Java: add test for partial gradle wrapper without gradle on the path

Note I had to mimic the actual absence of Gradle by testing the case where it fails, but have manually verified a missing binary works too.

Author: smowton

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/.gitattributes

@@ -0,0 +1,6 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# These are explicitly windows files and should use crlf
+*.bat           text eol=crlf
+

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/.gitignore

@@ -0,0 +1,5 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/build.gradle

@@ -0,0 +1,30 @@
+/*
+ * This build file was auto generated by running the Gradle 'init' task
+ * by 'arthur' at '28/11/20 22:29' with Gradle 3.0
+ *
+ * This generated file contains a sample Java project to get you started.
+ * For more details take a look at the Java Quickstart chapter in the Gradle
+ * user guide available at https://docs.gradle.org/3.0/userguide/tutorial_java_projects.html
+ */
+
+// Apply the java plugin to add support for Java
+apply plugin: 'java'
+
+// In this section you declare where to find the dependencies of your project
+repositories {
+    // Use 'jcenter' for resolving your dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    jcenter()
+}
+
+// In this section you declare the dependencies for your production and test code
+dependencies {
+    // The production code uses the SLF4J logging API at compile time
+    compile 'org.slf4j:slf4j-api:1.7.21'
+
+    // Declare the dependency for your favourite test framework you want to use in your tests.
+    // TestNG is also supported by the Gradle Test task. Just change the
+    // testCompile dependency to testCompile 'org.testng:testng:6.8.1' and add
+    // 'test.useTestNG()' to your build script.
+    testCompile 'junit:junit:4.12'
+}

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/force_sequential_test_execution

@@ -0,0 +1,3 @@
+# We currently have a bug where gradle tests become flaky when executed in parallel
+# - sometimes, gradle fails to connect to the gradle daemon.
+# Therefore, force this test to run sequentially.

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/gradle/verification-metadata.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<verification-metadata>
+    <configuration>
+        <verify-metadata>true</verify-metadata>
+        <verify-signatures>false</verify-signatures>
+    </configuration>
+</verification-metadata>

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/gradlew

@@ -0,0 +1,19 @@
+/*
+ * This settings file was auto generated by the Gradle buildInit task
+ * by 'arthur' at '28/11/20 22:29' with Gradle 3.0
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * In a single project build this file can be empty or even removed.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user guide at https://docs.gradle.org/3.0/userguide/multi_project_builds.html
+ */
+
+/*
+// To declare projects as part of a multi-project build use the 'include' method
+include 'shared'
+include 'api'
+include 'services:webservice'
+*/
+
+rootProject.name = 'gradle-sample'

java/ql/integration-tests/all-platforms/java/partial-gradle-sample-without-gradle/gradlew.bat

@@ -0,0 +1,14 @@
+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package com.example;
+
+public class App {
+    public String getGreeting() {
+        return "Hello world.";
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new App().getGreeting());
+    }
+}