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diff --git a/accessible/tests/mochitest/states.js b/accessible/tests/mochitest/states.js
new file mode 100644
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+++ b/accessible/tests/mochitest/states.js
@@ -0,0 +1,266 @@
+////////////////////////////////////////////////////////////////////////////////
+// Helper functions for accessible states testing.
+//
+// requires:
+//   common.js
+//   role.js
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+// State constants
+
+// const STATE_BUSY is defined in common.js
+const STATE_CHECKED = nsIAccessibleStates.STATE_CHECKED;
+const STATE_CHECKABLE = nsIAccessibleStates.STATE_CHECKABLE;
+const STATE_COLLAPSED = nsIAccessibleStates.STATE_COLLAPSED;
+const STATE_DEFAULT = nsIAccessibleStates.STATE_DEFAULT;
+const STATE_EXPANDED = nsIAccessibleStates.STATE_EXPANDED;
+const STATE_EXTSELECTABLE = nsIAccessibleStates.STATE_EXTSELECTABLE;
+const STATE_FLOATING = nsIAccessibleStates.STATE_FLOATING;
+const STATE_FOCUSABLE = nsIAccessibleStates.STATE_FOCUSABLE;
+const STATE_FOCUSED = nsIAccessibleStates.STATE_FOCUSED;
+const STATE_HASPOPUP = nsIAccessibleStates.STATE_HASPOPUP;
+const STATE_INVALID = nsIAccessibleStates.STATE_INVALID;
+const STATE_INVISIBLE = nsIAccessibleStates.STATE_INVISIBLE;
+const STATE_LINKED = nsIAccessibleStates.STATE_LINKED;
+const STATE_MIXED = nsIAccessibleStates.STATE_MIXED;
+const STATE_MULTISELECTABLE = nsIAccessibleStates.STATE_MULTISELECTABLE;
+const STATE_OFFSCREEN = nsIAccessibleStates.STATE_OFFSCREEN;
+const STATE_PRESSED = nsIAccessibleStates.STATE_PRESSED;
+const STATE_PROTECTED = nsIAccessibleStates.STATE_PROTECTED;
+const STATE_READONLY = nsIAccessibleStates.STATE_READONLY;
+const STATE_REQUIRED = nsIAccessibleStates.STATE_REQUIRED;
+const STATE_SELECTABLE = nsIAccessibleStates.STATE_SELECTABLE;
+const STATE_SELECTED = nsIAccessibleStates.STATE_SELECTED;
+const STATE_TRAVERSED = nsIAccessibleStates.STATE_TRAVERSED;
+const STATE_UNAVAILABLE = nsIAccessibleStates.STATE_UNAVAILABLE;
+
+const EXT_STATE_ACTIVE = nsIAccessibleStates.EXT_STATE_ACTIVE;
+const EXT_STATE_DEFUNCT = nsIAccessibleStates.EXT_STATE_DEFUNCT;
+const EXT_STATE_EDITABLE = nsIAccessibleStates.EXT_STATE_EDITABLE;
+const EXT_STATE_ENABLED = nsIAccessibleStates.EXT_STATE_ENABLED;
+const EXT_STATE_EXPANDABLE = nsIAccessibleStates.EXT_STATE_EXPANDABLE;
+const EXT_STATE_HORIZONTAL = nsIAccessibleStates.EXT_STATE_HORIZONTAL;
+const EXT_STATE_MODAL = nsIAccessibleStates.EXT_STATE_MODAL;
+const EXT_STATE_MULTI_LINE = nsIAccessibleStates.EXT_STATE_MULTI_LINE;
+const EXT_STATE_PINNED = nsIAccessibleStates.EXT_STATE_PINNED;
+const EXT_STATE_SENSITIVE = nsIAccessibleStates.EXT_STATE_SENSITIVE;
+const EXT_STATE_SINGLE_LINE = nsIAccessibleStates.EXT_STATE_SINGLE_LINE;
+const EXT_STATE_STALE = nsIAccessibleStates.EXT_STATE_STALE;
+const EXT_STATE_SUPPORTS_AUTOCOMPLETION =
+  nsIAccessibleStates.EXT_STATE_SUPPORTS_AUTOCOMPLETION;
+const EXT_STATE_VERTICAL = nsIAccessibleStates.EXT_STATE_VERTICAL;
+
+const kOrdinalState = false;
+const kExtraState = 1;
+
+////////////////////////////////////////////////////////////////////////////////
+// Test functions
+
+/**
+ * Tests the states and extra states of the given accessible.
