Use JavaScript to detect if Selection.modify is available.

dart/tests/try/firefox.applescript

Index: dart/tests/try/firefox.applescript
diff --git a/dart/tests/try/firefox.applescript b/dart/tests/try/firefox.applescript
index a7f674c4197b967c9d6e1d9c601ded98a2a3865f..d5a4c51018f6e98e32da8c3229946237b0726a5d 100644
--- a/dart/tests/try/firefox.applescript
+++ b/dart/tests/try/firefox.applescript
@@ -51,7 +51,76 @@ tell application "System Events"
         -- Simulate Delete
         key code 51
 
+        delay 0.1
+        keystroke "a" using command down
+        delay 0.2
+        keystroke "c" using command down
+
+        delay 0.2
+        set clipboardData to (the clipboard as text)
+
+        if ("main() {" is in (clipboardData as string)) then
+                error "main() { in clipboardData"
+        end if
+
+        if ("main() " is not in (clipboardData as string)) then
+                error "main() is not in clipboardData"
+        end if
+
+        keystroke "l" using command down
+        delay 0.2
+
+        keystroke "http://localhost:8080/"
+        -- Simulate Enter key.
+        key code 36
+
+        delay 5.0
+
+        keystroke "l" using command down
+        -- Simulate Tab key.
+        key code 48
+        key code 48
+        key code 48
+        key code 48
+
+        -- Simulate End key.
+        key code 119
+
+        -- Simulate Home key.
+        key code 115
+
+        -- Simulate Tab key.
+        key code 48
+
         -- Simulate Cmd-Down.
-        -- key code 125 using command down
+        key code 125 using command down
+
+        repeat 204 times
+                -- Simulate Delete
+               key code 51
+        end repeat
+
+        delay 5.0
+        repeat 64 times
+                -- Simulate Delete
+               key code 51
+        end repeat
+
+
+        delay 0.1
+        keystroke "a" using command down
+        delay 0.5
+        keystroke "c" using command down
+
+        delay 0.5
+        set clipboardData to (the clipboard as text)
+
+        if ("/" is not (clipboardData as string)) then
+                error "/ is not clipboardData"
+        end if
 
 end tell
+
+tell application "Firefox" to quit
+
+display notification "Test passed" with title "Firefox test" sound name "Glass"