diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2748,6 +2748,7 @@
     'PhabricatorDraftInterface' => 'applications/transactions/draft/PhabricatorDraftInterface.php',
     'PhabricatorDrydockApplication' => 'applications/drydock/application/PhabricatorDrydockApplication.php',
     'PhabricatorEdgeChangeRecord' => 'infrastructure/edges/util/PhabricatorEdgeChangeRecord.php',
+    'PhabricatorEdgeChangeRecordTestCase' => 'infrastructure/edges/__tests__/PhabricatorEdgeChangeRecordTestCase.php',
     'PhabricatorEdgeConfig' => 'infrastructure/edges/constants/PhabricatorEdgeConfig.php',
     'PhabricatorEdgeConstants' => 'infrastructure/edges/constants/PhabricatorEdgeConstants.php',
     'PhabricatorEdgeCycleException' => 'infrastructure/edges/exception/PhabricatorEdgeCycleException.php',
@@ -8173,6 +8174,7 @@
     'PhabricatorDraftEngine' => 'Phobject',
     'PhabricatorDrydockApplication' => 'PhabricatorApplication',
     'PhabricatorEdgeChangeRecord' => 'Phobject',
+    'PhabricatorEdgeChangeRecordTestCase' => 'PhabricatorTestCase',
     'PhabricatorEdgeConfig' => 'PhabricatorEdgeConstants',
     'PhabricatorEdgeConstants' => 'Phobject',
     'PhabricatorEdgeCycleException' => 'Exception',
diff --git a/src/infrastructure/edges/__tests__/PhabricatorEdgeChangeRecordTestCase.php b/src/infrastructure/edges/__tests__/PhabricatorEdgeChangeRecordTestCase.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/edges/__tests__/PhabricatorEdgeChangeRecordTestCase.php
@@ -0,0 +1,158 @@
+<?php
+
+final class PhabricatorEdgeChangeRecordTestCase extends PhabricatorTestCase {
+
+
+  public function testEdgeStorageFormats() {
+    $old_bulky = phutil_json_decode(<<<EOJSON
+{
+   "PHID-PROJ-5r2ed5v27xrgltvou5or" : {
+      "dataID" : null,
+      "dateCreated" : "1449170683",
+      "dst" : "PHID-PROJ-5r2ed5v27xrgltvou5or",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "type" : "41",
+      "data" : [],
+      "seq" : "0"
+   },
+   "PHID-PROJ-wh32nih7q5scvc5lvipv" : {
+      "dataID" : null,
+      "seq" : "0",
+      "type" : "41",
+      "data" : [],
+      "dst" : "PHID-PROJ-wh32nih7q5scvc5lvipv",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1449170691"
+   },
+   "PHID-PROJ-zfp44q7loir643b5i4v4" : {
+      "dataID" : null,
+      "type" : "41",
+      "data" : [],
+      "seq" : "0",
+      "dateCreated" : "1449170668",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dst" : "PHID-PROJ-zfp44q7loir643b5i4v4"
+   },
+   "PHID-PROJ-amvkc5zw2gsy7tyvocug" : {
+      "dataID" : null,
+      "dst" : "PHID-PROJ-amvkc5zw2gsy7tyvocug",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1448833330",
+      "seq" : "0",
+      "type" : "41",
+      "data" : []
+   },
+   "PHID-PROJ-3cuwfuuh4pwqyuof2hhr" : {
+      "dataID" : null,
+      "seq" : "0",
+      "type" : "41",
+      "data" : [],
+      "dst" : "PHID-PROJ-3cuwfuuh4pwqyuof2hhr",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1448899367"
+   },
+   "PHID-PROJ-okljqs7prifhajtvia3t" : {
+      "dataID" : null,
+      "seq" : "0",
+      "data" : [],
+      "type" : "41",
+      "dst" : "PHID-PROJ-okljqs7prifhajtvia3t",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1448902756"
+   }
+}
+EOJSON
+      );
+
+    $new_bulky = phutil_json_decode(<<<EOJSON
+{
+   "PHID-PROJ-5r2ed5v27xrgltvou5or" : {
+      "dataID" : null,
+      "dateCreated" : "1449170683",
+      "dst" : "PHID-PROJ-5r2ed5v27xrgltvou5or",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "type" : "41",
+      "data" : [],
+      "seq" : "0"
+   },
+   "PHID-PROJ-wh32nih7q5scvc5lvipv" : {
+      "dataID" : null,
+      "seq" : "0",
+      "type" : "41",
+      "data" : [],
+      "dst" : "PHID-PROJ-wh32nih7q5scvc5lvipv",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1449170691"
+   },
+   "PHID-PROJ-zfp44q7loir643b5i4v4" : {
+      "dataID" : null,
+      "type" : "41",
+      "data" : [],
+      "seq" : "0",
+      "dateCreated" : "1449170668",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dst" : "PHID-PROJ-zfp44q7loir643b5i4v4"
+   },
+   "PHID-PROJ-amvkc5zw2gsy7tyvocug" : {
+      "dataID" : null,
+      "dst" : "PHID-PROJ-amvkc5zw2gsy7tyvocug",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1448833330",
+      "seq" : "0",
+      "type" : "41",
+      "data" : []
+   },
+   "PHID-PROJ-3cuwfuuh4pwqyuof2hhr" : {
+      "dataID" : null,
+      "seq" : "0",
+      "type" : "41",
+      "data" : [],
+      "dst" : "PHID-PROJ-3cuwfuuh4pwqyuof2hhr",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1448899367"
+   },
+   "PHID-PROJ-zzzzqs7prifhajtvia3t" : {
+      "dataID" : null,
+      "seq" : "0",
+      "data" : [],
+      "type" : "41",
+      "dst" : "PHID-PROJ-zzzzqs7prifhajtvia3t",
+      "src" : "PHID-PSTE-5uj6oqv4kmhtr6ctwcq7",
+      "dateCreated" : "1448902756"
+   }
+}
+EOJSON
+      );
+
+    $old_slim = array(
+      'PHID-PROJ-okljqs7prifhajtvia3t',
+    );
+
+    $new_slim = array(
+      'PHID-PROJ-zzzzqs7prifhajtvia3t',
+    );
+
+    $bulky_xaction = new ManiphestTransaction();
+    $bulky_xaction->setOldValue($old_bulky);
+    $bulky_xaction->setNewValue($new_bulky);
+
+    $slim_xaction = new ManiphestTransaction();
+    $slim_xaction->setOldValue($old_slim);
+    $slim_xaction->setNewValue($new_slim);
+
+    $bulky_record = PhabricatorEdgeChangeRecord::newFromTransaction(
+      $bulky_xaction);
+
+    $slim_record = PhabricatorEdgeChangeRecord::newFromTransaction(
+      $slim_xaction);
+
+    $this->assertEqual(
+      $bulky_record->getAddedPHIDs(),
+      $slim_record->getAddedPHIDs());
+
+    $this->assertEqual(
+      $bulky_record->getRemovedPHIDs(),
+      $slim_record->getRemovedPHIDs());
+  }
+
+}