Test directory up-to-date

test/fahrenheitToCelsius.test.js

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+const expect = require('expect');
+const {fahrenheitToCelsius} = require('./_30s.js');
+
+test('fahrenheitToCelsius is a Function', () => {
+  expect(fahrenheitToCelsius).toBeInstanceOf(Function);
+});
+
+test('32 Fahrenheit is 0 Celsius', () => {
+	expect(fahrenheitToCelsius(32)).toBe(0)
+})
+
+test('212 Fahrenheit is 100 Celsius', () => {
+	expect(fahrenheitToCelsius(212)).toBe(100)
+})
+
+test('150 Fahrenheit is 65.55555555555556 Celsius', () => {
+	expect(fahrenheitToCelsius(150)).toBe(65.55555555555556)
+})
+
+test('1000 Fahrenheit is 537.7777777777778', () => {
+	expect(fahrenheitToCelsius(1000)).toBe(537.7777777777778)
+})
+
+test('Not a number value is NaN', () => {
+	expect(fahrenheitToCelsius("Durr")).toBe(NaN)
+})