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diff --git a/test/console/components/console/completion.test.jsx b/test/console/components/console/completion.test.jsx
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+++ b/test/console/components/console/completion.test.jsx
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+import { h, render } from 'preact';
+import Completion from 'console/components/console/completion'
+
+describe("console/components/console/completion", () => {
+  let completions = [{
+    name: "Fruit",
+    items: [{ caption: "apple" }, { caption: "banana" }, { caption: "cherry" }],
+  }, {
+    name: "Element",
+    items: [{ caption: "argon" }, { caption: "boron" }, { caption: "carbon" }],
+  }];
+
+  beforeEach(() => {
+    document.body.innerHTML = '';
+  });
+
+  it('renders Completion component', () => {
+    let ul = render(<Completion
+      completions={completions}
+      size={30}
+      />, document.body);
+
+    expect(ul.children).to.have.lengthOf(8);
+    expect(ul.children[0].textContent).to.equal('Fruit');
+    expect(ul.children[1].textContent).to.equal('apple');
+    expect(ul.children[2].textContent).to.equal('banana');
+    expect(ul.children[3].textContent).to.equal('cherry');
+    expect(ul.children[4].textContent).to.equal('Element');
+    expect(ul.children[5].textContent).to.equal('argon');
+    expect(ul.children[6].textContent).to.equal('boron');
+    expect(ul.children[7].textContent).to.equal('carbon');
+  });
+
+  it('highlight current item', () => {
+    let ul = render(<Completion
+      completions={completions}
+      size={30}
+      select={3}
+      />, document.body);
+    expect(ul.children[5].className.split(' ')).to.include('vimvixen-completion-selected');
+  });
+
+  it('does not highlight any items', () => {
+    let ul = render(<Completion
+      completions={completions}
+      size={30}
+      select={-1}
+      />, document.body);
+    for (let li of ul.children) {
+      expect(li.className.split(' ')).not.to.include('vimvixen-completion-selected');
+    }
+  });
+
+
+  it('limits completion items', () => {
+    let ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={-1}
+      />, document.body);
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['Fruit', 'apple', 'banana']);
+
+    ul = render(<Completion
+      completions={completions}
+      size={3} select={0}
+      />, document.body, ul);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['Fruit', 'apple', 'banana']);
+    expect(ul.children[1].className.split(' ')).to.include('vimvixen-completion-selected');
+  })
+
+  it('scrolls up to down with select', () => {
+    let ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={1}
+      />, document.body);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['Fruit', 'apple', 'banana']);
+    expect(ul.children[2].className.split(' ')).to.include('vimvixen-completion-selected');
+
+    ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={2}
+      />, document.body, ul);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['apple', 'banana', 'cherry']);
+    expect(ul.children[2].className.split(' ')).to.include('vimvixen-completion-selected');
+
+    ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={3}
+      />, document.body, ul);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['cherry', 'Element', 'argon']);
+    expect(ul.children[2].className.split(' ')).to.include('vimvixen-completion-selected');
+  });
+
+  it('scrolls up to down with select', () => {
+    let ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={5}
+      />, document.body);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['argon', 'boron', 'carbon']);
+    expect(ul.children[2].className.split(' ')).to.include('vimvixen-completion-selected');
+
+    ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={4}
+      />, document.body, ul);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['argon', 'boron', 'carbon']);
+    expect(ul.children[1].className.split(' ')).to.include('vimvixen-completion-selected');
+
+    ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={3}
+      />, document.body, ul);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['argon', 'boron', 'carbon']);
+    expect(ul.children[0].className.split(' ')).to.include('vimvixen-completion-selected');
+
+    ul = render(<Completion
+      completions={completions}
+      size={3}
+      select={2}
+      />, document.body, ul);
+
+    expect(Array.from(ul.children).map(e => e.textContent)).to.deep.equal(['cherry', 'Element', 'argon']);
+    expect(ul.children[0].className.split(' ')).to.include('vimvixen-completion-selected');
+  });
+});