diff --git a/test/fixtures/transformation/destructuring/assignment-expression-statement-only/actual.js b/test/fixtures/transformation/destructuring/assignment-expression-statement-only/actual.js
new file mode 100644
index 0000000000..e5a17f6ca2
--- /dev/null
+++ b/test/fixtures/transformation/destructuring/assignment-expression-statement-only/actual.js
@@ -0,0 +1 @@
+console.log([x] = [1]);
diff --git a/test/fixtures/transformation/destructuring/assignment-expression-statement-only/options.json b/test/fixtures/transformation/destructuring/assignment-expression-statement-only/options.json
new file mode 100644
index 0000000000..56380df8e7
--- /dev/null
+++ b/test/fixtures/transformation/destructuring/assignment-expression-statement-only/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "AssignmentExpression destructuring outside of a ExpressionStatement is forbidden due to current 6to5 limitations"
+}
diff --git a/test/fixtures/transformation/react/display-name-variable-declaration/actual.js b/test/fixtures/transformation/react/display-name-variable-declaration/actual.js
index e352fe5706..2ce6d608db 100644
--- a/test/fixtures/transformation/react/display-name-variable-declaration/actual.js
+++ b/test/fixtures/transformation/react/display-name-variable-declaration/actual.js
@@ -1,5 +1,5 @@
 var Component = React.createClass({
   render: function () {
-  return null;
+    return null;
   }
 });
diff --git a/test/util.js b/test/util.js
index e7dfbff4ad..005ae5cdbf 100644
--- a/test/util.js
+++ b/test/util.js
@@ -3,8 +3,6 @@ var util   = require("../lib/6to5/util");
 var t      = require("../lib/6to5/types");
 
 suite("util", function () {
-  test("duplicate mutator map");
-
   test("invalid template", function () {
     assert.throws(function () {
       util.template("invalid template");
@@ -45,6 +43,34 @@ suite("util", function () {
     assert.deepEqual(util.list("foo,bar"), ["foo", "bar"]);
   });
 
+  test("arrayify", function () {
+    assert.deepEqual(util.arrayify(undefined), []);
+    assert.deepEqual(util.arrayify(false), []);
+    assert.deepEqual(util.arrayify(null), []);
+    assert.deepEqual(util.arrayify(""), []);
+    assert.deepEqual(util.arrayify("foo"), ["foo"]);
+    assert.deepEqual(util.arrayify("foo,bar"), ["foo", "bar"]);
+    assert.deepEqual(util.arrayify(["foo", "bar"]), ["foo", "bar"]);
+
+    assert.throws(function () {
+      util.arrayify({});
+    }, /illegal type for arrayify/);
+  });
+
+  test("regexify", function () {
+    assert.deepEqual(util.regexify(undefined), /(?:)/);
+    assert.deepEqual(util.regexify(false), /(?:)/);
+    assert.deepEqual(util.regexify(null), /(?:)/);
+    assert.deepEqual(util.regexify(""), /(?:)/);
+    assert.deepEqual(util.regexify(["foo", "bar"]), /foo|bar/);
+    assert.deepEqual(util.regexify("foobar"), /foobar/);
+    assert.deepEqual(util.regexify(/foobar/), /foobar/);
+
+    assert.throws(function () {
+      util.regexify({});
+    }, /illegal type for regexify/);
+  });
+
   test("getIds");
 
   test("toStatement");