test: added test/simple/test-fs-watch-file.js

test/simple/test-fs-watch-file.js

@@ -0,0 +1,52 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+var path = require('path');
+var fs = require('fs');
+
+
+var filename = path.join(common.fixturesDir, 'watch.txt');
+fs.writeFileSync(filename, "hello");
+
+assert.throws(
+  function() {
+    fs.watchFile(filename);
+  },
+  function(e) {
+    return e.message === 'watchFile requires a listener function';
+  }
+);
+
+assert.doesNotThrow(
+  function() {
+    fs.watchFile(filename, function(curr, prev) {
+      fs.unwatchFile(filename);
+      fs.unlinkSync(filename);
+    });
+  }
+);
+
+setTimeout(function() {
+  fs.writeFileSync(filename, "world");
+}, 1000);
+