diff --git a/.mocharc.json b/.mocharc.json
new file mode 100644
index 0000000..7f09281
--- /dev/null
+++ b/.mocharc.json
@@ -0,0 +1,4 @@
+{
+	"ui": "tdd",
+	"require": ["chai/register-assert"]
+}
diff --git a/test/basic-usage.js b/test/basic-usage.js
index 982095e..5ad9897 100644
--- a/test/basic-usage.js
+++ b/test/basic-usage.js
@@ -1,7 +1,6 @@
 "use strict";
 
 const getOpts = require("../index.js");
-const {assert} = require("chai");
 
 
 suite("Basic usage", () => {
diff --git a/test/duplicate-options.js b/test/duplicate-options.js
index c49075a..82d35cb 100644
--- a/test/duplicate-options.js
+++ b/test/duplicate-options.js
@@ -1,7 +1,6 @@
 "use strict";
 
 const getOpts = require("../index.js");
-const {assert} = require("chai");
 
 
 suite("Duplicate option handling", () => {
diff --git a/test/empty-input.js b/test/empty-input.js
index 30518f5..3faa928 100644
--- a/test/empty-input.js
+++ b/test/empty-input.js
@@ -1,7 +1,6 @@
 "use strict";
 
 const getOpts = require("../index.js");
-const {assert} = require("chai");
 
 
 suite("Empty input", () => {
diff --git a/test/mocha.opts b/test/mocha.opts
deleted file mode 100644
index 5efaf24..0000000
--- a/test/mocha.opts
+++ /dev/null
@@ -1 +0,0 @@
---ui tdd
diff --git a/test/string-input.js b/test/string-input.js
index d7afbcc..03ed6db 100644
--- a/test/string-input.js
+++ b/test/string-input.js
@@ -1,7 +1,6 @@
 "use strict";
 
 const getOpts = require("../index.js");
-const {assert} = require("chai");
 
 
 suite("String input", () => {
@@ -153,7 +152,7 @@ suite("String input", () => {
 		expect('"\\--foo"',   {"--foo": ""},     {argv: ["\\--foo"],   options: {}});
 		expect('"\\\\--foo"', {"--foo": ""},     {argv: ["\\--foo"],   options: {}});
 		
-		// Assert that parsing esaped option-strings won't have affect arrays
+		// Assert that parsing escaped option-strings won't affect arrays
 		expect(["\\--foo"],     {"--foo": ""}, {argv: ["\\--foo"],     options: {}});
 		expect(["\\ --foo"],    {"--foo": ""}, {argv: ["\\ --foo"],    options: {}});
 		expect(['"\\--foo"'],   {"--foo": ""}, {argv: ['"\\--foo"'],   options: {}});