Add JiraCsv294Test

src/test/java/org/apache/commons/csv/issues/JiraCsv294Test.java

@@ -0,0 +1,78 @@
+/*
+ * 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.commons.csv.issues;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+
+import org.apache.commons.csv.CSVFormat;
+import org.apache.commons.csv.CSVParser;
+import org.apache.commons.csv.CSVPrinter;
+import org.apache.commons.csv.CSVRecord;
+import org.junit.jupiter.api.Test;
+
+public class JiraCsv294Test {
+
+    private static void testInternal(final CSVFormat csvFormat, final String expectedSubstring) throws IOException {
+        final ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        try (CSVPrinter printer = new CSVPrinter(new OutputStreamWriter(bos, StandardCharsets.UTF_8), csvFormat)) {
+            printer.printRecord("a", "b \"\"", "c");
+        }
+        final byte[] written = bos.toByteArray();
+        final String writtenString = new String(written, StandardCharsets.UTF_8);
+        assertTrue(writtenString.contains(expectedSubstring));
+        try (CSVParser parser = new CSVParser(new InputStreamReader(new ByteArrayInputStream(written), StandardCharsets.UTF_8), csvFormat)) {
+            final List<CSVRecord> records = parser.getRecords();
+            assertEquals(1, records.size());
+            final CSVRecord record = records.get(0);
+            assertEquals("a", record.get(0));
+            assertEquals("b \"\"", record.get(1));
+            assertEquals("c", record.get(2));
+        }
+    }
+
+    @Test
+    public void testDefaultCsvFormatWithBackslashEscapeWorks() throws IOException {
+        testInternal(CSVFormat.Builder.create().setEscape('\\').build(), ",\"b \\\"\\\"\",");
+    }
+
+    @Test
+    public void testDefaultCsvFormatWithNullEscapeWorks() throws IOException {
+        testInternal(CSVFormat.Builder.create().setEscape(null).build(), ",\"b \"\"\"\"\",");
+    }
+
+    @Test
+    public void testDefaultCsvFormatWithQuoteEscapeWorks() throws IOException {
+        // this one doesn't actually work but should behave like setEscape(null)
+        // Printer is writing the expected content but Parser is unable to consume it
+        testInternal(CSVFormat.Builder.create().setEscape('"').build(), ",\"b \"\"\"\"\",");
+    }
+
+    @Test
+    public void testDefaultCsvFormatWorks() throws IOException {
+        testInternal(CSVFormat.Builder.create().build(), ",\"b \"\"\"\"\",");
+    }
+}