Add configuration-cache test for PackageJsonExtension

Author: deepy

src/main/kotlin/com/github/gradle/node/PackageJsonExtension.kt

@@ -6,8 +6,14 @@ import org.gradle.api.Project
 import org.gradle.kotlin.dsl.property
 import org.gradle.util.GradleVersion
 
-
+/**
+ * Provides a parsed view of package.json
+ */
 open class PackageJsonExtension(project: Project) {
+
+    /**
+     * Raw JsonNode returned by Jackson, this may be removed in a future release
+     */
     val node = project.objects.property<JsonNode>()
 
     init {
@@ -29,14 +35,25 @@ open class PackageJsonExtension(project: Project) {
 
     val private = project.provider { node.get().get("private").asBoolean() }
 
+    /**
+     * Get the text value of a given field
+     */
     fun get(name: String): String {
         return node.get().get(name).asText()
     }
 
+    /**
+     * Get the boolean value of a given field
+     */
     fun getBoolean(name: String): Boolean {
         return node.get().get(name).asBoolean()
     }
 
+    /**
+     * Get the text value of a field containing nested objects
+     *
+     * e.g. <pre>{ "outer": { "inner": "nested } }</pre>
+     */
     fun get(vararg name: String): String {
         return name.fold(node.get()) { acc, next -> acc.get(next) }.asText()
     }

src/test/groovy/com/github/gradle/node/PackageJsonExtension_integTest.groovy

@@ -0,0 +1,34 @@
+package com.github.gradle.node
+
+import com.github.gradle.AbstractIntegTest
+import com.github.gradle.RunWithMultipleGradleVersions
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.Assume
+
+@RunWithMultipleGradleVersions
+class PackageJsonExtension_integTest extends AbstractIntegTest {
+
+    def 'check standard attribute'() {
+        given:
+        Assume.assumeTrue(isConfigurationCacheEnabled())
+        copyResources("fixtures/npm-env/")
+        copyResources("fixtures/env/")
+        createFile("build.gradle") << """
+def nameProvider = project.extensions.getByName("${PackageJsonExtension.NAME}").name
+tasks.register('printPackageJsonName') {
+    inputs.property('name', nameProvider)
+    doLast {
+        println nameProvider.get()
+    }
+}
+"""
+
+        when:
+        def result1 = build(":printPackageJsonName")
+        def result2 = build(":printPackageJsonName")
+
+        then:
+        result1.task(":printPackageJsonName").outcome == TaskOutcome.SUCCESS
+        result2.task(":printPackageJsonName").outcome == TaskOutcome.SUCCESS
+    }
+}