Add example tests for canvas actions

examples/test_canvas.py

@@ -0,0 +1,38 @@
+from seleniumbase import BaseCase
+
+
+class CanvasTests(BaseCase):
+    def get_pixel_colors(self):
+        # Return the RGB colors of the canvas element's top left pixel
+        x = 0
+        y = 0
+        if self.browser == "safari":
+            x = 1
+            y = 1
+        color = self.execute_script(
+            "return document.querySelector('canvas').getContext('2d')"
+            ".getImageData(%s,%s,1,1).data;" % (x, y)
+        )
+        if self.is_chromium():
+            return [color[0], color[1], color[2]]
+        else:
+            return [color['0'], color['1'], color['2']]
+
+    def test_canvas_actions(self):
+        self.open("https://seleniumbase.io/canvas/")
+        self.highlight("canvas")
+        rgb = self.get_pixel_colors()
+        self.assert_equal(rgb, [221, 242, 231])  # Looks greenish
+        self.click_with_offset("canvas", 500, 350)
+        self.highlight("canvas")
+        rgb = self.get_pixel_colors()
+        self.assert_equal(rgb, [39, 42, 56])  # Blue by hamburger
+
+    def test_canvas_click(self):
+        self.open("https://seleniumbase.io/other/canvas")
+        self.click_with_offset("canvas", 300, 200)
+        self.sleep(1)  # Not needed (Lets you see the alert pop up)
+        alert = self.switch_to_alert()
+        self.assert_equal(alert.text, "You clicked on the square!")
+        self.accept_alert()
+        self.sleep(1)  # Not needed (Lets you see the alert go away)