Added some more tests to bump coverage back up.

Signed-off-by: Dave Shanley <dave@quobix.com>

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:`