Remove outdated test

__tests__/modifyConfig.test.js

@@ -1,58 +0,0 @@
-import postcss from 'postcss'
-import tailwind from '../src/index'
-
-test('plugins can add new theme values', () => {
-  return postcss([
-    tailwind({
-      corePlugins: [],
-      plugins: [
-        {
-          modifyConfig(config) {
-            return {
-              ...config,
-              theme: {
-                ...config.theme,
-                rotate: {
-                  '0': '0deg',
-                  '90': '90deg',
-                  '180': '180deg',
-                  '270': '270deg',
-                },
-              },
-            }
-          },
-          handler({ addUtilities, theme }) {
-            addUtilities(
-              Object.entries(theme('rotate')).map(([key, value]) => {
-                return {
-                  [`.rotate-${key}`]: {
-                    transform: `rotate(${value})`,
-                  },
-                }
-              })
-            )
-          },
-        },
-      ],
-    }),
-  ])
-    .process('@tailwind utilities;', { from: undefined })
-    .then(result => {
-      const expected = `
-        .rotate-0 {
-          transform: rotate(0deg)
-        }
-        .rotate-90 {
-          transform: rotate(90deg)
-        }
-        .rotate-180 {
-          transform: rotate(180deg)
-        }
-        .rotate-270 {
-          transform: rotate(270deg)
-        }
-      `
-
-      expect(result.css).toMatchCss(expected)
-    })
-})