+ * Also tests for unwanted states and extra states.
+ * In addition, the function performs a few plausibility checks derived from the
+ * sstates and extra states passed in.
+ *
+ * @param aAccOrElmOrID      The accessible, DOM element or ID to be tested.
+ * @param aState             The state bits that are wanted.
+ * @param aExtraState        The extra state bits that are wanted.
+ * @param aAbsentState       State bits that are not wanted.
+ * @param aAbsentExtraState  Extra state bits that are not wanted.
+ * @param aTestName          The test name.
+ */
+function testStates(aAccOrElmOrID, aState, aExtraState, aAbsentState,
+                    aAbsentExtraState, aTestName)
+{
+  var [state, extraState] = getStates(aAccOrElmOrID);
+  var role = getRole(aAccOrElmOrID);
+  var id = prettyName(aAccOrElmOrID) + (aTestName ? " [" + aTestName + "]": "");
+
+  // Primary test.
+  if (aState) {
+    isState(state & aState, aState, false,
+            "wrong state bits for " + id + "!");
+  }
+
+  if (aExtraState)
+    isState(extraState & aExtraState, aExtraState, true,
+            "wrong extra state bits for " + id + "!");
+
+  if (aAbsentState)
+    isState(state & aAbsentState, 0, false,
+            "state bits should not be present in ID " + id + "!");
+
+  if (aAbsentExtraState)
+    isState(extraState & aAbsentExtraState, 0, true,
+            "extraState bits should not be present in ID " + id + "!");
+
+  // Additional test.
+
+  // focused/focusable
+  if (state & STATE_FOCUSED)
+    isState(state & STATE_FOCUSABLE, STATE_FOCUSABLE, false,
+            "Focussed " + id + " must be focusable!");
+
+  if (aAbsentState && (aAbsentState & STATE_FOCUSABLE)) {
+    isState(state & STATE_FOCUSED, 0, false,
+              "Not focusable " + id + " must be not focused!");
+  }
+
+  // multiline/singleline
+  if (extraState & EXT_STATE_MULTI_LINE)
+    isState(extraState & EXT_STATE_SINGLE_LINE, 0, true,
+            "Multiline " + id + " cannot be singleline!");
+
+  if (extraState & EXT_STATE_SINGLE_LINE)
+    isState(extraState & EXT_STATE_MULTI_LINE, 0, true,
+            "Singleline " + id + " cannot be multiline!");
+
+  // expanded/collapsed/expandable
+  if (state & STATE_COLLAPSED || state & STATE_EXPANDED)
+    isState(extraState & EXT_STATE_EXPANDABLE, EXT_STATE_EXPANDABLE, true,
+            "Collapsed or expanded " + id + " must be expandable!");
+
+  if (state & STATE_COLLAPSED)
+    isState(state & STATE_EXPANDED, 0, false,
+            "Collapsed " + id + " cannot be expanded!");
+
+  if (state & STATE_EXPANDED)
+    isState(state & STATE_COLLAPSED, 0, false,
+            "Expanded " + id + " cannot be collapsed!");
+
+  if (aAbsentState && (extraState & EXT_STATE_EXPANDABLE)) {
+    if (aAbsentState & STATE_EXPANDED) {
+      isState(state & STATE_COLLAPSED, STATE_COLLAPSED, false,
+              "Not expanded " + id + " must be collapsed!");
+    } else if (aAbsentState & STATE_COLLAPSED) {
+      isState(state & STATE_EXPANDED, STATE_EXPANDED, false,
+              "Not collapsed " + id + " must be expanded!");
+    }
+  }
+
+  // checked/mixed/checkable
+  if (state & STATE_CHECKED || state & STATE_MIXED &&
+      role != ROLE_TOGGLE_BUTTON && role != ROLE_PROGRESSBAR)
+    isState(state & STATE_CHECKABLE, STATE_CHECKABLE, false,
+            "Checked or mixed element must be checkable!");
+
+  if (state & STATE_CHECKED)
+    isState(state & STATE_MIXED, 0, false,
+            "Checked element cannot be state mixed!");
+
+  if (state & STATE_MIXED)
+    isState(state & STATE_CHECKED, 0, false,
+            "Mixed element cannot be state checked!");
+
+  // selected/selectable
+  if (state & STATE_SELECTED) {
+    isState(state & STATE_SELECTABLE, STATE_SELECTABLE, false,
+            "Selected element must be selectable!");
+  }
+}
+
+/**
+ * Tests an acessible and its sub tree for the passed in state bits.
