@Test
public void WriteStringKeepOpenTest() throws IOException {

    SimpleTextWriter sfw = new SimpleTextWriter
            .Builder(tmpFile)
            .keepOpen()
            .build();
    sfw.write("Hello");
    sfw.write("Merhaba");
    sfw.write("");
    sfw.write(null);
    IOs.closeSilently(sfw);
    Assert.assertEquals("HelloMerhaba", new SimpleTextReader(tmpFile).asString());
}