diff --git a/test/unit/historian_test.ts b/tests/historian.test.js
similarity index 59%
rename from test/unit/historian_test.ts
rename to tests/historian.test.js
index f25c396cc..8ca53f410 100644
--- a/test/unit/historian_test.ts
+++ b/tests/historian.test.js
@@ -1,17 +1,13 @@
-import * as sinon from 'sinon';
-import Client from '../../src/client';
-import { expect } from './sinon_chai';
+import Client from '../src/client';
 
 class Location {
-  private s: string;
+    constructor(s) {
+        this.s = s;
+    }
 
-  constructor(s: string) {
-    this.s = s;
-  }
-
-  public toString(): string {
-    return this.s;
-  }
+    toString() {
+        return this.s;
+    }
 }
 
 describe('instrumentation', () => {
@@ -20,10 +16,10 @@ describe('instrumentation', () => {
   let client;
 
   beforeEach(() => {
-    processor = sinon.spy((data) => {
+    processor = jest.fn((data) => {
       return data;
     });
-    reporter = sinon.spy(() => {
+    reporter = jest.fn(() => {
       return Promise.resolve({ id: 1 });
     });
     client = new Client({
@@ -39,7 +35,7 @@ describe('instrumentation', () => {
       let locations = ['', 'http://hello/world', 'foo', new Location('/')];
       for (let loc of locations) {
         try {
-          window.history.pushState(null, '', loc as string);
+          window.history.pushState(null, '', loc);
         } catch (_) {
           // ignore
         }
@@ -48,21 +44,21 @@ describe('instrumentation', () => {
     });
 
     it('records browser history', () => {
-      expect(reporter).to.have.been.called;
-      let notice = reporter.lastCall.args[0];
+      expect(reporter.mock.calls.length).toBe(1);
+      let notice = reporter.mock.calls[0][0];
       let history = notice.context.history;
 
       let state = history[history.length - 3];
       delete state.date;
-      expect(state).to.deep.equal({
+      expect(state).toStrictEqual({
         type: 'location',
-        from: '/context.html',
+        from: '/',
         to: '/world',
       });
 
       state = history[history.length - 2];
       delete state.date;
-      expect(state).to.deep.equal({
+      expect(state).toStrictEqual({
         type: 'location',
         from: '/world',
         to: '/foo',
@@ -70,7 +66,7 @@ describe('instrumentation', () => {
 
       state = history[history.length - 1];
       delete state.date;
-      expect(state).to.deep.equal({
+      expect(state).toStrictEqual({
         type: 'location',
         from: '/foo',
         to: '/',
@@ -87,16 +83,16 @@ describe('instrumentation', () => {
     });
 
     it('records request', () => {
-      expect(reporter).to.have.been.called;
-      let notice = reporter.lastCall.args[0];
+      expect(reporter.mock.calls.length).toBe(1);
+      let notice = reporter.mock.calls[0][0];
       let history = notice.context.history;
 
       let state = history[history.length - 1];
-      expect(state.type).to.equal('xhr');
-      expect(state.method).to.equal('GET');
-      expect(state.url).to.equal('http://ip2c.org/self');
-      expect(state.statusCode).to.equal(200);
-      expect(state.duration).to.be.a('number');
+      expect(state.type).toBe('xhr');
+      expect(state.method).toBe('GET');
+      expect(state.url).toBe('http://ip2c.org/self');
+      expect(state.statusCode).toBe(200);
+      expect(state.duration).toEqual(expect.any(Number));
     });
   });
 
@@ -111,16 +107,16 @@ describe('instrumentation', () => {
       });
 
       it('records request', () => {
-        expect(reporter).to.have.been.called;
-        let notice = reporter.lastCall.args[0];
+        expect(reporter.mock.calls.length).toBe(1);
+        let notice = reporter.mock.calls[0][0];
         let history = notice.context.history;
 
         let state = history[history.length - 1];
-        expect(state.type).to.equal('xhr');
-        expect(state.method).to.equal('GET');
-        expect(state.url).to.equal('http://ip2c.org/4.4.4.4');
-        expect(state.statusCode).to.equal(200);
-        expect(state.duration).to.be.a('number');
+        expect(state.type).toBe('xhr');
+        expect(state.method).toBe('GET');
+        expect(state.url).toBe('http://ip2c.org/4.4.4.4');
+        expect(state.statusCode).toBe(200);
+        expect(state.duration).toEqual(expect.any(Number));
       });
     });
 
@@ -134,16 +130,16 @@ describe('instrumentation', () => {
       });
 
       it('records request', () => {
-        expect(reporter).to.have.been.called;
-        let notice = reporter.lastCall.args[0];
+        expect(reporter.mock.calls.length).toBe(1);
+        let notice = reporter.mock.calls[0][0];
         let history = notice.context.history;
 
         let state = history[history.length - 1];
-        expect(state.type).to.equal('xhr');
-        expect(state.method).to.equal('POST');
-        expect(state.url).to.equal('http://ip2c.org/4.4.4.4');
-        expect(state.statusCode).to.equal(200);
-        expect(state.duration).to.be.a('number');
+        expect(state.type).toBe('xhr');
+        expect(state.method).toBe('POST');
+        expect(state.url).toBe('http://ip2c.org/4.4.4.4');
+        expect(state.statusCode).toBe(200);
+        expect(state.duration).toEqual(expect.any(Number));
       });
     });
 
@@ -161,16 +157,16 @@ describe('instrumentation', () => {
       });
 
       it('records request', () => {
-        expect(reporter).to.have.been.called;
-        let notice = reporter.lastCall.args[0];
+        expect(reporter.mock.calls.length).toBe(1);
+        let notice = reporter.mock.calls[0][0];
         let history = notice.context.history;
 
         let state = history[history.length - 1];
-        expect(state.type).to.equal('xhr');
-        expect(state.method).to.equal('POST');
-        expect(state.url).to.equal('http://ip2c.org/4.4.4.4');
-        expect(state.statusCode).to.equal(200);
-        expect(state.duration).to.be.a('number');
+        expect(state.type).toBe('xhr');
+        expect(state.method).toBe('POST');
+        expect(state.url).toBe('http://ip2c.org/4.4.4.4');
+        expect(state.statusCode).toBe(200);
+        expect(state.duration).toEqual(expect.any(Number));
       });
     });
   });
@@ -185,20 +181,20 @@ describe('instrumentation', () => {
     });
 
     it('records log message', () => {
-      expect(reporter).to.have.been.called;
-      let notice = reporter.lastCall.args[0];
+      expect(reporter.mock.calls.length).toBe(1);
+      let notice = reporter.mock.calls[0][0];
       let history = notice.context.history;
-      expect(history).to.have.length(20);
+      expect(history).toHaveLength(20);
 
       for (let i in history) {
         if (!history.hasOwnProperty(i)) {
           continue;
         }
         let state = history[i];
-        expect(state.type).to.equal('log');
-        expect(state.severity).to.equal('log');
-        expect(state.arguments).to.deep.equal([+i + 5]);
-        expect(state.date).to.exist;
+        expect(state.type).toBe('log');
+        expect(state.severity).toBe('log');
+        expect(state.arguments).toStrictEqual([+i + 5]);
+        expect(state.date).not.toBeNull();
       }
     });
   });