Test file to reproduce IllegalStateException on TemporaryFolder.newFile(String)

TemporaryFolderTest.java

import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.*;

import java.io.File;
import java.io.IOException;

import org.junit.Test;
import org.junit.rules.TemporaryFolder;

public class TemporaryFolderTest {

  @Test
  public void canCreateTemporaryFileWithGivenName() throws IOException {
    TemporaryFolder tempFolder = new TemporaryFolder();

    File file = tempFolder.newFile("MyFile.txt");
    
    assertThat("File", file, is(notNullValue()));
    assertThat("File doesn't exist", file.exists(), is(true));
    assertThat("File name", file.getName(), is("MyFile.txt"));
  }
}