test: add coverage for all handles disabled scenario

Author: 刘欢

src/hooks/useDrag.ts

@@ -78,6 +78,7 @@ function useDrag(
     }
     triggerChange(changeValues);
 
+    // Optional callback for drag change (not used in current implementation)
     if (onDragChange) {
       onDragChange({
         rawValues: nextValues,
@@ -92,6 +93,7 @@ function useDrag(
     (valueIndex: number, offsetPercent: number, deleteMark: boolean) => {
       if (valueIndex === -1) {
         // >>>> Dragging on the track
+        // Defensive: should not happen as Tracks/index.tsx blocks this when any handle is disabled
         if (isHandleDisabled && originValues.some((_, index) => isHandleDisabled(index))) {
           return;
         }
@@ -129,8 +131,8 @@ function useDrag(
   const onStartMove: OnStartMove = (e, valueIndex, startValues?: number[]) => {
     e.stopPropagation();
 
-    // 如果是点击 track 触发的，需要传入变化后的初始值，而不能直接用 rawValues
     const initialValues = startValues || rawValues;
+    // Defensive: should not happen as Handle.tsx blocks this when handle is disabled
     if (isHandleDisabled && isHandleDisabled(valueIndex)) {
       return;
     }
@@ -148,7 +150,7 @@ function useDrag(
     // We declare it here since closure can't get outer latest value
     let deleteMark = false;
 
-    // Internal trigger event
+    // Optional callback for drag start (not used in current implementation)
     if (onDragStart) {
       onDragStart({
         rawValues: initialValues,

tests/Range.test.tsx

@@ -981,5 +981,27 @@ describe('Range', () => {
 
       expect(onChange).not.toHaveBeenCalled();
     });
+
+    it('all handles disabled: find nearest enabled returns -1', () => {
+      // This test specifically covers line 426 in Slider.tsx
+      // When all handles are disabled and clicking near one,
+      // the nearestIndex search returns -1 and returns early
+      const onChange = jest.fn();
+      const { container } = render(
+        <Slider range defaultValue={[0, 50, 100]} disabled={[true, true, true]} onChange={onChange} />,
+      );
+
+      // Click at position 10 (near first disabled handle)
+      const rail = container.querySelector('.rc-slider-rail');
+      const mouseDown = createEvent.mouseDown(rail);
+      Object.defineProperties(mouseDown, {
+        clientX: { get: () => 10 },
+        clientY: { get: () => 10 },
+      });
+      fireEvent(rail, mouseDown);
+
+      // Should not trigger onChange because all handles are disabled
+      expect(onChange).not.toHaveBeenCalled();
+    });
   });
 });