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

core-java-modules/core-java-io-apis-2/src/test/java/com/baeldung/inputstream/InputStreamTest.java

@@ -0,0 +1,58 @@
+package com.baeldung.inputstream;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+public class InputStreamTest {
+
+    @Test
+    public void givenAString_whenWrittenToFileInputStream_thenShouldMatchWhenRead(@TempDir Path tempDir) throws IOException {
+
+        Path sampleOut = tempDir.resolve("sample-out.txt");
+        List<String> lines = Arrays.asList("Hello. This is just a test. Good bye.");
+        Files.write(sampleOut, lines);
+        File sampleOutFile = sampleOut.toFile();
+        try(InputStream inputStream = new FileInputStream(sampleOutFile)){
+            Assert.assertTrue(readString(inputStream).contains(lines.get(0)));
+        }
+    }
+
+    @Test
+    public void givenAString_whenWrittenToByteArrayInputStream_thenShouldMatchWhenRead() throws IOException {
+        byte[] byteArray = {104, 101, 108, 108,111};
+        try(ByteArrayInputStream bais = new ByteArrayInputStream(byteArray)){
+            int content;
+            StringBuilder actualReadText = new StringBuilder();
+            while ((content = bais.read()) != -1) {
+                actualReadText.append((char) content);
+            }
+            Assert.assertEquals( "hello",actualReadText.toString());
+        }
+
+    }
+
+    private static String readString(InputStream inputStream) throws IOException {
+        String strRet = "";
+        int c;
+        StringBuilder sb = new StringBuilder();
+        while(!((c = inputStream.read()) != -1)) {
+            sb.append((char) c);
+        }
+        strRet = sb.toString();
+
+        return  strRet;
+    }
+
+
+}

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

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+package com.baeldung.inputstreamreader;
+
+import java.io.BufferedReader;
+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.Assert;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+public class InputStreamReaderTest {
+
+    @Test
+    public void givenAStringWrittenToAFile_whenReadByInputStreamReader_thenShouldMatchWhenRead(@TempDir Path tempDir) throws IOException {
+        boolean isMatched = false;
+        String sampleTxt = "Good day. This is just a test. Good bye.";
+        Path sampleOut = tempDir.resolve("sample-out.txt");
+        List<String> lines = Arrays.asList(sampleTxt);
+        //create and write file
+        Files.write(sampleOut, lines);
+        try(FileInputStream fis = new FileInputStream(String.valueOf(sampleOut.toAbsolutePath()));
+            BufferedReader br = new BufferedReader(new InputStreamReader(fis, StandardCharsets.UTF_8));){
+            String ln;
+            while((ln = br.readLine())!= null){
+                if(ln.contains(sampleTxt)){
+                    isMatched = true;
+                    break;
+                }
+            }
+            Assert.assertTrue(isMatched);
+        }
+    }
+
+}