41,6 +41,7 @@
 import org.openqa.selenium.environment.webserver.AppServer;
 import org.openqa.selenium.environment.webserver.NettyAppServer;
 import org.openqa.selenium.environment.webserver.Page;
+import org.openqa.selenium.print.PrintOptions;
 import org.openqa.selenium.remote.RemoteWebElement;
 import org.openqa.selenium.testing.JupiterTestBase;
 import org.openqa.selenium.testing.NotYetImplemented;
@@ -478,6 +479,25 @@ void canSetViewportWithDevicePixelRatio() {
     assertThat(newDevicePixelRatio).isEqualTo(5);
   }
 
+  @Test
+  @NotYetImplemented(SAFARI)
+  @NotYetImplemented(IE)
+  void canPrintPage() {
+    BrowsingContext browsingContext = new BrowsingContext(driver, driver.getWindowHandle());
+
+    driver.get(appServer.whereIs("formPage.html"));
+    PrintOptions printOptions = new PrintOptions();
+
+    String printPage = browsingContext.print(printOptions);
+
+    assertThat(printPage.length()).isPositive();
+    // Comparing expected PDF is a hard problem.
+    // As long as we are sending the parameters correctly it should be fine.
+    // Trusting the browsers to do the right thing.
+    // Hence, just checking if the response is base64 encoded string.
+    assertThat(printPage).contains("JVBER");
+  }
+
   private String alertPage() {
     return appServer.create(
         new Page()