Add class list tests

tests/getClassList.test.js

@@ -26,3 +26,36 @@ it('should generate every possible class, without variants', () => {
 
   expect(classes).not.toContain('-m-DEFAULT')
 })
+
+it('should generate every possible class while handling negatives and prefixes', () => {
+  let config = { prefix: 'tw-' }
+  let context = createContext(resolveConfig(config))
+  let classes = context.getClassList()
+  expect(classes).toBeInstanceOf(Array)
+
+  // Verify we have a `container` for the 'components' section.
+  expect(classes).toContain('tw-container')
+
+  // Verify we handle the DEFAULT case correctly
+  expect(classes).toContain('tw-border')
+
+  // Verify we handle negative values correctly
+  expect(classes).toContain('-tw-inset-1/4')
+  expect(classes).toContain('-tw-m-0')
+  expect(classes).not.toContain('-tw-uppercase')
+  expect(classes).not.toContain('-tw-opacity-50')
+
+  // These utilities do work but there's no reason to generate
+  // them alongside the `-{prefix}-{utility}` versions
+  expect(classes).not.toContain('tw--inset-1/4')
+  expect(classes).not.toContain('tw--m-0')
+
+  config = {
+    prefix: 'tw-',
+    theme: { extend: { margin: { DEFAULT: '5px' } } },
+  }
+  context = createContext(resolveConfig(config))
+  classes = context.getClassList()
+
+  expect(classes).not.toContain('-tw-m-DEFAULT')
+})