diff --git a/composer.json b/composer.json
index 7786424..0dae765 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
     },
     "require-dev": {
         "phpdocumentor/phpdocumentor": "2.*",
-        "phpunit/phpunit": "@stable"
+        "phpunit/phpunit": "^5.7"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Agent.php b/src/Agent.php
index 8bed2bd..dbf6e78 100644
--- a/src/Agent.php
+++ b/src/Agent.php
@@ -54,14 +54,11 @@ public function asVersion($version) {
             if (! empty($versioned_acct)) {
                 $result['account'] = $versioned_acct;
             }
-        }
-        elseif (isset($this->mbox_sha1sum)) {
+        } else if (isset($this->mbox_sha1sum)) {
             $result['mbox_sha1sum'] = $this->mbox_sha1sum;
-        }
-        elseif (isset($this->mbox)) {
+        } else if (isset($this->mbox)) {
             $result['mbox'] = $this->mbox;
-        }
-        elseif (isset($this->openid)) {
+        } else if (isset($this->openid)) {
             $result['openid'] = $this->openid;
         }
 
@@ -149,6 +146,8 @@ public function getMbox_sha1sum() {
         if (isset($this->mbox)) {
             return sha1($this->mbox);
         }
+
+        return false;
     }
     public function setOpenid($value) { $this->openid = $value; return $this; }
     public function getOpenid() { return $this->openid; }
diff --git a/tests/AgentTest.php b/tests/AgentTest.php
index a027de8..4e3a680 100644
--- a/tests/AgentTest.php
+++ b/tests/AgentTest.php
@@ -69,6 +69,20 @@ public function testAsVersionMbox() {
         $this->assertEquals($versioned, $args, "serialized version matches corrected");
     }
 
+    // TODO: need to loop versions
+    public function testAsVersionOpenid() {
+        $args      = [
+            'openid' => COMMON_OPENID
+        ];
+
+        $obj       = Agent::fromJSON(json_encode($args, JSON_UNESCAPED_SLASHES));
+        $versioned = $obj->asVersion('1.0.0');
+
+        $args['objectType'] = 'Agent';
+
+        $this->assertEquals($versioned, $args, "serialized version matches corrected");
+    }
+
     public function testAsVersionMboxSha1() {
         $args      = [
             'mbox_sha1sum' => COMMON_MBOX_SHA1
@@ -201,6 +215,9 @@ public function testGetMbox_sha1sum() {
 
         $obj = new Agent(['mbox' => COMMON_MBOX]);
         $this->assertSame($obj->getMbox_sha1sum(), COMMON_MBOX_SHA1, 'sha1 from mbox');
+
+        $obj = new Agent();
+        $this->assertSame($obj->getMbox_sha1sum(), false, 'no mbox at all');
     }
 
     public function testCompareWithSignature() {
@@ -299,6 +316,18 @@ public function testCompareWithSignature() {
                 'sigArgs'     => ['account' => $acct2 ],
                 'reason'      => 'Comparison of account failed: Comparison of name failed: value is not the same'
             ],
+            [
+                'description' => 'missing object account',
+                'objArgs'     => [],
+                'sigArgs'     => ['account' => $acct2 ],
+                'reason'      => 'Comparison of account failed: value not in this'
+            ],
+            [
+                'description' => 'missing signature account',
+                'objArgs'     => ['account' => $acct1 ],
+                'sigArgs'     => [],
+                'reason'      => 'Comparison of account failed: value not in signature'
+            ],
 
             //
             // special cases where we can try to equate an mbox and an mbox SHA1 sum
diff --git a/tests/PersonTest.php b/tests/PersonTest.php
index bceb7e8..9b458b2 100644
--- a/tests/PersonTest.php
+++ b/tests/PersonTest.php
@@ -59,6 +59,9 @@ public function testAsVersion() {
         $obj = new Person(
             [
                 'mbox' => array(COMMON_MBOX),
+                'name' => COMMON_NAME,
+                'openid' => COMMON_OPENID,
+                'mbox_sha1sum' => COMMON_MBOX_SHA1,
                 'account' => array(
                     array(
                         'name' => COMMON_ACCT_NAME,
@@ -73,6 +76,9 @@ public function testAsVersion() {
             [
                 'objectType' => 'Person',
                 'mbox' => array(COMMON_MBOX),
+                'name' => COMMON_NAME,
+                'openid' => COMMON_OPENID,
+                'mbox_sha1sum' => COMMON_MBOX_SHA1,
                 'account' => array(
                     array(
                         'name' => COMMON_ACCT_NAME,