diff --git a/server/src/classes/jumpDrive.js b/server/src/classes/jumpDrive.js
index b66f0b802..2127d0cd8 100644
--- a/server/src/classes/jumpDrive.js
+++ b/server/src/classes/jumpDrive.js
@@ -1,7 +1,7 @@
 import { System } from "./generic";
 
 class Sector {
-  constructor(params, powerLevel = 0) {
+  constructor(params = {}, powerLevel = 0) {
     this.level = params.level || Math.floor(powerLevel / 4);
     this.offset = params.offset || 0;
   }
@@ -17,7 +17,7 @@ class Sector {
 If a sector has more power than it needs
 */
 export default class JumpDrive extends System {
-  constructor(params) {
+  constructor(params = {}) {
     super(params);
     this.class = "JumpDrive";
     this.type = "JumpDrive";
diff --git a/server/tests/classes/jumpDrive.test.js b/server/tests/classes/jumpDrive.test.js
new file mode 100644
index 000000000..bff1a6363
--- /dev/null
+++ b/server/tests/classes/jumpDrive.test.js
@@ -0,0 +1,105 @@
+// TODO: Figure out why we need import { Engine } what to do about it
+import { Engine } from '../../src/classes/engine';
+import { System } from "../../src/classes/generic";
+import JumpDrive from '../../src/classes/jumpDrive';
+
+describe('JumpDrive', () => {
+
+  test('should throw if called without the \'new\' operator', () => {
+    expect(() => { const j = JumpDrive(); }).toThrow(/Cannot call a class as a function/);
+  });
+
+  test('should extend System', () => {
+    expect(new JumpDrive()).toBeInstanceOf(System);
+  })
+
+  describe('constructor', () => {   
+    test('should set default parameters', () => {
+      const j = new JumpDrive();
+      expect(j.name).toBe('Jump Drive');
+      expect(j.class).toBe('JumpDrive');
+      expect(j.type).toBe('JumpDrive');
+      expect(j.displayName).toBe('Jump Drive');
+      expect(j.simulatorId).toBeNull();
+      expect(j.power).toEqual({
+        power: 5,
+        powerLevels: [10, 16, 22, 28, 34, 40],
+        defaultLevel: 0
+      });
+      expect(j.env).toBe(0);
+      expect(j.activated).toBe(false);
+    });
+  });
+
+  describe('stealth factor', () => {
+    test.skip('should calculate the stealth factor', () => {
+      const j = new JumpDrive();
+      expect(j.stress).toBe(0);
+      j.setSectorOffset('fore', 0.3);
+      j.setSectorOffset('aft', 0.4);
+      j.setSectorOffset('starboard', 0.5);
+      j.setSectorOffset('port', 0.6);
+      expect(j.stealthFactor).toBe(0);
+      j.setActivated(true);
+      expect(j.stealthFactor).toBe(0.45);
+    });
+  });
+
+  describe('stress', () => {
+    test('should calculate the stress', () => {
+      const j = new JumpDrive();
+      expect(j.stress).toBe(0);
+      j.addSectorOffset('fore', 0.3);
+      j.addSectorOffset('aft', 0.4);
+      j.addSectorOffset('starboard', 0.5);
+      j.addSectorOffset('port', 0.6);
+      expect(j.stress).toBeCloseTo(0.45, 6);
+    });
+  });
+
+  describe('break', () => {
+    test('should deactivate jump drive', () => {
+      const j = new JumpDrive({ activated: true });
+      expect(j.activated).toBe(true);
+      j.break();
+      expect(j.activated).toBe(false);
+    });
+
+    test('should call super', () => {
+      const j = new JumpDrive();
+      expect(j.damage.damaged).toBe(false);
+      j.break();
+      expect(j.damage.damaged).toBe(true);
+    });
+  });
+
+  describe('setPower', () => {
+    test('should decrease env to the level indicated by the power', () => {
+      const j = new JumpDrive();
+
+      j.setEnv(5);
+      j.setPower(30);
+      expect(j.env).toBe(4);
+
+      j.setEnv(5);
+      j.setPower(20);
+      expect(j.env).toBe(2);
+
+      j.setPower(30);
+      expect(j.env).toBe(2);
+
+      j.setEnv(10);
+      j.setPower(60);
+      expect(j.env).toBe(6);
+
+      j.setPower(0);
+      expect(j.env).toBe(1);      
+    });
+
+    test('should call super', () => {
+      const j = new JumpDrive();
+      j.setPower(30);
+      expect(j.power.power).toBe(30);
+    });
+  });
+});