diff --git a/test/clear-auth-command-builder.spec.ts b/test/clear-auth-command-builder.spec.ts
index dd1921a..86b1cef 100644
--- a/test/clear-auth-command-builder.spec.ts
+++ b/test/clear-auth-command-builder.spec.ts
@@ -3,8 +3,10 @@ import * as vorpal from 'vorpal';
 import { ClearAuthCommandBuilder } from '../src/clear-auth-command-builder';
 
 describe('clear-auth-command-builder', () => {
+  let vorpalInstance = null;
+
   it('adds command for each scheme', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -31,4 +33,8 @@ describe('clear-auth-command-builder', () => {
     expect(commands[0]._name).toBe('clear-auth bar-auth');
     expect(commands[1]._name).toBe('clear-auth foo-auth');
   });
+
+  afterEach(() => {
+    vorpalInstance.ui.removeAllListeners();
+  });
 });
diff --git a/test/operation-command-builder.spec.ts b/test/operation-command-builder.spec.ts
index 2def6bd..3268481 100644
--- a/test/operation-command-builder.spec.ts
+++ b/test/operation-command-builder.spec.ts
@@ -5,8 +5,10 @@ import { CommandGroupTypes } from '../src/command-group-types';
 import { OperationCommandBuilder } from '../src/operation-command-builder';
 
 describe('operation-command-builder', () => {
+  let vorpalInstance = null;
+
   it('adds option for request content type if operation specifies consumes values', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -38,7 +40,7 @@ describe('operation-command-builder', () => {
   });
 
   it('adds option for response body output if operation specifies produces values', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -67,7 +69,7 @@ describe('operation-command-builder', () => {
   });
 
   it('adds option for response content type if operation specifies produces values', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -99,7 +101,7 @@ describe('operation-command-builder', () => {
   });
 
   it('adds options for optional parameters', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -144,7 +146,7 @@ describe('operation-command-builder', () => {
   });
 
   it('uses specified parts as command name', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -175,7 +177,7 @@ describe('operation-command-builder', () => {
   });
 
   it('uses operation summary as command description', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -203,7 +205,7 @@ describe('operation-command-builder', () => {
   });
 
   it('sets alias from operation id if operation commands are being grouped', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -231,7 +233,7 @@ describe('operation-command-builder', () => {
   });
 
   it('sets no alias if operation commands are not being grouped', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -257,4 +259,8 @@ describe('operation-command-builder', () => {
 
     expect(command._aliases).not.toContain('foo-bar');
   });
+
+  afterEach(() => {
+    vorpalInstance.ui.removeAllListeners();
+  });
 });
diff --git a/test/set-auth-api-key-command-builder.spec.ts b/test/set-auth-api-key-command-builder.spec.ts
index 57455e8..c4b9acf 100644
--- a/test/set-auth-api-key-command-builder.spec.ts
+++ b/test/set-auth-api-key-command-builder.spec.ts
@@ -3,8 +3,10 @@ import * as vorpal from 'vorpal';
 import { SetAuthApiKeyCommandBuilder } from '../src/set-auth-api-key-command-builder';
 
 describe('set-auth-api-key-command-builder', () => {
+  let vorpalInstance = null;
+
   it('adds command for each apiKey scheme', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -31,4 +33,8 @@ describe('set-auth-api-key-command-builder', () => {
     expect(commands[0]._name).toBe('set-auth bar-auth');
     expect(commands[1]._name).toBe('set-auth foo-auth');
   });
+
+  afterEach(() => {
+    vorpalInstance.ui.removeAllListeners();
+  });
 });
diff --git a/test/set-auth-basic-command-builder.spec.ts b/test/set-auth-basic-command-builder.spec.ts
index dea5189..a4e971b 100644
--- a/test/set-auth-basic-command-builder.spec.ts
+++ b/test/set-auth-basic-command-builder.spec.ts
@@ -3,8 +3,10 @@ import * as vorpal from 'vorpal';
 import { SetAuthBasicCommandBuilder } from '../src/set-auth-basic-command-builder';
 
 describe('set-auth-basic-command-builder', () => {
+  let vorpalInstance = null;
+
   it('adds command for each basic scheme', () => {
-    const vorpalInstance = vorpal();
+    vorpalInstance = vorpal();
     const options = {
       interactive: false,
       operations: {
@@ -31,4 +33,8 @@ describe('set-auth-basic-command-builder', () => {
     expect(commands[0]._name).toBe('set-auth bar-auth');
     expect(commands[1]._name).toBe('set-auth foo-auth');
   });
+
+  afterEach(() => {
+    vorpalInstance.ui.removeAllListeners();
+  });
 });