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test/org/apache/tomcat/util/buf/TestStringUtils.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.tomcat.util.buf;
+
+import java.util.Collection;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/*
+ * None of these tests should throw a NPE.
+ */
+public class TestStringUtils {
+
+    @Test
+    public void testNullArray() {
+        Assert.assertEquals("", StringUtils.join((String[]) null));
+    }
+
+
+    @Test
+    public void testNullArrayCharStringBuilder() {
+        StringBuilder sb = new StringBuilder();
+        StringUtils.join((String[]) null, ',', sb);
+        Assert.assertEquals("", sb.toString());
+    }
+
+
+    @Test
+    public void testNullCollection() {
+        Assert.assertEquals("", StringUtils.join((Collection<String>) null));
+    }
+
+
+    @Test
+    public void testNullCollectionChar() {
+        Assert.assertEquals("", StringUtils.join(null, ','));
+    }
+
+
+    @Test
+    public void testNullIterableCharStringBuilder() {
+        StringBuilder sb = new StringBuilder();
+        StringUtils.join((Iterable<String>) null, ',', sb);
+        Assert.assertEquals("", sb.toString());
+    }
+
+
+    @Test
+    public void testNullArrayCharFunctionStringBuilder() {
+        StringBuilder sb = new StringBuilder();
+        StringUtils.join((String[]) null, ',', null, sb);
+        Assert.assertEquals("", sb.toString());
+    }
+
+
+    @Test
+    public void testNullIterableCharFunctionStringBuilder() {
+        StringBuilder sb = new StringBuilder();
+        StringUtils.join((Iterable<String>) null, ',', null, sb);
+        Assert.assertEquals("", sb.toString());
+    }
+}