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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 +1,365 @@
+// //////////////////////////////////////////////////////////////////////////////
+// Helper functions for accessible states testing.
+//
+// requires:
+//   common.js
+//   role.js
+//
+// //////////////////////////////////////////////////////////////////////////////
+/* import-globals-from common.js */
+/* import-globals-from role.js */
+
+// //////////////////////////////////////////////////////////////////////////////
+// State constants
+
+// const STATE_BUSY is defined in common.js
+const STATE_ANIMATED = nsIAccessibleStates.STATE_ANIMATED;
+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_CURRENT = nsIAccessibleStates.EXT_STATE_CURRENT;
+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 EXT_STATE_SELECTABLE_TEXT = nsIAccessibleStates.EXT_STATE_SELECTABLE_TEXT;
+const EXT_STATE_OPAQUE = nsIAccessibleStates.EXT_STATE_OPAQUE;
+
+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,
+      "Focused " + 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 && !(aAbsentState & STATE_SELECTABLE)) {
+    isState(
+      state & STATE_SELECTABLE,
+      STATE_SELECTABLE,
+      false,
+      "Selected element must be selectable!"
+    );
+  }
+}
+
+/**
+ * Tests an accessible 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 + "'");
+}