fix/workaround memory leaks

Author: sokra

test/TestCases.template.js

@@ -187,8 +187,12 @@ const describeCases = config => {
 								})
 							};
 							beforeAll(done => {
+								FileCachePlugin.purgeMemoryCache();
 								rimraf(cacheDirectory, done);
 							});
+							afterAll(() => {
+								FileCachePlugin.purgeMemoryCache();
+							});
 							if (config.cache) {
 								it(testName + " should pre-compile", done => {
 									FileCachePlugin.purgeMemoryCache();

test/setupTestFramework.js

@@ -50,3 +50,8 @@ if (process.env.ALTERNATIVE_SORT) {
 		return this;
 	};
 }
+
+// Workaround for a memory leak in wabt
+// It leaks an Error object on construction
+// so it leaks the whole stack trace
+require("wast-loader");