Add struct tag to Buildpack.Path field

buildpack.go

@@ -91,7 +91,7 @@ type Buildpack struct {
 	Info BuildpackInfo `toml:"buildpack"`
 
 	// Path is the path to the buildpack.
-	Path string
+	Path string `toml:"-"`
 
 	// Stacks is the collection of stacks supported by the buildpack.
 	Stacks []BuildpackStack `toml:"stacks"`

buildpack_test.go

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package libcnb_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/BurntSushi/toml"
+	"github.com/buildpacks/libcnb"
+	"github.com/sclevine/spec"
+
+	. "github.com/onsi/gomega"
+)
+
+func testBuildpackTOML(t *testing.T, context spec.G, it spec.S) {
+	var (
+		Expect = NewWithT(t).Expect
+	)
+
+	it("does not serialize the Path field", func() {
+		bp := libcnb.Buildpack{
+			API: "0.6",
+			Info: libcnb.BuildpackInfo{
+				ID:   "test-buildpack/sample",
+				Name: "sample",
+			},
+			Path: "../buildpack",
+		}
+
+		output := &bytes.Buffer{}
+
+		Expect(toml.NewEncoder(output).Encode(bp)).To(Succeed())
+		Expect(output.String()).NotTo(ContainSubstring("ath = ")) // match on path and Path
+	})
+}

init_test.go

@@ -33,5 +33,6 @@ func TestUnit(t *testing.T) {
 	suite("Main", testMain)
 	suite("Platform", testPlatform)
 	suite("ExecD", testExecD)
+	suite("BuildpackTOML", testBuildpackTOML)
 	suite.Run(t)
 }