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diff --git a/test/background/completion/impl/filters.test.ts b/test/background/completion/impl/filters.test.ts
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+++ b/test/background/completion/impl/filters.test.ts
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+import * as filters from '../../../../src/background/completion/impl/filters'
+import { expect } from 'chai';
+
+describe('background/usecases/filters', () => {
+  describe('filterHttp', () => {
+    it('filters http URLs duplicates to https hosts', () => {
+      const pages = [
+        { id: '0', url: 'http://i-beam.org/foo' },
+        { id: '1', url: 'https://i-beam.org/bar' },
+        { id: '2', url: 'http://i-beam.net/hoge' },
+        { id: '3', url: 'http://i-beam.net/fuga' },
+      ];
+      const filtered = filters.filterHttp(pages);
+
+      const urls = filtered.map(x => x.url);
+      expect(urls).to.deep.equal([
+        'https://i-beam.org/bar', 'http://i-beam.net/hoge', 'http://i-beam.net/fuga'
+      ]);
+    })
+  });
+
+  describe('filterBlankTitle', () => {
+    it('filters blank titles', () => {
+      const pages = [
+        { id: '0', title: 'hello' },
+        { id: '1', title: '' },
+        { id: '2' },
+      ];
+      const filtered = filters.filterBlankTitle(pages);
+
+      expect(filtered).to.deep.equal([{ id: '0', title: 'hello' }]);
+    });
+  });
+
+  describe('filterByTailingSlash', () => {
+    it('filters duplicated pathname on tailing slash', () => {
+      const pages = [
+        { id: '0', url: 'http://i-beam.org/content' },
+        { id: '1', url: 'http://i-beam.org/content/' },
+        { id: '2', url: 'http://i-beam.org/search' },
+        { id: '3', url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+      ];
+      const filtered = filters.filterByTailingSlash(pages);
+
+      const urls = filtered.map(x => x.url);
+      expect(urls).to.deep.equal([
+        'http://i-beam.org/content',
+        'http://i-beam.org/search',
+        'http://i-beam.org/search?q=apple_banana_cherry',
+      ]);
+    });
+  })
+
+  describe('filterByPathname', () => {
+    it('remains items less than minimam length', () => {
+      const pages = [
+        { id: '0', url: 'http://i-beam.org/search?q=apple' },
+        { id: '1', url: 'http://i-beam.org/search?q=apple_banana' },
+        { id: '2', url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { id: '3', url: 'http://i-beam.org/request?q=apple' },
+        { id: '4', url: 'http://i-beam.org/request?q=apple_banana' },
+        { id: '5', url: 'http://i-beam.org/request?q=apple_banana_cherry' },
+      ];
+      const filtered = filters.filterByPathname(pages, 10);
+      expect(filtered).to.have.lengthOf(6);
+    });
+
+    it('filters by length of pathname', () => {
+      const pages = [
+        { id: '0', url: 'http://i-beam.org/search?q=apple' },
+        { id: '1', url: 'http://i-beam.org/search?q=apple_banana' },
+        { id: '2', url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { id: '3', url: 'http://i-beam.net/search?q=apple' },
+        { id: '4', url: 'http://i-beam.net/search?q=apple_banana' },
+        { id: '5', url: 'http://i-beam.net/search?q=apple_banana_cherry' },
+      ];
+      const filtered = filters.filterByPathname(pages, 0);
+      expect(filtered).to.deep.equal([
+        { id: '0', url: 'http://i-beam.org/search?q=apple' },
+        { id: '3', url: 'http://i-beam.net/search?q=apple' },
+      ]);
+    });
+  });
+
+  describe('filterByOrigin', () => {
+    it('remains items less than minimam length', () => {
+      const pages = [
+        { id: '0', url: 'http://i-beam.org/search?q=apple' },
+        { id: '1', url: 'http://i-beam.org/search?q=apple_banana' },
+        { id: '2', url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { id: '3', url: 'http://i-beam.org/request?q=apple' },
+        { id: '4', url: 'http://i-beam.org/request?q=apple_banana' },
+        { id: '5', url: 'http://i-beam.org/request?q=apple_banana_cherry' },
+      ];
+      const filtered = filters.filterByOrigin(pages, 10);
+      expect(filtered).to.have.lengthOf(6);
+    });
+
+    it('filters by length of pathname', () => {
+      const pages = [
+        { id: '0', url: 'http://i-beam.org/search?q=apple' },
+        { id: '1', url: 'http://i-beam.org/search?q=apple_banana' },
+        { id: '2', url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { id: '3', url: 'http://i-beam.org/request?q=apple' },
+        { id: '4', url: 'http://i-beam.org/request?q=apple_banana' },
+        { id: '5', url: 'http://i-beam.org/request?q=apple_banana_cherry' },
+      ];
+      const filtered = filters.filterByOrigin(pages, 0);
+      expect(filtered).to.deep.equal([
+        { id: '0', url: 'http://i-beam.org/search?q=apple' },
+      ]);
+    });
+  });
+});