feat: add basic integration test

src/test/groovy/io/github/themrmilchmann/gradle/ecj/plugins/ECJPluginTest.groovy

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2022 Leon Linhart
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package io.github.themrmilchmann.gradle.ecj.plugins
+
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import spock.lang.Specification
+import spock.lang.TempDir
+import spock.lang.Unroll
+
+class ECJPluginTest extends Specification {
+
+    private static def GRADLE_VERSIONS = [
+        "7.4.2"
+    ]
+
+    @TempDir
+    File projectDir
+    File buildFile
+    File settingsFile
+
+    def setup() {
+        buildFile = new File(projectDir, "build.gradle")
+        settingsFile = new File(projectDir, "settings.gradle")
+    }
+
+    @Unroll
+    def "run without explicit toolchain (Gradle #gradleVersion)"() {
+        given:
+        writeHelloWorld()
+        buildFile << """\
+            plugins {
+                id 'java-library'
+                id 'io.github.themrmilchmann.ecj'
+            }
+
+            repositories {
+                mavenCentral()
+            }
+        """.stripIndent()
+
+        when:
+        def result = runGradle("7.4.2", "build", "--info")
+
+        then:
+        new File(projectDir, "build/classes/java/main/com/example/Main.class").isFile()
+        result.task(":compileJava").outcome == TaskOutcome.SUCCESS
+
+        where:
+        gradleVersion << GRADLE_VERSIONS
+    }
+
+    private runGradle(String version, String... args) {
+        def arguments = []
+        arguments.addAll(args)
+        arguments.add("-s")
+
+        GradleRunner.create()
+            .withGradleVersion(version)
+            .withProjectDir(projectDir)
+            .withArguments(arguments)
+            .withPluginClasspath()
+            .build()
+    }
+
+    private void writeHelloWorld(File baseDir = projectDir) {
+        File outputFile = new File(baseDir, "src/main/java/com/example/Main.java")
+        outputFile.parentFile.mkdirs()
+        outputFile.createNewFile()
+
+        outputFile << """\
+            package com.example;
+
+            public class Main {
+
+                public static void main(String[] args) {
+                    System.out.println("Hello World!");
+                }
+
+            }
+            """.stripIndent()
+    }
+
+    protected File createFile(String path, File baseDir = projectDir) {
+        File file = new File(baseDir, path)
+        if (!file.exists()) {
+            assert file.parentFile.mkdirs() || file.parentFile.exists()
+            file.createNewFile()
+        }
+        return file
+    }
+
+}