BAEL-1105: Apache Commons CSV, Test cases

libraries/pom.xml

@@ -212,6 +212,11 @@
 			<artifactId>commons-chain</artifactId>
 			<version>${commons-chain.version}</version>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-csv</artifactId>
+			<version>${commons-csv.version}</version>
+		</dependency>
 		<dependency>
 			<groupId>commons-dbutils</groupId>
 			<artifactId>commons-dbutils</artifactId>
@@ -480,6 +485,7 @@
 		<commons-text.version>1.1</commons-text.version>
 		<commons-beanutils.version>1.9.3</commons-beanutils.version>
 		<commons-chain.version>1.2</commons-chain.version>
+		<commons-csv.version>1.4</commons-csv.version>
 		<jasypt.version>1.9.2</jasypt.version>
 		<javatuples.version>1.2</javatuples.version>
 		<javaassist.version>3.21.0-GA</javaassist.version>
@@ -515,4 +521,4 @@
 		<rome.version>1.0</rome.version>
     <eclipse-collections.version>8.2.0</eclipse-collections.version>
 	</properties>
-</project>
+</project>

libraries/src/test/java/com/baeldung/commons/csv/CSVReaderWriterTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.commons.csv;
+
+import org.apache.commons.csv.CSVFormat;
+import org.apache.commons.csv.CSVPrinter;
+import org.apache.commons.csv.CSVRecord;
+import org.junit.Test;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringWriter;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+
+public class CSVReaderWriterTest {
+
+    public static final Map<String, String> AUTHOR_BOOK_MAP = Collections.unmodifiableMap(new LinkedHashMap<String, String>() {
+        {
+            put("Dan Simmons", "Hyperion");
+            put("Douglas Adams", "The Hitchhiker's Guide to the Galaxy");
+        }
+    });
+    public static final String[] HEADERS = { "author", "title" };
+    public static final String EXPECTED_FILESTREAM = "author,title\r\n" + "Dan Simmons,Hyperion\r\n" + "Douglas Adams,The Hitchhiker's Guide to the Galaxy";
+
+    @Test
+    public void givenCSVFile_whenRead_thenContentsAsExpected() throws IOException {
+        Reader in = new FileReader("src/test/resources/book.csv");
+        Iterable<CSVRecord> records = CSVFormat.DEFAULT
+          .withHeader(HEADERS)
+          .withFirstRecordAsHeader()
+          .parse(in);
+        for (CSVRecord record : records) {
+            String author = record.get("author");
+            String title = record.get("title");
+            assertEquals(AUTHOR_BOOK_MAP.get(author), title);
+        }
+    }
+
+    @Test
+    public void givenAuthorBookMap_whenProcessed_thenFileCreatedAsExpected() throws IOException {
+        StringWriter sw = new StringWriter();
+        try (final CSVPrinter printer = new CSVPrinter(sw, CSVFormat.DEFAULT.withHeader(HEADERS))) {
+            AUTHOR_BOOK_MAP.forEach((author, title) -> {
+                try {
+                    printer.printRecord(author, title);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            });
+        }
+        assertEquals(EXPECTED_FILESTREAM, sw
+          .toString()
+          .trim());
+    }
+
+}

libraries/src/test/resources/book.csv

@@ -0,0 +1,3 @@
+author,title
+Dan Simmons,Hyperion
+Douglas Adams,The Hitchhiker's Guide to the Galaxy