Merge pull request #7752 from nikunjgandhi1987/master

BAEL-3214 | FileWriter class

core-java-modules/core-java-io-2/src/test/java/com/baeldung/filewriter/FileWriterExampleUnitTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.filewriter;
+
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class FileWriterExampleUnitTest {
+
+    @After
+    public void tearDown() throws IOException {
+        Files.delete(Path.of("src/test/resources/FileWriterTest.txt"));
+    }
+
+    @Test
+    public void testWriteString() throws IOException {
+        try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt")) {
+            fileWriter.write("Hello Folks!");
+        }
+        Assert.assertEquals("Hello Folks!", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
+    }
+
+    @Test
+    public void testAppendString() throws IOException {
+        try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt")) {
+            fileWriter.write("Hello Folks!");
+        }
+        // using another try with resources to reopen the file in append mode
+        try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt", true)) {
+            fileWriter.write("Hello Folks Again!");
+        }
+
+        Assert.assertEquals("Hello Folks!" + "Hello Folks Again!", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
+    }
+
+    @Test
+    public void testWriteCharArray() throws IOException {
+        try (FileWriter fileWriter = new FileWriter("src/test/resources/FileWriterTest.txt")) {
+            fileWriter.write("Hello Folks!".toCharArray());
+        }
+        Assert.assertEquals("Hello Folks!", new String(Files.readAllBytes(Path.of("src/test/resources/FileWriterTest.txt"))));
+    }
+}