Reinstate Verify.java that was removed in 47c0c3c0

spring-boot-samples/spring-boot-sample-custom-layout/src/test/java/sample/layout/Verify.java

+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample.layout;
+
+import java.io.File;
+import java.util.Enumeration;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+public final class Verify {
+
+	private Verify() {
+	}
+
+	public static void verify(File file, String entry) throws Exception {
+		ZipFile zipFile = new ZipFile(file);
+		try {
+			Enumeration<? extends ZipEntry> entries = zipFile.entries();
+			while (entries.hasMoreElements()) {
+				if (entries.nextElement().getName().equals(entry)) {
+					return;
+				}
+			}
+			throw new AssertionError("No entry " + entry);
+		}
+		finally {
+			zipFile.close();
+		}
+	}
+
+}
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