nested autorun test

packages/deps/deps_tests.js

@@ -44,3 +44,99 @@ Tinytest.add('deps - autorun', function (test) {
   // Still 6!
   test.equal(x, 6);
 });
+
+Tinytest.add("deps - nested autorun", function (test) {
+  var a = new Deps.Variable;
+  var b = new Deps.Variable;
+  var c = new Deps.Variable;
+  var d = new Deps.Variable;
+  var e = new Deps.Variable;
+  var f = new Deps.Variable;
+
+  var buf = "";
+
+  var c1 = new Deps.Computation;
+  c1.run(function () {
+    Deps.depend(a);
+    buf += 'a';
+    Deps.autorun(function () {
+      Deps.depend(b);
+      buf += 'b';
+      Deps.autorun(function () {
+        Deps.depend(c);
+        buf += 'c';
+        var c2 = new Deps.Computation;
+        c2.run(function () {
+          Deps.depend(d);
+          buf += 'd';
+          Deps.autorun(function () {
+            Deps.depend(e);
+            buf += 'e';
+            Deps.autorun(function () {
+              Deps.depend(f);
+              buf += 'f';
+            });
+          });
+        });
+        Deps.currentComputation.onInvalidate(function () {
+          c2.invalidate();
+        });
+      });
+    });
+  });
+
+  var expect = function (str) {
+    test.equal(buf, str);
+    buf = "";
+  };
+
+  expect('abcdef');
+
+  b.changed();
+  expect(''); // didn't flush yet
+  Deps.flush();
+  expect('bcdef');
+
+  c.changed();
+  Deps.flush();
+  expect('cdef');
+
+  var changeAndExpect = function (v, str) {
+    v.changed();
+    Deps.flush();
+    expect(str);
+  };
+
+  // more autoruns
+  changeAndExpect(e, 'ef');
+  changeAndExpect(f, 'f');
+  // invalidate inner context
+  changeAndExpect(d, '');
+  // no more autorunning!
+  changeAndExpect(e, '');
+  changeAndExpect(f, '');
+  // re-autorun C
+  changeAndExpect(c, 'cdef');
+  changeAndExpect(e, 'ef');
+  changeAndExpect(f, 'f');
+  // re-autorun B
+  changeAndExpect(b, 'bcdef');
+  changeAndExpect(e, 'ef');
+  changeAndExpect(f, 'f');
+  // kill A
+  a.changed();
+  Deps.flush(); // why is this necessary?
+  changeAndExpect(f, '');
+  changeAndExpect(e, '');
+  changeAndExpect(d, '');
+  changeAndExpect(c, '');
+  changeAndExpect(b, '');
+  changeAndExpect(a, '');
+
+  test.isFalse(a.hasDependents());
+  test.isFalse(b.hasDependents());
+  test.isFalse(c.hasDependents());
+  test.isFalse(d.hasDependents());
+  test.isFalse(e.hasDependents());
+  test.isFalse(f.hasDependents());
+});