Add a "testutils" module and move common test code there

buildSrc/src/main/groovy/rhino.java-conventions.gradle

@@ -1,3 +1,7 @@
+// This file contains Gradle "conventions" that we use in all of our projects.
+// It is the appropriate set of conventions to use for modules that will not be
+// published, such as test modules.
+
 plugins {
     id 'java-library'
     id 'com.diffplug.spotless'

buildSrc/src/main/groovy/rhino.library-conventions.gradle

@@ -1,3 +1,8 @@
+// This file inherits from "java-conventions" and adds additional error
+// checks and publishing data for modules that will be published to
+// Maven Central. It should only be used for those modules that will
+// be published and used by other projects.
+
 plugins {
     id 'rhino.java-conventions'
     id 'maven-publish'

rhino/build.gradle

@@ -2,6 +2,9 @@ plugins {
     id 'rhino.library-conventions'
 }
 
+dependencies {
+    testImplementation project(':testutils')
+}
 
 publishing {
     publications {

settings.gradle

@@ -1,2 +1,2 @@
 rootProject.name = 'rhino-root'
-include 'rhino', 'rhino-engine', 'rhino-tools', 'rhino-xml', 'rhino-all', 'examples', 'tests', 'benchmarks'
+include 'rhino', 'rhino-engine', 'rhino-tools', 'rhino-xml', 'rhino-all', 'examples', 'testutils', 'tests', 'benchmarks'

tests/build.gradle

@@ -11,6 +11,7 @@ dependencies {
     implementation project(':rhino-tools')
     implementation project(':rhino-xml')
 
+    testImplementation project(':testutils')
     testImplementation("com.tngtech.archunit:archunit-junit4:1.3.0") {
         exclude group: 'junit'
     }

testutils/build.gradle

@@ -0,0 +1,12 @@
+// This module contains library code used by the tests in multiple other modules.
+
+plugins {
+    id 'rhino.java-conventions'
+}
+
+dependencies {
+    implementation project(':rhino')
+    // We need this to be an "implementation" dependency because, in order to be shared
+    // with tests in other projects, code in here must be in "main".
+    implementation "junit:junit:4.13.2"
+}

tests/src/test/java/org/mozilla/javascript/tests/Utils.java → testutils/src/main/java/org/mozilla/javascript/tests/Utils.java

@@ -25,6 +25,20 @@ public class Utils {
     /** The default set of levels to run tests at. */
     public static final int[] DEFAULT_OPT_LEVELS = new int[] {-1, 9};
 
+    /**
+     * Execute the provided script in a fresh context as "myScript.js".
+     *
+     * @param script the script code
+     */
+    static void executeScript(String script, boolean interpreted) {
+        Utils.runWithMode(
+                cx -> {
+                    final Scriptable scope = cx.initStandardObjects();
+                    return cx.evaluateString(scope, script, "myScript.js", 1, null);
+                },
+                interpreted);
+    }
+
     /** Runs the action successively with all available optimization levels */
     public static void runWithAllOptimizationLevels(final ContextAction<?> action) {
         runWithMode(action, false);
@@ -50,6 +64,7 @@ public static void runWithMode(final ContextAction<?> action, final boolean inte
     }
 
     /** Runs the provided action at the given optimization level */
+    @SuppressWarnings("deprecation")
     public static void runWithOptimizationLevel(
             final ContextFactory contextFactory,
             final ContextAction<?> action,