fix(node): fire input event when clearing a text field

CHANGELOG.md

@@ -14,6 +14,7 @@
 - `Node#select_option` and `Node#unselect_option` didn't fire the `input` event on the select [#223]
 - `Node#trigger` silently dispatched nothing for events other than mouse, focus and `submit`, such as `input`,
   `change` or custom events [#197]
+- `Node#set` with an empty string cleared a text field without firing the `input` event [#164]
 
 ### Removed
 

lib/capybara/cuprite/javascripts/index.js

@@ -220,6 +220,10 @@ class Cuprite {
 
         this.keyupdowned(node, "keyup", char, keyCode);
       }
+
+      if (valueBefore !== "" && node.value === "") {
+        this.input(node, "deleteContentBackward");
+      }
     }
 
     if (valueBefore !== node.value) {
@@ -238,8 +242,8 @@ class Cuprite {
     return nativeTextareaValueSetter.call(node, value);
   }
 
-  input(node) {
-    let event = new InputEvent("input", { inputType: "insertText", bubbles: true, cancelable: false });
+  input(node, inputType = "insertText") {
+    let event = new InputEvent("input", { inputType: inputType, bubbles: true, cancelable: false });
     node.dispatchEvent(event);
   }
 

spec/features/driver_spec.rb

@@ -1575,6 +1575,19 @@ def create_screenshot(file, *args)
             input.set("a")
             expect(output.text).to eq("keydown keypress input keyup change keydown keypress input keyup")
           end
+
+          it "calls the input event when clearing the value" do
+            input.set("a")
+            input.set("")
+            expect(output.text).to eq("keydown keypress input keyup change input change")
+            expect(output["data-input-type"]).to eq("deleteContentBackward")
+            expect(input.value).to be_empty
+          end
+
+          it "doesn't call the input event when clearing an empty value" do
+            input.set("")
+            expect(output.text).to be_empty
+          end
         end
       end