flow like the river

BACK_BACK/node_modules/falafel/test/parent.js

@@ -0,0 +1,33 @@
+var falafel = require('../');
+var test = require('tape');
+
+test('parent', function (t) {
+    t.plan(5);
+    
+    var src = '(function () {'
+        + 'var xs = [ 1, 2, 3 ];'
+        + 'fn(ys);'
+    + '})()';
+    
+    var output = falafel(src, function (node) {
+        if (node.type === 'ArrayExpression') {
+            t.equal(node.parent.type, 'VariableDeclarator');
+            t.equal(
+                ffBracket(node.parent.source()),
+                'xs = [ 1, 2, 3 ]'
+            );
+            t.equal(node.parent.parent.type, 'VariableDeclaration');
+            t.equal(
+                ffBracket(node.parent.parent.source()),
+                'var xs = [ 1, 2, 3 ];'
+            );
+            node.parent.update('ys = 4;');
+        }
+    });
+    
+    Function(['fn'], output)(function (x) { t.equal(x, 4) });
+});
+
+function ffBracket (s) {
+    return s.replace(/\[\s*/, '[ ').replace(/\s*\]/, ' ]');
+}