package httpserver;

import httpserver.file.FileOperator;

import org.junit.Test;

import java.io.IOException;

import java.io.PrintStream;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.nio.file.StandardOpenOption;

import static httpserver.file.FileHelpers.tempDir;

import static java.nio.file.Files.readAllBytes;

import static java.nio.file.Files.write;

import static java.nio.file.Files.exists;

import static org.junit.Assert.*;

import static org.mockito.Mockito.*;

public class LoggerTest {

private final Path logPath;

private final Logger logger;

private final PrintStream printStreamMock;

private final FileOperator fileOperatorMock;

public LoggerTest() throws IOException {

logPath = Paths.get(tempDir().toString(), "logs");

printStreamMock = mock(PrintStream.class);

logger = new Logger(logPath, new FileOperator(), printStreamMock);

fileOperatorMock = mock(FileOperator.class);

}

@Test

public void createsLogFileOnConstructDoesntOverwrite() throws Exception {

assertTrue(exists(logPath));

write(logPath, "fake log line\r\n".getBytes(),

StandardOpenOption.APPEND);

assertEquals("fake log line\r\n", new String(readAllBytes(logPath)));

}

@Test

public void writesToLogAndReadsFromLog() throws Exception {

logger.log("POST example");

logger.log("HEAD example");

String log = new String(logger.readLog());

assertEquals("POST example\r\nHEAD example\r\n", log);

}

@Test

public void printsErrorToStdErrIfCantWriteToLog() throws Exception {

doThrow(new IOException()).when(fileOperatorMock).appendToFile(any(), any());

Logger logger = new Logger(logPath, fileOperatorMock, printStreamMock);

logger.log("");

verify(printStreamMock).print(any(Exception.class));

}

}