Add a calculator example test

Author: mdmintz

examples/test_calculator.py

@@ -0,0 +1,14 @@
+from seleniumbase import BaseCase
+
+
+class CalculatorTests(BaseCase):
+    def test_6_times_7_plus_12_equals_54(self):
+        self.open("seleniumbase.io/apps/calculator")
+        self.click('button[id="6"]')
+        self.click("button#multiply")
+        self.click('button[id="7"]')
+        self.click("button#add")
+        self.click('button[id="1"]')
+        self.click('button[id="2"]')
+        self.click("button#equal")
+        self.assert_exact_text("54", "input#output")