diff --git a/datamodel/low/extraction_functions_test.go b/datamodel/low/extraction_functions_test.go
index 53e8580..71b8e53 100644
--- a/datamodel/low/extraction_functions_test.go
+++ b/datamodel/low/extraction_functions_test.go
@@ -1004,6 +1004,39 @@ one:
 	}
 }
 
+func TestExtractMap_NoLookupWithExtensions_UsingMerge(t *testing.T) {
+
+	yml := `components:`
+
+	var idxNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &idxNode)
+	assert.NoError(t, mErr)
+	idx := index.NewSpecIndex(&idxNode)
+
+	yml = `x-yeah: &yeah
+  night: fun
+x-hey: you
+one:
+  x-choo: choo
+  <<: *yeah`
+
+	var cNode yaml.Node
+	e := yaml.Unmarshal([]byte(yml), &cNode)
+	assert.NoError(t, e)
+
+	things, err := ExtractMapNoLookupExtensions[*test_Good](cNode.Content[0], idx, true)
+	assert.NoError(t, err)
+	assert.Len(t, things, 3)
+
+	for k, v := range things {
+		if k.Value == "x-hey" || k.Value == "x-yeah" || k.Value == "night" || k.Value == "<<" {
+			continue
+		}
+		assert.Equal(t, "one", k.Value)
+		assert.Len(t, v.ValueNode.Content, 6)
+	}
+}
+
 func TestExtractMap_NoLookupWithoutExtensions(t *testing.T) {
 
 	yml := `components:`
diff --git a/utils/utils_test.go b/utils/utils_test.go
index 4165f97..5721052 100644
--- a/utils/utils_test.go
+++ b/utils/utils_test.go
@@ -802,6 +802,33 @@ thangs: *anchorA`
 
 }
 
+func TestNodeAlias_Nil(t *testing.T) {
+	ref := NodeAlias(nil)
+	assert.Nil(t, ref)
+}
+
+func TestNodeAlias_IsNodeAlias_Nil(t *testing.T) {
+
+	_, isAlias := IsNodeAlias(nil)
+	assert.False(t, isAlias)
+
+}
+
+func TestNodeAlias_IsNodeAlias_False(t *testing.T) {
+
+	yml := `things:
+  - Stuff
+  - Junk
+thangs: none`
+
+	var node yaml.Node
+	_ = yaml.Unmarshal([]byte(yml), &node)
+
+	_, isAlias := IsNodeAlias(node.Content[0].Content[3])
+	assert.False(t, isAlias)
+
+}
+
 func TestCheckForMergeNodes(t *testing.T) {
 
 	yml := `x-common-definitions:
@@ -850,6 +877,15 @@ func TestIsNodeRefValue_False(t *testing.T) {
 	assert.Empty(t, val)
 }
 
+func TestIsNodeRefValue_Nil(t *testing.T) {
+
+	ref, node, val := IsNodeRefValue(nil)
+
+	assert.False(t, ref)
+	assert.Nil(t, node)
+	assert.Empty(t, val)
+}
+
 func TestCheckEnumForDuplicates_Success(t *testing.T) {
 	yml := "- yes\n- no\n- crisps"
 	var rootNode yaml.Node