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package invalid.lena.scrcpy;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertFalse;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
import java.io.File;
import java.nio.file.Files;
public class AtomicFilesTest {
@Rule
public TemporaryFolder dir = new TemporaryFolder();
@Test
public void writeCreatesFile() throws Exception {
File f = new File(dir.getRoot(), "x");
AtomicFiles.write(f, "hello".getBytes());
assertArrayEquals("hello".getBytes(), Files.readAllBytes(f.toPath()));
}
@Test
public void writeReplacesExistingWhole() throws Exception {
File f = new File(dir.getRoot(), "x");
AtomicFiles.write(f, "old".getBytes());
AtomicFiles.write(f, "new-and-longer".getBytes());
assertArrayEquals("new-and-longer".getBytes(), Files.readAllBytes(f.toPath()));
}
@Test
public void writeLeavesNoTempBehind() throws Exception {
File f = new File(dir.getRoot(), "x");
AtomicFiles.write(f, "data".getBytes());
assertFalse(new File(dir.getRoot(), "x.tmp").exists());
}
@Test
public void staleTempDoesNotCorruptDestination() throws Exception {
// A crash after staging but before the rename leaves a partial ".tmp".
// The destination must still hold the previous good content, and the
// next successful write must overwrite the stale temp cleanly.
File f = new File(dir.getRoot(), "x");
AtomicFiles.write(f, "good".getBytes());
Files.write(new File(dir.getRoot(), "x.tmp").toPath(), "partial".getBytes());
assertArrayEquals("good".getBytes(), Files.readAllBytes(f.toPath()));
AtomicFiles.write(f, "good2".getBytes());
assertArrayEquals("good2".getBytes(), Files.readAllBytes(f.toPath()));
assertFalse(new File(dir.getRoot(), "x.tmp").exists());
}
@Test
public void writeRemovesEveryStaleTemp() throws Exception {
File f = new File(dir.getRoot(), "x");
Files.write(new File(dir.getRoot(), "x.tmp-old").toPath(), new byte[]{1});
Files.write(new File(dir.getRoot(), "x.tmp-new").toPath(), new byte[]{2});
AtomicFiles.write(f, "good".getBytes());
assertFalse(new File(dir.getRoot(), "x.tmp-old").exists());
assertFalse(new File(dir.getRoot(), "x.tmp-new").exists());
}
}
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