Fix set immediate value (#432)

* fix set immediate value

android_tests/lib/android/specs/android/element/textfield.rb

@@ -58,5 +58,15 @@ def after_last
     hide_keyboard
   end
 
+  t 'set_immediate_value' do
+    message = 'hello'
+
+    wait do
+      elem = textfield(1)
+      set_immediate_value(elem, message)
+      elem.text.must_equal message
+    end
+  end
+
   t { after_last }
 end

ios_tests/lib/ios/specs/ios/element/textfield.rb

@@ -124,6 +124,22 @@ def must_raise_no_element
     textfields_exact('does not exist').length.must_equal 0
   end
 
+  t 'set_immediate_value' do
+    go_to_textfields
+
+    message = 'hello'
+
+    element = textfield(1)
+    element.click
+    element.clear
+
+    set_immediate_value(element, message)
+    element.text.must_equal message
+
+    set_wait 10
+    leave_textfields
+  end
+
   t 'after_last' do
     after_last
   end

lib/appium_lib/device/device.rb

@@ -220,10 +220,18 @@ def long_press_keycode(key, metastate = nil)
           end
         end
 
-        # TODO: TEST ME
+        # @!method set_immediate_value
+        #   Set the value to element directly
+        #   for iOS; setValue is called in XCUITest instead because XCUITest doesn't provide set value directly.
+        #   https://github.com/appium/appium-xcuitest-driver/blob/793cdc7d5e84bd553e375076e1c6dc7e242c9cde/lib/commands/element.js#L123
+        #
+        #   ```ruby
+        #   set_immediate_value element, 'hello'
+        #   ```
         add_endpoint_method(:set_immediate_value) do
-          def set_immediate_value(element, value)
-            execute :set_immediate_value, { id: element.ref }, value: value
+          def set_immediate_value(element, *value)
+            keys = ::Selenium::WebDriver::Keys.encode(value)
+            execute :set_immediate_value, { id: element.ref }, value: Array(keys)
           end
         end