Introduce StringUtils and Preconditions.notBlank(..)

junit-commons/src/main/java/org/junit/gen5/commons/util/ObjectUtils.java

@@ -23,10 +23,6 @@ private ObjectUtils() {
 		/* no-op */
 	}
 
-	public static boolean isEmpty(CharSequence charSequence) {
-		return (charSequence == null || charSequence.length() == 0);
-	}
-
 	public static String nullSafeToString(Class<?>... classes) {
 		if (classes == null || classes.length == 0) {
 			return "";

junit-commons/src/main/java/org/junit/gen5/commons/util/Preconditions.java

@@ -31,17 +31,31 @@ public static void notNull(Object object, Supplier<String> messageSupplier) {
 	}
 
 	/**
-	 * @see ObjectUtils#isEmpty(CharSequence)
+	 * @see StringUtils#isEmpty(CharSequence)
 	 */
 	public static void notEmpty(String str, String message) {
-		condition(!ObjectUtils.isEmpty(str), message);
+		condition(!StringUtils.isEmpty(str), message);
 	}
 
 	/**
-	 * @see ObjectUtils#isEmpty(CharSequence)
+	 * @see StringUtils#isEmpty(CharSequence)
 	 */
 	public static void notEmpty(String str, Supplier<String> messageSupplier) {
-		condition(!ObjectUtils.isEmpty(str), messageSupplier);
+		condition(!StringUtils.isEmpty(str), messageSupplier);
+	}
+
+	/**
+	 * @see StringUtils#isBlank(String)
+	 */
+	public static void notBlank(String str, String message) {
+		condition(!StringUtils.isBlank(str), message);
+	}
+
+	/**
+	 * @see StringUtils#isBlank(String)
+	 */
+	public static void notBlank(String str, Supplier<String> messageSupplier) {
+		condition(!StringUtils.isBlank(str), messageSupplier);
 	}
 
 	public static void condition(boolean predicate, String message) {

junit-commons/src/main/java/org/junit/gen5/commons/util/StringUtils.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2015 the original author or authors.
+ *
+ * All rights reserved. This program and the accompanying materials are
+ * made available under the terms of the Eclipse Public License v1.0 which
+ * accompanies this distribution and is available at
+ *
+ * http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.junit.gen5.commons.util;
+
+/**
+ * @author Sam Brannen
+ * @since 5.0
+ */
+public final class StringUtils {
+
+	private StringUtils() {
+		/* no-op */
+	}
+
+	public static boolean isEmpty(CharSequence charSequence) {
+		return (charSequence == null || charSequence.length() == 0);
+	}
+
+	public static boolean isBlank(String str) {
+		return (str == null || str.trim().length() == 0);
+	}
+
+}

junit5-api/src/main/java/org/junit/gen5/api/Assertions.java

@@ -14,7 +14,7 @@
 import java.util.function.BooleanSupplier;
 import java.util.function.Supplier;
 
-import org.junit.gen5.commons.util.ObjectUtils;
+import org.junit.gen5.commons.util.StringUtils;
 import org.opentestalliance.AssertionFailedError;
 import org.opentestalliance.MultipleFailuresException;
 
@@ -250,7 +250,7 @@ public static <T extends Throwable> T expectThrows(Class<T> expected, Executable
 
 	private static void failEqual(Object actual, String message) {
 		String prefix = "Values should be different. ";
-		if (!ObjectUtils.isEmpty(message)) {
+		if (!StringUtils.isEmpty(message)) {
 			prefix = message + ". ";
 		}
 		fail(prefix + "Actual: " + actual);
@@ -295,7 +295,7 @@ private static String formatClassAndValue(Object value, String valueString) {
 	}
 
 	private static String buildPrefix(String message) {
-		return (!ObjectUtils.isEmpty(message) ? message + " ==> " : "");
+		return (!StringUtils.isEmpty(message) ? message + " ==> " : "");
 	}
 
 	private static String nullSafeGet(Supplier<String> messageSupplier) {

junit5-engine/src/main/java/org/junit/gen5/engine/junit5/descriptor/MethodTestDescriptor.java

@@ -10,16 +10,16 @@
 
 package org.junit.gen5.engine.junit5.descriptor;
 
-import static org.junit.gen5.commons.util.ObjectUtils.nullSafeToString;
+import static org.junit.gen5.commons.util.ObjectUtils.*;
 
 import java.lang.reflect.Method;
 
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 
 import org.junit.gen5.api.Test;
-import org.junit.gen5.commons.util.ObjectUtils;
 import org.junit.gen5.commons.util.Preconditions;
+import org.junit.gen5.commons.util.StringUtils;
 import org.junit.gen5.engine.TestDescriptor;
 
 /**
@@ -51,7 +51,7 @@ private String determineDisplayName() {
 		Test test = testMethod.getAnnotation(Test.class);
 		if (test != null) {
 			String customName = test.name();
-			if (!ObjectUtils.isEmpty(customName)) {
+			if (!StringUtils.isBlank(customName)) {
 				return customName;
 			}
 		}