Add copyFileFallback tests when running on more recent Node

lib/copy-sync/__tests__/copyfilesync-fallback.test.js

@@ -0,0 +1,26 @@
+const fs = require('fs')
+const path = require('path')
+
+/* global after, describe */
+
+if (typeof fs.copyFileSync === 'function') {
+  // Re-run all copySync tests without fs.copyFileSync
+  describe('> when using copyFileSyncFallback', () => {
+    const originalCopyFile = fs.copyFileSync
+
+    after(done => {
+      fs.copyFileSync = originalCopyFile
+      done()
+    })
+
+    delete fs.copyFileSync
+    const fallbackTest = path.basename(__filename)
+    fs.readdirSync(__dirname)
+      .filter(filename => filename.endsWith('.test.js') && filename !== fallbackTest)
+      .map(filename => {
+        const testModule = `./${filename}`
+        delete require.cache[require.resolve(testModule)]
+        require(testModule)
+      })
+  })
+}

lib/copy/__tests__/copyfile-fallback.test.js

@@ -0,0 +1,26 @@
+const fs = require('fs')
+const path = require('path')
+
+/* global after, describe */
+
+if (typeof fs.copyFile === 'function') {
+  // Re-run all copy tests without fs.copyFile
+  describe('> when using copyFileFallback', () => {
+    const originalCopyFile = fs.copyFile
+
+    after(done => {
+      fs.copyFile = originalCopyFile
+      done()
+    })
+
+    delete fs.copyFile
+    const fallbackTest = path.basename(__filename)
+    fs.readdirSync(__dirname)
+      .filter(filename => filename.endsWith('.test.js') && filename !== fallbackTest)
+      .map(filename => {
+        const testModule = `./${filename}`
+        delete require.cache[require.resolve(testModule)]
+        require(testModule)
+      })
+  })
+}