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diff --git a/test/content/domains/KeySequence.test.ts b/test/content/domains/KeySequence.test.ts
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+import KeySequence from '../../../src/content/domains/KeySequence';
+import { expect } from 'chai'
+import Key from "../../../src/shared/settings/Key";
+
+describe("KeySequence", () => {
+  describe('#push', () => {
+    it('append a key to the sequence', () => {
+      let seq = new KeySequence([]);
+      seq.push(Key.fromMapKey('g'));
+      seq.push(Key.fromMapKey('<S-U>'));
+
+      expect(seq.keys[0].key).to.equal('g');
+      expect(seq.keys[1].key).to.equal('U');
+      expect(seq.keys[1].shift).to.be.true;
+    })
+  });
+
+  describe('#startsWith', () => {
+    it('returns true if the key sequence starts with param', () => {
+      let seq = new KeySequence([
+        Key.fromMapKey('g'),
+        Key.fromMapKey('<S-U>'),
+      ]);
+
+      expect(seq.startsWith(new KeySequence([
+      ]))).to.be.true;
+      expect(seq.startsWith(new KeySequence([
+        Key.fromMapKey('g'),
+      ]))).to.be.true;
+      expect(seq.startsWith(new KeySequence([
+        Key.fromMapKey('g'), Key.fromMapKey('<S-U>'),
+      ]))).to.be.true;
+      expect(seq.startsWith(new KeySequence([
+        Key.fromMapKey('g'), Key.fromMapKey('<S-U>'), Key.fromMapKey('x'),
+      ]))).to.be.false;
+      expect(seq.startsWith(new KeySequence([
+        Key.fromMapKey('h'),
+      ]))).to.be.false;
+    });
+
+    it('returns true if the empty sequence starts with an empty sequence', () => {
+      let seq = new KeySequence([]);
+
+      expect(seq.startsWith(new KeySequence([]))).to.be.true;
+      expect(seq.startsWith(new KeySequence([
+        Key.fromMapKey('h'),
+      ]))).to.be.false;
+    })
+  });
+
+  describe('#isDigitOnly', () => {
+      it('returns true the keys are only digits', () => {
+        expect(new KeySequence([
+          new Key({ key: '4' }),
+          new Key({ key: '0' }),
+        ]).isDigitOnly()).to.be.true;
+        expect(new KeySequence([
+          new Key({ key: '4' }),
+          new Key({ key: '0' }),
+          new Key({ key: 'z' }),
+        ]).isDigitOnly()).to.be.false;
+      })
+  });
+
+  describe('#repeatCount', () => {
+    it('returns repeat count with a numeric prefix', () => {
+      let seq = new KeySequence([
+        new Key({ key: '1' }), new Key({ key: '0' })  ,
+        new Key({ key: 'g' }), new Key({ key: 'g' })  ,
+      ]);
+      expect(seq.repeatCount()).to.equal(10);
+
+      seq = new KeySequence([
+        new Key({ key: '0' }), new Key({ key: '5' })  ,
+        new Key({ key: 'g' }), new Key({ key: 'g' })  ,
+      ]);
+      expect(seq.repeatCount()).to.equal(5);
+    });
+
+    it('returns 1 if no numeric prefix', () => {
+      let seq = new KeySequence([
+        new Key({ key: 'g' }), new Key({ key: 'g' })  ,
+      ]);
+      expect(seq.repeatCount()).to.equal(1);
+
+      seq = new KeySequence([]);
+      expect(seq.repeatCount()).to.equal(1);
+    });
+
+    it('returns whole keys if digits only sequence', () => {
+      let seq = new KeySequence([
+        new Key({ key: '1' }), new Key({ key: '0' })  ,
+      ]);
+      expect(seq.repeatCount()).to.equal(10);
+
+      seq = new KeySequence([
+        new Key({ key: '0' }), new Key({ key: '5' })  ,
+      ]);
+      expect(seq.repeatCount()).to.equal(5);
+    });
+  });
+
+  describe('#trimNumericPrefix', () => {
+    it('removes numeric prefix', () => {
+      let seq = new KeySequence([
+        new Key({ key: '1' }), new Key({ key: '0' }) ,
+        new Key({ key: 'g' }), new Key({ key: 'g' }) , new Key({ key: '3' })  ,
+      ]).trimNumericPrefix();
+      expect(seq.keys.map(key => key.key)).to.deep.equal(['g', 'g', '3']);
+    });
+
+    it('returns empty if keys contains only digis', () => {
+      let seq = new KeySequence([
+        new Key({ key: '1' }), new Key({ key: '0' })  ,
+      ]).trimNumericPrefix();
+      expect(seq.trimNumericPrefix().keys).to.be.empty;
+    });
+
+    it('returns itself if no numeric prefix', () => {
+      let seq = new KeySequence([
+        new Key({ key: 'g' }), new Key({ key: 'g' }) , new Key({ key: '3' })  ,
+      ]).trimNumericPrefix();
+
+      expect(seq.keys.map(key => key.key)).to.deep.equal(['g', 'g', '3']);
+    });
+  });
+
+  describe('#splitNumericPrefix', () => {
+      it('splits numeric prefix', () => {
+        expect(KeySequence.fromMapKeys('10gg').splitNumericPrefix()).to.deep.equal([
+          KeySequence.fromMapKeys('10'),
+          KeySequence.fromMapKeys('gg'),
+        ]);
+        expect(KeySequence.fromMapKeys('10').splitNumericPrefix()).to.deep.equal([
+          KeySequence.fromMapKeys('10'),
+          new KeySequence([]),
+        ]);
+        expect(KeySequence.fromMapKeys('gg').splitNumericPrefix()).to.deep.equal([
+          new KeySequence([]),
+          KeySequence.fromMapKeys('gg'),
+        ]);
+      });
+  });
+
+  describe('#fromMapKeys', () => {
+    it('returns mapped keys for Shift+Esc', () => {
+      let keys = KeySequence.fromMapKeys('<S-Esc>').keys;
+      expect(keys).to.have.lengthOf(1);
+      expect(keys[0].key).to.equal('Esc');
+      expect(keys[0].shift).to.be.true;
+    });
+
+    it('returns mapped keys for a<C-B><A-C>d<M-e>', () => {
+      let keys = KeySequence.fromMapKeys('a<C-B><A-C>d<M-e>').keys;
+      expect(keys).to.have.lengthOf(5);
+      expect(keys[0].key).to.equal('a');
+      expect(keys[1].ctrl).to.be.true;
+      expect(keys[1].key).to.equal('b');
+      expect(keys[2].alt).to.be.true;
+      expect(keys[2].key).to.equal('c');
+      expect(keys[3].key).to.equal('d');
+      expect(keys[4].meta).to.be.true;
+      expect(keys[4].key).to.equal('e');
+    });
+  })
+});