+ * Used to make sure that states are propagated to descendants, for example the
+ * STATE_UNAVAILABLE from a container to its children.
+ *
+ * @param aAccOrElmOrID  The accessible, DOM element or ID to be tested.
+ * @param aState         The state bits that are wanted.
+ * @param aExtraState    The extra state bits that are wanted.
+ * @param aAbsentState   State bits that are not wanted.
+ */
+function testStatesInSubtree(aAccOrElmOrID, aState, aExtraState, aAbsentState)
+{
+  // test accessible and its subtree for propagated states.
+  var acc = getAccessible(aAccOrElmOrID);
+  if (!acc)
+    return;
+
+  if (getRole(acc) != ROLE_TEXT_LEAF)
+    // Right now, text leafs don't get tested because the states are not being
+    // propagated.
+    testStates(acc, aState, aExtraState, aAbsentState);
+
+  // Iterate over its children to see if the state got propagated.
+  var children = null;
+  try {
+    children = acc.children;
+  } catch(e) {}
+  ok(children, "Could not get children for " + aAccOrElmOrID +"!");
+
+  if (children) {
+    for (var i = 0; i < children.length; i++) {
+      var childAcc = children.queryElementAt(i, nsIAccessible);
+      testStatesInSubtree(childAcc, aState, aExtraState, aAbsentState);
+    }
+  }
+}
+
+/**
+ * Fails if no defunct state on the accessible.
+ */
+function testIsDefunct(aAccessible, aTestName)
+{
+  var id = prettyName(aAccessible) + (aTestName ? " [" + aTestName + "]" : "");
+  var [state, extraState] = getStates(aAccessible);
+  isState(extraState & EXT_STATE_DEFUNCT, EXT_STATE_DEFUNCT, true,
+          "no defuct state for " + id + "!");
+}
+
+function getStringStates(aAccOrElmOrID)
+{
+  var [state, extraState] = getStates(aAccOrElmOrID);
+  return statesToString(state, extraState);
+}
+
+function getStates(aAccOrElmOrID)
+{
+  var acc = getAccessible(aAccOrElmOrID);
+  if (!acc)
+    return [0, 0];
+
+  var state = {}, extraState = {};
+  acc.getState(state, extraState);
+
+  return [state.value, extraState.value];
+}
+
+/**
+ * Return true if the accessible has given states.
+ */
+function hasState(aAccOrElmOrID, aState, aExtraState)
+{
+  var [state, exstate] = getStates(aAccOrElmOrID);
+  return (aState ? state & aState : true) &&
+    (aExtraState ? exstate & aExtraState : true);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Private implementation details
+
+/**
+ * Analogy of SimpleTest.is function used to compare states.
+ */
+function isState(aState1, aState2, aIsExtraStates, aMsg)
+{
+  if (aState1 == aState2) {
+    ok(true, aMsg);
+    return;
+  }
+
+  var got = "0";
+  if (aState1) {
+    got = statesToString(aIsExtraStates ? 0 : aState1,
+                         aIsExtraStates ? aState1 : 0);
+  }
+
+  var expected = "0";
+  if (aState2) {
+    expected = statesToString(aIsExtraStates ? 0 : aState2,
+                              aIsExtraStates ? aState2 : 0);
+  }
+
+  ok(false, aMsg + "got '" + got + "', expected '" + expected + "'");
+}