Merge pull request #15766 from adalagandev/BAEL-7131_InputStream_vs_InputStreamReader_in_Java_v2

BAEL-7131 version 1 - POST REPO re-writing the commit history issue.

core-java-modules/core-java-io-apis-2/pom.xml

@@ -96,4 +96,5 @@
     <properties>
         <junit-jupiter-version>5.9.3</junit-jupiter-version>
     </properties>
+
 </project>

core-java-modules/core-java-io-apis-2/src/test/java/com/baeldung/inputstreamreader/InputStreamReaderUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.inputstreamreader;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+public class InputStreamReaderUnitTest {
+    @Test
+    public void givenAStringWrittenToAFile_whenReadByInputStreamReader_thenShouldMatchWhenRead(@TempDir Path tempDir) throws IOException {
+        String sampleTxt = "Good day. This is just a test. Good bye.";
+        Path sampleOut = tempDir.resolve("sample-out.txt");
+        List<String> lines = Arrays.asList(sampleTxt);
+        Files.write(sampleOut, lines);
+        String absolutePath = String.valueOf(sampleOut.toAbsolutePath());
+        try (InputStreamReader reader = new InputStreamReader(new FileInputStream(absolutePath), StandardCharsets.UTF_8)) {
+            boolean isMatched = false;
+            int b;
+            StringBuilder sb = new StringBuilder();
+            while ((b = reader.read()) != -1) {
+                sb.append((char) b);
+                if (sb.toString().contains(sampleTxt)) {
+                    isMatched = true;
+                    break;
+                }
+            }
+            assertThat(isMatched).isTrue();
+        }
+    }
+}