fix: add tests and refactor slug utils

utils/slugs.test.js

@@ -0,0 +1,48 @@
+/* global describe expect it */
+
+const slugs = require('./slugs');
+
+describe('dasherize', () => {
+  const { dasherize } = slugs;
+  it('returns a string', () => {
+    expect(dasherize('')).toBe('');
+  });
+  it('converts characters to lower case', () => {
+    expect(dasherize('UPPERCASE')).toBe('uppercase');
+  });
+  it('converts spaces to dashes', () => {
+    expect(dasherize('  the space  between    ')).toBe(
+      '--the-space--between----'
+    );
+  });
+
+  it('removes everything except letters, numbers, - and .', () => {
+    expect(dasherize('1a!"£$%^*()_+=-.b2')).toBe('1a-.b2');
+  });
+});
+
+describe('nameify', () => {
+  const { nameify } = slugs;
+  it('returns a string', () => {
+    expect(nameify('')).toBe('');
+  });
+  it('removes everything except letters, numbers and spaces', () => {
+    expect(nameify('1A !"£$%^*()_+=-.b  2')).toBe('1A b  2');
+  });
+});
+
+describe('unDasherize', () => {
+  const { unDasherize } = slugs;
+  it('returns a string', () => {
+    expect(unDasherize('')).toBe('');
+  });
+  it('converts dashes to spaces', () => {
+    expect(unDasherize('the-space--between')).toBe('the space  between');
+  });
+  it('removes everything except letters, numbers and spaces', () => {
+    expect(unDasherize('1A !"£$%^*()_+=-.b  2')).toBe('1A  b  2');
+  });
+  it('trims off surrounding whitespace', () => {
+    expect(unDasherize('--the-space--between----')).toBe('the space  between');
+  });
+});