[new feature] Step: add inactive-icon slot

packages/steps/test/index.spec.js

@@ -0,0 +1,29 @@
+import { mount } from '../../../test/utils';
+import Steps from '..';
+import Step from '../../step';
+
+test('icon slot', () => {
+  const wrapper = mount({
+    template: `
+    <steps :active="1">
+      <step>
+        <template v-slot:inactive-icon>Custim Inactive Icon</template>
+        A
+      </step>
+      <step>
+        <template v-slot:active-icon>Custim Active Icon</template>
+        B
+      </step>
+      <step>
+        <template v-slot:inactive-icon>Custim Inactive Icon</template>
+        C
+      </step>
+    </steps>
+    `,
+    components: {
+      Steps,
+      Step
+    }
+  });
+  expect(wrapper).toMatchSnapshot();
+});