feat: full page screenshots (microsoft#148)

pytest_playwright/pytest_playwright.py

@@ -267,7 +267,11 @@ def context(
                 pytestconfig, request, f"test-{human_readable_status}-{index+1}.png"
             )
             try:
-                page.screenshot(timeout=5000, path=screenshot_path)
+                page.screenshot(
+                    timeout=5000,
+                    path=screenshot_path,
+                    full_page=pytestconfig.getoption("--full-page-screenshot"),
+                )
             except Error:
                 pass
 
@@ -392,3 +396,9 @@ def pytest_addoption(parser: Any) -> None:
         choices=["on", "off", "only-on-failure"],
         help="Whether to automatically capture a screenshot after each test.",
     )
+    group.addoption(
+        "--full-page-screenshot",
+        action="store_true",
+        default=False,
+        help="Whether to take a full page screenshot",
+    )