Test migration to jest by hand

Apparently using regular expressions is way easier.

test/toCamelCase/toCamelCase.js

@@ -0,0 +1,10 @@
+const toCamelCase = str => {
+let s =
+str &&
+str
+.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
+.map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())
+.join('');
+return s.slice(0, 1).toLowerCase() + s.slice(1);
+};
+module.exports = toCamelCase;

test/toCamelCase/toCamelCase.test.js

@@ -0,0 +1,24 @@
+const expect = require('expect');
+const toCamelCase = require('./toCamelCase.js');
+
+
+  test('toCamelCase is a Function', () => {
+  expect(toCamelCase).toBeInstanceOf(Function);
+});
+  t.equal(toCamelCase('some_database_field_name'), 'someDatabaseFieldName', "toCamelCase('some_database_field_name') returns someDatabaseFieldName");
+  t.equal(toCamelCase('Some label that needs to be camelized'), 'someLabelThatNeedsToBeCamelized', "toCamelCase('Some label that needs to be camelized') returns someLabelThatNeedsToBeCamelized");
+  t.equal(toCamelCase('some-javascript-property'), 'someJavascriptProperty', "toCamelCase('some-javascript-property') return someJavascriptProperty");
+  t.equal(toCamelCase('some-mixed_string with spaces_underscores-and-hyphens'), 'someMixedStringWithSpacesUnderscoresAndHyphens', "toCamelCase('some-mixed_string with spaces_underscores-and-hyphens') returns someMixedStringWithSpacesUnderscoresAndHyphens");
+  t.throws(() => toCamelCase(), 'toCamelCase() throws a error');
+  t.throws(() => toCamelCase([]), 'toCamelCase([]) throws a error');
+  t.throws(() => toCamelCase({}), 'toCamelCase({}) throws a error');
+  t.throws(() => toCamelCase(123), 'toCamelCase(123) throws a error');
+
+  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();
+});
+  
+