fix(keep-alive): bug prune oldest entry

src/core/components/keep-alive.js

@@ -113,7 +113,7 @@ export default {
         keys.push(key)
         // prune oldest entry
         if (this.max && keys.length > parseInt(this.max)) {
-          pruneCacheEntry(cache, keys[0], keys, this._vnode)
+          pruneCacheEntry(cache, keys[0], keys, vnode)
         }
       }
 

test/unit/features/component/component-keep-alive.spec.js

@@ -572,6 +572,56 @@ describe('Component keep-alive', () => {
     }).then(done)
   })
 
+  // #10015
+  it('prune cache on max set 1', done => {
+    const spyA = jasmine.createSpy()
+    const spyB = jasmine.createSpy()
+    const spyAD = jasmine.createSpy()
+    const spyBD = jasmine.createSpy()
+
+    function assertCount (calls) {
+      expect([
+        spyA.calls.count(),
+        spyAD.calls.count(),
+        spyB.calls.count(),
+        spyBD.calls.count(),
+      ]).toEqual(calls)
+    }
+
+    const vm = new Vue({
+      template: `
+        <keep-alive max="1">
+          <component :is="n"></component>
+        </keep-alive>
+      `,
+      data: {
+        n: 'aa'
+      },
+      components: {
+        aa: {
+          template: '<div>a</div>',
+          created: spyA,
+          destroyed: spyAD
+        },
+        bb: {
+          template: '<div>bbb</div>',
+          created: spyB,
+          destroyed: spyBD
+        }
+      }
+    }).$mount()
+
+    assertCount([1, 0, 0, 0])
+    vm.n = 'bb'
+    waitForUpdate(() => {
+      // should prune A because max cache reached
+      assertCount([1, 1, 1, 0])
+      vm.n = 'aa'
+    }).then(() => {
+      assertCount([2, 1, 1, 1])
+    }).then(done)
+  })
+
   it('should warn unknown component inside', () => {
     new Vue({
       template: `<keep-alive><foo/></keep-alive>`