diff --git a/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff.ttx b/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff.ttx
index 665f8ab1c..4f94c37bc 100644
--- a/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff.ttx
+++ b/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff.ttx
@@ -39,15 +39,16 @@
           </Coverage>
           <ValueFormat1 value="4"/>
           <ValueFormat2 value="0"/>
-          <ClassDef1>
+          <ClassDef1 Format="2">
           </ClassDef1>
-          <ClassDef2>
+          <ClassDef2 Format="1">
             <ClassDef glyph="a" class="1"/>
           </ClassDef2>
           <!-- Class1Count=1 -->
           <!-- Class2Count=2 -->
           <Class1Record index="0">
             <Class2Record index="0">
+              <Value1 XAdvance="0"/>
             </Class2Record>
             <Class2Record index="1">
               <Value1 XAdvance="-40"/>
diff --git a/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff2.ttx b/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff2.ttx
index 947f195d9..e69c52fa0 100644
--- a/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff2.ttx
+++ b/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_diff2.ttx
@@ -40,16 +40,17 @@
           </Coverage>
           <ValueFormat1 value="4"/>
           <ValueFormat2 value="0"/>
-          <ClassDef1>
+          <ClassDef1 Format="1">
             <ClassDef glyph="A" class="1"/>
           </ClassDef1>
-          <ClassDef2>
+          <ClassDef2 Format="1">
             <ClassDef glyph="a" class="1"/>
           </ClassDef2>
           <!-- Class1Count=2 -->
           <!-- Class2Count=2 -->
           <Class1Record index="0">
             <Class2Record index="0">
+              <Value1 XAdvance="10"/>
             </Class2Record>
             <Class2Record index="1">
               <Value1 XAdvance="10"/>
@@ -57,6 +58,7 @@
           </Class1Record>
           <Class1Record index="1">
             <Class2Record index="0">
+              <Value1 XAdvance="0"/>
             </Class2Record>
             <Class2Record index="1">
               <Value1 XAdvance="-40"/>
diff --git a/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_same.ttx b/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_same.ttx
index 06d7f8c65..987253361 100644
--- a/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_same.ttx
+++ b/Tests/varLib/data/test_results/InterpolateLayoutGPOS_2_class_same.ttx
@@ -39,15 +39,16 @@
           </Coverage>
           <ValueFormat1 value="4"/>
           <ValueFormat2 value="0"/>
-          <ClassDef1>
+          <ClassDef1 Format="2">
           </ClassDef1>
-          <ClassDef2>
+          <ClassDef2 Format="1">
             <ClassDef glyph="a" class="1"/>
           </ClassDef2>
           <!-- Class1Count=1 -->
           <!-- Class2Count=2 -->
           <Class1Record index="0">
             <Class2Record index="0">
+              <Value1 XAdvance="0"/>
             </Class2Record>
             <Class2Record index="1">
               <Value1 XAdvance="-53"/>