feat| create spec files

Author: nik-rev

13_factorial/factorial.spec.js

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+const factorial = require("./factorial");
+
+describe('factorial', () => {
+  test('4th factorial number is 24', () => {
+    expect(factorial(4)).toBe(24);
+  });
+  test.skip('6th factorial number is 720', () => {
+    expect(factorial(6)).toBe(720);
+  });
+  test.skip('10th factorial number is 3628800', () => {
+    expect(factorial(10)).toBe(3628800);
+  });
+  test.skip('15th factorial number is 1.3076744e+12', () => {
+    expect(factorial(15)).toBe(1.3076744e12);
+  });
+  test.skip('25th factorial number is 1.551121e+25', () => {
+    expect(factorial(25)).toBe(1.551121e25);
+  });
+  test.skip('0th factorial number is 1', () => {
+    expect(factorial(0)).toBe(1);
+  });
+  test.skip('doesn\'t accept negatives', () => {
+    expect(factorial(-25)).toBe(undefined);
+  });
+  test.skip('doesn\'t accept floats', () => {
+    expect(factorial(5.4)).toBe(undefined);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("0")).toBe(1);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("1")).toBe(1);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("2")).toBe(2);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("8")).toBe(40320);
+  });
+});

13_factorial/solution/factorial-solution.spec.js

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+const factorial = require("./factorial-solution");
+
+describe('factorial', () => {
+  test('4th factorial number is 24', () => {
+    expect(factorial(4)).toBe(24);
+  });
+  test.skip('6th factorial number is 720', () => {
+    expect(factorial(6)).toBe(720);
+  });
+  test.skip('10th factorial number is 3628800', () => {
+    expect(factorial(10)).toBe(3628800);
+  });
+  test.skip('15th factorial number is 1.3076744e+12', () => {
+    expect(factorial(15)).toBe(1.3076744e12);
+  });
+  test.skip('25th factorial number is 1.551121e+25', () => {
+    expect(factorial(25)).toBe(1.551121e25);
+  });
+  test.skip('0th factorial number is 1', () => {
+    expect(factorial(0)).toBe(1);
+  });
+  test.skip('doesn\'t accept negatives', () => {
+    expect(factorial(-25)).toBe(undefined);
+  });
+  test.skip('doesn\'t accept floats', () => {
+    expect(factorial(5.4)).toBe(undefined);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("0")).toBe(1);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("1")).toBe(1);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("2")).toBe(2);
+  });
+  test.skip('DOES accept strings', () => {
+    expect(factorial("8")).toBe(40320);
+  });
+});