diff --git a/demo/src/utils/wordList.spec.ts b/demo/src/utils/wordList.spec.ts
index 0a6eb3a..78a8a84 100644
--- a/demo/src/utils/wordList.spec.ts
+++ b/demo/src/utils/wordList.spec.ts
@@ -1,69 +1,48 @@
 import { parseString, WhitespaceHandling } from './wordList';
 
-interface TestCase {
-	delimiter: string;
-	inputString: string;
-}
-
 const { Preserve, TrimLeadingAndTrailing } = WhitespaceHandling;
 
 describe('parseString', () => {
-	it('returns an empty array when input string is empty', () => {
-		function testInput(input: string): void {
-			const wordList = parseString(input, ',', Preserve);
+	it.each(['', null, undefined])(
+		'returns an empty array when input string is %p',
+		input => {
+			const wordList = parseString(input as string, ',', Preserve);
 			expect(wordList).toEqual([]);
 		}
+	);
 
-		['', null, undefined].forEach(val => testInput(val as string));
-	});
-
-	it('returns entire input string in array when delimiter is empty', () => {
-		function testDelimiter(delimiter: string): void {
+	it.each(['', null, undefined])(
+		'returns entire input string in array when delimiter is %p',
+		testDelimiter => {
+			const delimiter = testDelimiter as string;
 			const wordList = parseString(' some input string ', delimiter, Preserve);
 			expect(wordList).toEqual([' some input string ']);
 		}
+	);
 
-		['', null, undefined].forEach(val => testDelimiter(val as string));
-	});
-
-	it('returns entire input string in array when delimiter is not present in input string', () => {
-		function testDelimiter(delimiter: string): void {
+	it.each([',', '\n', '\t'])(
+		'returns entire input string in array when delimiter %p is not present in input string',
+		delimiter => {
 			const wordList = parseString(' some input string ', delimiter, Preserve);
 			expect(wordList).toEqual([' some input string ']);
 		}
-
-		[',', '\n', '\t'].forEach(testDelimiter);
-	});
-
-	it('splits input string by delimiter', () => {
-		const expectedResult = ['foo', 'Bar', ' b@z '];
-		const testCases: TestCase[] = [
-			{ delimiter: ',', inputString: 'foo,Bar, b@z ' },
-			{ delimiter: '\t', inputString: 'foo	Bar	 b@z ' },
-			{ delimiter: 'aaa', inputString: 'fooaaaBaraaa b@z ' },
-		];
-
-		function testSplit({ delimiter, inputString }: TestCase): void {
-			const wordList = parseString(inputString, delimiter, Preserve);
-			expect(wordList).toEqual(expectedResult);
-		}
-
-		testCases.forEach(testSplit);
+	);
+
+	it.each([
+		['foo,Bar, b@z ', ','],
+		['foo	Bar	 b@z ', '\t'],
+		['fooaaaBaraaa b@z ', 'aaa'],
+	])('splits input string %p by delimiter %p', (inputString, delimiter) => {
+		const wordList = parseString(inputString, delimiter, Preserve);
+		expect(wordList).toEqual(['foo', 'Bar', ' b@z ']);
 	});
 
-	it('splits input string by whitespace delimiter', () => {
-		const expectedResult = ['foo', 'Bar', 'b@z', ''];
-		const testCases: TestCase[] = [
-			{ delimiter: ' ', inputString: 'foo Bar b@z ' },
-			{ delimiter: '  ', inputString: 'foo  Bar  b@z  ' },
-		];
-
-		function testSplit({ delimiter, inputString }: TestCase): void {
-			const wordList = parseString(inputString, delimiter, Preserve);
-			expect(wordList).toEqual(expectedResult);
-		}
-
-		testCases.forEach(testSplit);
+	it.each([
+		['foo Bar b@z ', ' '],
+		['foo  Bar  b@z  ', '  '],
+	])('splits input string %p by delimiter %p', (inputString, delimiter) => {
+		const wordList = parseString(inputString, delimiter, Preserve);
+		expect(wordList).toEqual(['foo', 'Bar', 'b@z', '']);
 	});
 
 	it('splits multiline input string by newline delimiter', () => {
diff --git a/package.json b/package.json
index db53502..0e1ed9f 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,6 @@
     "@types/jest-when": "^2.7.0",
     "@typescript-eslint/eslint-plugin": "^2.2.0",
     "@typescript-eslint/parser": "^2.2.0",
-    "codecov": "^3.6.1",
     "eslint": "6.1.0",
     "eslint-config-airbnb-base": "14.0.0",
     "eslint-config-prettier": "^6.3.0",
@@ -61,12 +60,11 @@
     "eslint-plugin-jest": "^22.17.0",
     "husky": "^0.14.3",
     "jest": "^26.0.0",
-    "jest-when": "^2.7.0",
+    "jest-when": "^3.1.0",
     "npm-run-all": "^4.1.5",
     "prettier": "^1.13.7",
     "pretty-quick": "^1.6.0",
-    "regenerator-runtime": "^0.13.3",
-    "regex-to-strings": "^1.0.0",
+    "regex-to-strings": "^2.0.1",
     "rimraf": "^2.6.2",
     "ts-jest": "^26.4.4",
     "ts-loader": "^6.1.0",
diff --git a/src/utils/pattern.spec.ts b/src/utils/pattern.spec.ts
index c35b91b..6437bc1 100644
--- a/src/utils/pattern.spec.ts
+++ b/src/utils/pattern.spec.ts
@@ -1,5 +1,3 @@
-import 'regenerator-runtime/runtime';
-
 import { expandAll } from 'regex-to-strings';
 import { CharTrie } from '../types/charTrie';
 import { build } from './pattern';