Updated the test system

test/toCamelCase.test.js

@@ -0,0 +1,48 @@
+const expect = require('expect');
+const {toCamelCase} = require('./_30s.js');
+
+test('toCamelCase is a Function', () => {
+  expect(toCamelCase).toBeInstanceOf(Function);
+});
+test("toCamelCase('some_database_field_name') returns someDatabaseFieldName", () => {
+  expect(toCamelCase('some_database_field_name')).toBe('someDatabaseFieldName');
+});
+test("toCamelCase('Some label that needs to be camelized') returns someLabelThatNeedsToBeCamelized", () => {
+  expect(toCamelCase('Some label that needs to be camelized')).toBe(
+    'someLabelThatNeedsToBeCamelized'
+  );
+});
+test("toCamelCase('some-javascript-property') return someJavascriptProperty", () => {
+  expect(toCamelCase('some-javascript-property')).toBe('someJavascriptProperty');
+});
+test("toCamelCase('some-mixed_string with spaces_underscores-and-hyphens') returns someMixedStringWithSpacesUnderscoresAndHyphens", () => {
+  expect(toCamelCase('some-mixed_string with spaces_underscores-and-hyphens')).toBe(
+    'someMixedStringWithSpacesUnderscoresAndHyphens'
+  );
+});
+test('toCamelCase() throws a error', () => {
+  expect(() => {
+    toCamelCase();
+  }).toThrow();
+});
+test('toCamelCase([]) throws a error', () => {
+  expect(() => {
+    toCamelCase([]);
+  }).toThrow();
+});
+test('toCamelCase({}) throws a error', () => {
+  expect(() => {
+    toCamelCase({});
+  }).toThrow();
+});
+test('toCamelCase(123) throws a error', () => {
+  expect(() => {
+    toCamelCase(123);
+  }).toThrow();
+});
+let start = new Date().getTime();
+toCamelCase('some-mixed_string with spaces_underscores-and-hyphens');
+let end = new Date().getTime();
+test('toCamelCase(some-mixed_string with spaces_underscores-and-hyphens) takes less than 2s to run', () => {
+  expect(end - start < 2000).toBeTruthy();
+});