flow like the river

BACK_BACK/node_modules/tree/test/node.js

@@ -0,0 +1,35 @@
+module('Node', {
+  
+  setup: function() {
+    this.node1 = new Tree.Node();
+    this.node2 = new Tree.Node();
+    this.node3 = new Tree.Node();
+    this.branch = new Tree.Branch([this.node1, this.node2, this.node3]);
+  },
+  
+  teardown: function() {
+    delete this.node1;
+    delete this.node2;
+    delete this.node3;
+    delete this.branch;
+  }
+  
+});
+
+test('set index', function() {
+  this.node1.setIndex(1);
+  
+  equals(this.branch.size(), 3);
+  equals(_.first(this.branch.nodes), this.node2);
+  equals(_.last(this.branch.nodes), this.node3);
+
+  var error;
+  try {
+    var node = new Tree.Node({});
+    node.setIndex(1);
+  } catch (ex) {
+    error = ex;
+  }
+  
+  ok(error instanceof TypeError, 'handles a node with no branch');
+});