Jan 14, 2021 · Jan 14, 2021
diff --git a/src/test/java/ev3dev/utils/DataChannelRewriterTest.java b/src/test/java/ev3dev/utils/DataChannelRewriterTest.java
 package ev3dev.utils;

 import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;

 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;

 import static org.junit.Assert.assertEquals;

 /**
 * Some tests of DataChannelRewriter.
 *
 * @author David Walend
 */
 public class DataChannelRewriterTest {

    static Path tempDirectory;
    static Path testPath;
    static final String startString = "Original String";
    static final String differentString = "Written String";

    @BeforeClass
    public static void createFiles() throws IOException {
        tempDirectory = Files.createTempDirectory("DataChannelRewriterTest");
        testPath = Files.createFile(Path.of(tempDirectory.toString(),"testFile"));
        Files.write(testPath, startString.getBytes());
    }

    @Before
    public void writeFile() throws IOException {
        Files.write(testPath, startString.getBytes());
    }

    @AfterClass
    public static void cleanupFiles() throws IOException {
        Files.delete(testPath);
        Files.delete(tempDirectory);
    }


    @Test
    public void testOpenClose() throws IOException {
        DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32);
        rewriter.close();

        assertEquals(startString,Files.readString(testPath));
    }

    @Test
    public void testOpenReadClose() throws IOException {
        DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32);
        rewriter.writeString(differentString);
        rewriter.close();

        assertEquals(differentString+"\n",Files.readString(testPath));
    }

    @Test
    public void testClosable() throws IOException {
        try(DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32)){
            rewriter.writeString(differentString);
        }
        assertEquals(differentString+"\n",Files.readString(testPath));
    }

    @Test
    public void testOpenWriteTwoThingsClose() throws IOException {
        DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32);
        rewriter.writeString(differentString);
        assertEquals(differentString+"\n",Files.readString(testPath));

        String anotherString = "Another String";
        rewriter.writeString(anotherString);

        assertEquals(anotherString+"\n",Files.readString(testPath));

        rewriter.close();
    }

    @Test(expected = RuntimeException.class)
    public void testOpenNonexistentFile() throws IOException {
        Path badPath = Path.of("/does/not/exist");

        DataChannelRewriter rewriter = new DataChannelRewriter(badPath,32);
        rewriter.writeString(differentString);
        rewriter.close();
    }
 }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,92 @@
		package ev3dev.utils;

		import org.junit.AfterClass;
		import org.junit.Before;
		import org.junit.BeforeClass;
		import org.junit.Test;

		import java.io.IOException;
		import java.nio.file.Files;
		import java.nio.file.Path;

		import static org.junit.Assert.assertEquals;

		/**
		* Some tests of DataChannelRewriter.
		*
		* @author David Walend
		*/
		public class DataChannelRewriterTest {

		static Path tempDirectory;
		static Path testPath;
		static final String startString = "Original String";
		static final String differentString = "Written String";

		@BeforeClass
		public static void createFiles() throws IOException {
		tempDirectory = Files.createTempDirectory("DataChannelRewriterTest");
		testPath = Files.createFile(Path.of(tempDirectory.toString(),"testFile"));
		Files.write(testPath, startString.getBytes());
		}

		@Before
		public void writeFile() throws IOException {
		Files.write(testPath, startString.getBytes());
		}

		@AfterClass
		public static void cleanupFiles() throws IOException {
		Files.delete(testPath);
		Files.delete(tempDirectory);
		}


		@Test
		public void testOpenClose() throws IOException {
		DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32);
		rewriter.close();

		assertEquals(startString,Files.readString(testPath));
		}

		@Test
		public void testOpenReadClose() throws IOException {
		DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32);
		rewriter.writeString(differentString);
		rewriter.close();

		assertEquals(differentString+"\n",Files.readString(testPath));
		}

		@Test
		public void testClosable() throws IOException {
		try(DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32)){
		rewriter.writeString(differentString);
		}
		assertEquals(differentString+"\n",Files.readString(testPath));
		}

		@Test
		public void testOpenWriteTwoThingsClose() throws IOException {
		DataChannelRewriter rewriter = new DataChannelRewriter(testPath,32);
		rewriter.writeString(differentString);
		assertEquals(differentString+"\n",Files.readString(testPath));

		String anotherString = "Another String";
		rewriter.writeString(anotherString);

		assertEquals(anotherString+"\n",Files.readString(testPath));

		rewriter.close();
		}

		@Test(expected = RuntimeException.class)
		public void testOpenNonexistentFile() throws IOException {
		Path badPath = Path.of("/does/not/exist");

		DataChannelRewriter rewriter = new DataChannelRewriter(badPath,32);
		rewriter.writeString(differentString);
		rewriter.close();
		}
		}