@Test(expected = EOFException.class)
public void testReadFully_throws_exception_if_not_enough_data() throws IOException {
InputStream inputStream = new ByteArrayInputStream(new byte[0]);
DataIO.readFully(inputStream, new byte[1]);
fail(
"An EOFException should have occurred by now since there are not enough bytes to read from the InputStream");
}
@Test
public void testReadFully_with_data_length_same_as_buffer_length() throws IOException {
byte[] inputBuffer = new byte[] {1, 2, 3, 4};
InputStream in = new ByteArrayInputStream(inputBuffer);
byte[] outputBuffer = new byte[4];
DataIO.readFully(in, outputBuffer);
assertArrayEquals(
"The passed buffer should be filled with the whole content of the InputStream"
+ " since the buffer length is exactly same as the data length",
inputBuffer,
outputBuffer);
}
@Test
public void testReadFully_with_too_much_data() throws IOException {
byte[] inputBuffer = new byte[] {1, 2, 3, 4};
InputStream in = new ByteArrayInputStream(inputBuffer);
byte[] outputBuffer = new byte[3];
DataIO.readFully(in, outputBuffer);
byte[] expected = new byte[] {1, 2, 3};
assertArrayEquals(
"The passed buffer should be filled with the first three bytes read from the InputStream",
expected,
outputBuffer);
}