diff --git a/test/unit/specs/date-picker.spec.js b/test/unit/specs/date-picker.spec.js
index 41b2371..3e066da 100644
--- a/test/unit/specs/date-picker.spec.js
+++ b/test/unit/specs/date-picker.spec.js
@@ -1,4 +1,4 @@
-import { createVue, destroyVM } from '../util';
+import { createVue, destroyVM, stringToDate } from '../util';
 
 describe('DatePicker.vue', () => {
   let vm;
@@ -25,4 +25,112 @@ describe('DatePicker.vue', () => {
       done();
     });
   });
+
+  it('should create a DatePicker component of type="datetimerange"', done => {
+    vm = createVue(`
+      <Date-Picker type="datetimerange"></Date-Picker>
+    `);
+    const picker = vm.$children[0];
+    expect(picker.$children.length).to.equal(2);
+    expect(Array.isArray(picker.currentValue)).to.equal(true);
+    done();
+  });
+
+  it('should create a datetimerange component and pick 2 dates in the current month', done => {
+    vm = createVue(`
+      <Date-picker type="datetimerange"></Date-picker>
+    `);
+
+    const picker = vm.$children[0];
+    picker.handleIconClick();
+    vm.$nextTick(() => {
+      const displayField = vm.$el.querySelector('.ivu-input');
+      const clickableCells = vm.$el.querySelectorAll('.ivu-date-picker-cells-cell');
+      const lastMonthClass = 'ivu-date-picker-cells-cell-prev-month';
+      const firstDayInMonthIndex = [...clickableCells].findIndex(cell => !cell.classList.contains(lastMonthClass));
+
+      clickableCells[firstDayInMonthIndex].firstElementChild.click();
+      vm.$nextTick(() => {
+        clickableCells[firstDayInMonthIndex + 4].firstElementChild.click();
+        vm.$nextTick(() => {
+          const dayOne = new Date();
+          dayOne.setDate(1);
+          dayOne.setHours(0, 0, 0, 0);
+          const dayFive = new Date(dayOne.getTime());
+          dayFive.setDate(5);
+          dayFive.setHours(0, 0, 0, 0);
+
+          // check pickers internal value
+          const [startInternalValue, endInternalValue] = picker.currentValue; // Date Objects
+          expect(Math.abs(dayOne - startInternalValue)).to.equal(0);
+          expect(Math.abs(dayFive - endInternalValue)).to.equal(0);
+
+          // check pickers display value
+          const [startDisplayValue, endDisplayValue] = displayField.value.split(' - ').map(stringToDate); // Date Objects
+          expect(Math.abs(dayOne - startDisplayValue)).to.equal(0);
+          expect(Math.abs(dayFive - endDisplayValue)).to.equal(0);
+
+          done();
+        });
+      });
+    });
+  });
+
+  it('should have same behavior after a reset as before the reset', done => {
+    vm = createVue(`
+      <Date-picker type="datetimerange"></Date-picker>
+    `);
+
+    const picker = vm.$children[0];
+    picker.handleIconClick();
+    vm.$nextTick(() => {
+      const displayField = vm.$el.querySelector('.ivu-input');
+      const clickableCells = vm.$el.querySelectorAll('.ivu-date-picker-cells-cell');
+      const lastMonthClass = 'ivu-date-picker-cells-cell-prev-month';
+      const firstDayInMonthIndex = [...clickableCells].findIndex(cell => !cell.classList.contains(lastMonthClass));
+
+      // choose first date
+      clickableCells[firstDayInMonthIndex].firstElementChild.click();
+      vm.$nextTick(() => {
+        // choose second date
+        clickableCells[firstDayInMonthIndex + 4].firstElementChild.click();
+        vm.$nextTick(() => {
+          // cache first values
+          const [startInternalValue, endInternalValue] = picker.currentValue; // Date Objects
+          const [startDisplayValue, endDisplayValue] = displayField.value.split(' - ').map(stringToDate); // Date Objects
+
+          // clear picker
+          picker.handleClear();
+          vm.$nextTick(() => {
+            // it should be closed by now
+            expect(picker.visible).to.equal(false);
+            // open picker again
+            picker.handleIconClick();
+
+            vm.$nextTick(() => {
+              expect(picker.visible).to.equal(true);
+              expect(JSON.stringify(picker.currentValue)).to.equal('[null,null]');
+              expect(displayField.value).to.equal('');
+
+              clickableCells[firstDayInMonthIndex].firstElementChild.click();
+              vm.$nextTick(() => {
+                clickableCells[firstDayInMonthIndex + 4].firstElementChild.click();
+                vm.$nextTick(() => {
+                  // recheck internal values
+                  expect(Math.abs(picker.currentValue[0] - startInternalValue)).to.equal(0);
+                  expect(Math.abs(picker.currentValue[1] - endInternalValue)).to.equal(0);
+                  // recheck display value
+                  const [_startDisplayValue, _endDisplayValue] = displayField.value.split(' - ').map(stringToDate); // Date Objects
+                  expect(Math.abs(_startDisplayValue - startDisplayValue)).to.equal(0);
+                  expect(Math.abs(_endDisplayValue - endDisplayValue)).to.equal(0);
+
+                  done();
+                });
+              });
+            });
+          });
+        });
+      });
+    });
+  });
 });
diff --git a/test/unit/util.js b/test/unit/util.js
index 47cd331..42f0a9a 100644
--- a/test/unit/util.js
+++ b/test/unit/util.js
@@ -58,6 +58,16 @@ exports.createTest = function(Compo, propsData = {}, mounted = false) {
 };
 
 /**
+ * Transform Date string (yyyy-mm-dd hh:mm:ss) to Date object
+ * @param {String}
+ */
+exports.stringToDate = function(str) {
+  const parts = str.split(/[^\d]/).filter(Boolean);
+  parts[1] = parts[1] - 1;
+  return new Date(...parts);
+};
+
+/**
  * 触发一个事件
  * mouseenter, mouseleave, mouseover, keyup, change, click 等
  * @param  {Element} elm
--
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