Test directory up-to-date

test/celsiusToFahrenheit.test.js

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+const expect = require('expect');
+const {celsiusToFahrenheit} = require('./_30s.js');
+
+test('celsiusToFahrenheit is a Function', () => {
+  expect(celsiusToFahrenheit).toBeInstanceOf(Function);
+});
+
+test('0 Celsius is 32 Fahrenheit', () => {
+  expect(celsiusToFahrenheit(0)).toBe(32)
+})
+
+test('100 Celsius is 212 Fahrenheit', () => {
+	expect(celsiusToFahrenheit(100)).toBe(212)
+})
+
+test('-50 Celsius is -58 Fahrenheit', () => {
+	expect(celsiusToFahrenheit(-50)).toBe(-58)
+})
+
+test('1000 Celsius is 1832 Fahrenheit', () => {
+	expect(celsiusToFahrenheit(1000)).toBe(1832)
+})
+
+test('Not a number value is NaN', () => {
+	expect(celsiusToFahrenheit("Durr")).toBe(NaN)
+})