diff --git a/src/components/common/Select/select.test.tsx b/src/components/common/Select/select.test.tsx
new file mode 100644
index 0000000..c2c1ed7
--- /dev/null
+++ b/src/components/common/Select/select.test.tsx
@@ -0,0 +1,111 @@
+import '@testing-library/jest-dom';
+import React from 'react';
+import { describe, expect, it } from 'vitest';
+
+import { Select, SelectContent, SelectDivider, SelectItem, SelectLabel, SelectToggle } from '../';
+import { fireEvent, render, screen } from '../../../libs/test';
+
+const items = [
+  {
+    label: 'Cat',
+    value: 'cat',
+  },
+  {
+    label: 'Dog',
+    value: 'dog',
+  },
+  {
+    label: 'Fox',
+    value: 'fox',
+  },
+  {
+    label: 'Nilgai',
+    value: 'nilgai',
+  },
+  {
+    label: 'Numbird',
+    value: 'nunbird',
+    disabled: true,
+  },
+];
+
+describe('UI test', () => {
+  it('Should appear SelectContent when click SelectToggle', () => {
+    render(
+      <Select align="start">
+        <SelectToggle>SelectToggle</SelectToggle>
+        <SelectContent width={'15rem'}>
+          <SelectLabel>Animals</SelectLabel>
+          <SelectDivider />
+          {items.map(item => (
+            <SelectItem key={item.value} value={item.value} disabled={item.disabled}>
+              {item.label}
+            </SelectItem>
+          ))}
+        </SelectContent>
+      </Select>,
+    );
+
+    const toggleBtn = screen.getByText('SelectToggle');
+    expect(toggleBtn).toBeInTheDocument();
+
+    // open Select content
+    fireEvent.click(toggleBtn);
+
+    const selectLabel = screen.getByText('Animals');
+    expect(selectLabel).toBeInTheDocument();
+
+    // test whole items.
+    items.forEach(item => {
+      const itemLI = screen.getByText(item.label);
+      expect(itemLI).toBeInTheDocument();
+
+      if (item.disabled == true) {
+        expect(itemLI).toHaveAttribute('disabled');
+      } else expect(itemLI).not.toBeDisabled();
+    });
+
+    // when click item, select content should be closed.
+    fireEvent.click(screen.getByText(items[0].label));
+    expect(selectLabel).not.toBeInTheDocument();
+  });
+
+  it('Multiple Select', () => {
+    render(
+      <Select multi align="center">
+        <SelectToggle>SelectToggle</SelectToggle>
+        <SelectContent width={'15rem'}>
+          <SelectLabel>Animals</SelectLabel>
+          <SelectDivider />
+          {items.map(item => (
+            <SelectItem key={item.value} value={item.value} disabled={item.disabled}>
+              {item.label}
+            </SelectItem>
+          ))}
+        </SelectContent>
+      </Select>,
+    );
+
+    const toggleBtn = screen.getByText('SelectToggle');
+    expect(toggleBtn).toBeInTheDocument();
+
+    items.forEach(item => {
+      if (item.disabled) return;
+
+      // open Select content
+      fireEvent.click(toggleBtn);
+
+      const itemLI = screen.getByRole('option', { name: item.label });
+      expect(itemLI).toBeInTheDocument();
+
+      // select item (and close Select content)
+      fireEvent.click(itemLI);
+      // reopen Select content
+      fireEvent.click(toggleBtn);
+
+      // Is Selected?
+      const itemLI2 = screen.getByRole('option', { name: item.label });
+      expect(itemLI2).toHaveAttribute('aria-selected', 'true');
+    });
+  });
+});
diff --git a/src/components/common/Toast/toast.test.tsx b/src/components/common/Toast/toast.test.tsx
index 6d29e42..e048413 100644
--- a/src/components/common/Toast/toast.test.tsx
+++ b/src/components/common/Toast/toast.test.tsx
@@ -66,7 +66,7 @@ describe('Toast', () => {
 
     fireEvent.click(description);
 
-    waitFor(() => {
+    await waitFor(() => {
       // when click toast, it should be removed.
       expect(title).not.toBeInTheDocument();