diff --git a/test/MemberBuilder/MethodTest.js b/test/MemberBuilder/MethodTest.js
index d025f51..767f754 100644
--- a/test/MemberBuilder/MethodTest.js
+++ b/test/MemberBuilder/MethodTest.js
@@ -22,6 +22,8 @@
  * @package test
  */
 
+var shared = require( __dirname + '/inc-common' );
+
 require( 'common' ).testCase(
 {
     caseSetUp: function()
@@ -30,45 +32,28 @@ require( 'common' ).testCase(
 
         this.testArgs = function( args, name, value, keywords )
         {
-            var pub = _self.members[ 'public' ],
-
-                // prev data
-                pval_expect      = null,
-                pkeywords_expect = null,
-                pval_given       = null,
-                pkeywords_given  = null
-            ;
-
-            if ( pub[ name ] )
+            shared.testArgs( _self, args, name, value, keywords, function(
+                prev_default, pval_given, pkey_given
+            )
             {
-                pval_expect      = pub[ name ];
-                pkeywords_expect = pval_expect.___$$keywords$$; // XXX
+                var expected = _self.members[ 'public' ][ name ];
 
-                pval_given      = args[ 3 ].member;
-                pkeywords_given = args[ 4 ];
-            }
+                if ( !expected )
+                {
+                    return prev_default;
+                }
 
-            _self.assertEqual( name, args[ 0 ],
-                'Incorrect name passed to method validator'
-            );
-
-            _self.assertStrictEqual( value, args[ 1 ],
-                'Incorrect value passed to method validator'
-            );
-
-            _self.assertStrictEqual( keywords, args[ 2 ],
-                'Incorrect keywords passed to method validator'
-            );
-
-            _self.assertStrictEqual( pval_expect, pval_given,
-                'Previous data should contain prev value if overriding, ' +
-                'otherwise null'
-            );
-
-            _self.assertStrictEqual( pkeywords_expect, pkeywords_given,
-                'Previous keywords should contain prev keyword if ' +
-                'overriding, otherwise null'
-            );
+                return {
+                    value: {
+                        expected: expected,
+                        given:    pval_given.member,
+                    },
+                    keywords: {
+                        expected: expected.___$$keywords$$, // XXX
+                        given:    pkey_given,
+                    },
+                };
+            } );
         };
     },
 
diff --git a/test/MemberBuilder/PropTest.js b/test/MemberBuilder/PropTest.js
index 1b5f651..7844cc5 100644
--- a/test/MemberBuilder/PropTest.js
+++ b/test/MemberBuilder/PropTest.js
@@ -22,6 +22,8 @@
  * @package test
  */
 
+var shared = require( __dirname + '/inc-common' );
+
 require( 'common' ).testCase(
 {
     caseSetUp: function()
@@ -30,45 +32,28 @@ require( 'common' ).testCase(
 
         this.testArgs = function( args, name, value, keywords )
         {
-            var pub = _self.members[ 'public' ],
-
-                // prev data
-                pval_expect      = null,
-                pkeywords_expect = null,
-                pval_given       = null,
-                pkeywords_given  = null
-            ;
-
-            if ( pub[ name ] )
+            shared.testArgs( _self, args, name, value, keywords, function(
+                prev_default, pval_given, pkey_given
+            )
             {
-                pval_expect      = pub[ name ][ 0 ];
-                pkeywords_expect = pub[ name ][ 1 ];
+                var expected = _self.members[ 'public' ][ name ];
 
-                pval_given      = args[ 3 ].member[ 0 ];
-                pkeywords_given = args[ 4 ];
-            }
+                if ( !expected )
+                {
+                    return prev_default;
+                }
 
-            _self.assertEqual( name, args[ 0 ],
-                'Incorrect name passed to property validator'
-            );
-
-            _self.assertStrictEqual( value, args[ 1 ],
-                'Incorrect value passed to property validator'
-            );
-
-            _self.assertStrictEqual( keywords, args[ 2 ],
-                'Incorrect keywords passed to property validator'
-            );
-
-            _self.assertStrictEqual( pval_expect, pval_given,
-                'Previous data should contain prev value if overriding, ' +
-                'otherwise null'
-            );
-
-            _self.assertStrictEqual( pkeywords_expect, pkeywords_given,
-                'Previous keywords should contain prev keyword if ' +
-                'overriding, otherwise null'
-            );
+                return {
+                    value: {
+                        expected: expected[ 0 ],
+                        given:    pval_given.member[ 0 ],
+                    },
+                    keywords: {
+                        expected: expected[ 1 ],
+                        given:    pkey_given,
+                    },
+                };
+            } );
         };
     },
 
diff --git a/test/MemberBuilder/inc-common.js b/test/MemberBuilder/inc-common.js
new file mode 100644
index 0000000..0a7250d
--- /dev/null
+++ b/test/MemberBuilder/inc-common.js
@@ -0,0 +1,67 @@
+/**
+ * Shared functions for MemberBuilder tests
+ *
+ *  Copyright (C) 2010 Mike Gerwitz
+ *
+ *  This file is part of ease.js.
+ *
+ *  ease.js is free software: you can redistribute it and/or modify it under the
+ *  terms of the GNU Lesser General Public License as published by the Free
+ *  Software Foundation, either version 3 of the License, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author  Mike Gerwitz
+ * @package test
+ */
+
+/**
+ * Perform common assertions on validator arguments
+ *
+ * @param {Object}     testcase   test case being executed
+ * @param {arguments}  args       arguments to check
+ * @param {string}     name       member name
+ * @param {*}          value      expected value
+ * @param {Object}     keywords   expected keywords
+ * @param {function()} prevLookup function to use to look up prev member data
+ *
+ * @return {undefined}
+ */
+exports.testArgs = function( testcase, args, name, value, keywords, prevLookup )
+{
+    var prev = {
+        value:    { expected: null, given: args[ 3 ] },
+        keywords: { expected: null, given: args[ 4 ] },
+    };
+
+    prev = prevLookup( prev, prev.value.given, prev.keywords.given );
+
+    testcase.assertEqual( name, args[ 0 ],
+        'Incorrect name passed to validator'
+    );
+
+    testcase.assertStrictEqual( value, args[ 1 ],
+        'Incorrect value passed to validator'
+    );
+
+    testcase.assertStrictEqual( keywords, args[ 2 ],
+        'Incorrect keywords passed to validator'
+    );
+
+    testcase.assertStrictEqual( prev.value.expected, prev.value.given,
+        'Previous data should contain prev value if overriding, ' +
+        'otherwise null'
+    );
+
+    testcase.assertStrictEqual( prev.keywords.expected, prev.keywords.given,
+        'Previous keywords should contain prev keyword if ' +
+        'overriding, otherwise null'
+    );
+};