Adding high base model tests

these were covered when used by v3 models, but need new tests when moved into a seperate package.

datamodel/high/base/example_test.go

@@ -0,0 +1,41 @@
+// Copyright 2022 Princess B33f Heavy Industries / Dave Shanley
+// SPDX-License-Identifier: MIT
+
+package base
+
+import (
+	lowmodel "github.com/pb33f/libopenapi/datamodel/low"
+	lowbase "github.com/pb33f/libopenapi/datamodel/low/base"
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/yaml.v3"
+	"testing"
+)
+
+func TestNewExample(t *testing.T) {
+
+	var cNode yaml.Node
+
+	yml := `summary: an example
+description: something more
+value: a thing
+externalValue: https://pb33f.io
+x-hack: code`
+
+	_ = yaml.Unmarshal([]byte(yml), &cNode)
+
+	// build low
+	var lowExample lowbase.Example
+	_ = lowmodel.BuildModel(&cNode, &lowExample)
+
+	_ = lowExample.Build(cNode.Content[0], nil)
+
+	// build high
+	highExample := NewExample(&lowExample)
+
+	assert.Equal(t, "an example", highExample.Summary)
+	assert.Equal(t, "something more", highExample.Description)
+	assert.Equal(t, "https://pb33f.io", highExample.ExternalValue)
+	assert.Equal(t, "code", highExample.Extensions["x-hack"])
+	assert.Equal(t, "a thing", highExample.Value)
+	assert.Equal(t, 4, highExample.GoLow().ExternalValue.ValueNode.Line)
+}