Sample test showcasing a side effect introduced with IDEA JDK 11 inspection for Files.write* methods

Jdk11FileWriteTest.java

package tech.toparvion.analog.util.dev;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;

import static org.junit.jupiter.api.Assertions.assertEquals;

/**
 * @author Toparvion
 */
class Jdk11FileWriteTest {

  private static final String RECORD = "Из России with love ;)";
  private static final Charset CHARSET = StandardCharsets.UTF_8;

  @Test
  @DisplayName("A string written with Files.write method can be read back correctly with Files.readString.")
  void testFilesWriteMethod() throws IOException {
    Path testFilePath = Files.createTempFile("jdk11-files-write-test-", ".txt");
    System.out.println("Test file path for Files.write(): " + testFilePath);
    //noinspection ReadWriteStringCanBeUsed
    Files.write(testFilePath, RECORD.getBytes(CHARSET));

    String actual = Files.readString(testFilePath, CHARSET);
    assertEquals(RECORD, actual);
  }

  @Test
  @DisplayName("A string written with Files.writeString method can be read back correctly with Files.readString.")
  void testFilesWriteStringMethod() throws IOException {
    Path testFilePath = Files.createTempFile("jdk11-files-write-string-test-", ".txt");
    System.out.println("Test file path for Files.writeString(): " + testFilePath);
    Files.writeString(testFilePath, RECORD, CHARSET);

    String actual = Files.readString(testFilePath, CHARSET);
    assertEquals(RECORD, actual);
  }

  @AfterEach
  void tearDown() {
    // temp files are not removed deliberately in order to keep them for manual inspection
  }
}