package buffers_test import ( "github.com/reiver/go-buffers" "reflect" "testing" ) func TestWriterSingleWrite(t *testing.T) { tests := []struct { BufferLength int Src []byte Expected []byte }{ { BufferLength: 0, Src: []byte("apple"), Expected: []byte{}, }, { BufferLength: 1, Src: []byte("apple"), Expected: []byte{}, }, { BufferLength: 2, Src: []byte("apple"), Expected: []byte{}, }, { BufferLength: 3, Src: []byte("apple"), Expected: []byte{}, }, { BufferLength: 4, Src: []byte("apple"), Expected: []byte{}, }, { BufferLength: 5, Src: []byte("apple"), Expected: []byte("apple"), }, { BufferLength: 6, Src: []byte("apple"), Expected: []byte("apple"), }, { BufferLength: 7, Src: []byte("apple"), Expected: []byte("apple"), }, { BufferLength: 8, Src: []byte("apple"), Expected: []byte("apple"), }, { BufferLength: 9, Src: []byte("apple"), Expected: []byte("apple"), }, { BufferLength: 10, Src: []byte("apple"), Expected: []byte("apple"), }, { BufferLength: 0, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 1, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 2, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 3, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 4, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 5, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 6, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 7, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 8, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 9, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 10, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 11, Src: []byte("apple BANANA"), Expected: []byte{}, }, { BufferLength: 12, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 13, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 14, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 15, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 16, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 17, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 18, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 19, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 20, Src: []byte("apple BANANA"), Expected: []byte("apple BANANA"), }, { BufferLength: 0, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 1, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 2, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 3, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 4, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 5, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 6, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 7, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 8, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 9, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 10, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 11, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 12, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 13, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 14, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 15, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 16, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 17, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 18, Src: []byte("apple BANANA Cherry"), Expected: []byte{}, }, { BufferLength: 19, Src: []byte("apple BANANA Cherry"), Expected: []byte("apple BANANA Cherry"), }, { BufferLength: 20, Src: []byte("apple BANANA Cherry"), Expected: []byte("apple BANANA Cherry"), }, } for testNumber, test := range tests { var buffer []byte = make([]byte, test.BufferLength) var dst buffers.Writer = buffers.NewWriter(buffer) n, err := dst.Write(test.Src) if _, casted := err.(buffers.TooShort); !casted { if nil != err { t.Errorf("For test #%d, did not expect an error, but actually got one.", testNumber) t.Logf("SRC: %q", test.Src) t.Logf("DST: %q (full)", buffer) t.Logf("DST EXPECTED: %q", test.Expected) t.Logf("ERROR TYPE: %T", err) t.Logf("ERROR: %q", err) continue } } var expectedWritten int { lenBuffer := len(buffer) lenSrc := len(test.Src) if lenBuffer < lenSrc { expectedWritten = lenBuffer } else { expectedWritten = lenSrc } if _, casted := err.(buffers.TooShort); casted { expectedWritten = 0 } } if expected, actual := expectedWritten, n; expected != actual { t.Errorf("For test #%d, the actual number of bytes written was not what was expected.", testNumber) t.Logf("SRC: %q", test.Src) t.Logf("DST: %q (full)", buffer) t.Logf("DST: %q", buffer[n:]) t.Logf("DST EXPECTED: %q", test.Expected) t.Logf("EXPECTED: %d", expected) t.Logf("ACTUAL: %d", actual) continue } if expected, actual := test.Expected, buffer[:n]; !reflect.DeepEqual(expected, actual) { t.Errorf("For test #%d, what was written is not what was expected.", testNumber) t.Logf("SRC: %q", test.Src) t.Logf("DST: %q (full)", buffer) t.Logf("DST: %q", buffer[n:]) t.Logf("DST EXPECTED: %q", test.Expected) t.Logf("EXPECTED: %q", expected,) t.Logf("ACTUAL: %q", actual) continue } } } func TestWriterMultipleWrites(t *testing.T) { tests := []struct { BufferLength int Srces [][]byte Expected []byte }{ { BufferLength: 0, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte{}, }, { BufferLength: 1, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("a"), }, { BufferLength: 2, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("ap"), }, { BufferLength: 3, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("app"), }, { BufferLength: 4, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("appl"), }, { BufferLength: 5, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("apple"), }, { BufferLength: 6, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("apple"), }, { BufferLength: 7, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("apple"), }, { BufferLength: 8, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("apple"), }, { BufferLength: 9, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("apple"), }, { BufferLength: 10, Srces: [][]byte{ []byte("a"), []byte("p"), []byte("p"), []byte("l"), []byte("e"), }, Expected: []byte("apple"), }, { BufferLength: 0, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte{}, }, { BufferLength: 1, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte{}, }, { BufferLength: 2, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BA"), }, { BufferLength: 3, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BA"), }, { BufferLength: 4, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BANA"), }, { BufferLength: 5, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BANAN"), }, { BufferLength: 6, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BANANA"), }, { BufferLength: 7, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BANANA"), }, { BufferLength: 8, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BANANA"), }, { BufferLength: 9, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BANANA"), }, { BufferLength: 10, Srces: [][]byte{ []byte("BA"), []byte("NA"), []byte("N"), []byte("A"), }, Expected: []byte("BANANA"), }, { BufferLength: 0, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte{}, }, { BufferLength: 1, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte{}, }, { BufferLength: 2, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte{}, }, { BufferLength: 3, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte{}, }, { BufferLength: 4, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte{}, }, { BufferLength: 5, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte{}, }, { BufferLength: 6, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple "), }, { BufferLength: 7, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple "), }, { BufferLength: 8, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple "), }, { BufferLength: 9, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple "), }, { BufferLength: 10, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple "), }, { BufferLength: 11, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple "), }, { BufferLength: 12, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA"), }, { BufferLength: 13, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA "), }, { BufferLength: 14, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA "), }, { BufferLength: 15, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA "), }, { BufferLength: 16, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA "), }, { BufferLength: 17, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA "), }, { BufferLength: 18, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA "), }, { BufferLength: 19, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA Cherry"), }, { BufferLength: 20, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA Cherry"), }, { BufferLength: 21, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA Cherry"), }, { BufferLength: 22, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA Cherry"), }, { BufferLength: 23, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA Cherry"), }, { BufferLength: 24, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA Cherry"), }, { BufferLength: 25, Srces: [][]byte{ []byte("apple "), []byte("BANANA"), []byte(" "), []byte("Cherry"), }, Expected: []byte("apple BANANA Cherry"), }, } TestLoop: for testNumber, test := range tests { var buffer []byte = make([]byte, test.BufferLength) var dst buffers.Writer = buffers.NewWriter(buffer) var sum int InnerLoop: for srcNumber, src := range test.Srces { n, err := dst.Write(src) if _, casted := err.(buffers.TooShort); casted { break InnerLoop } if nil != err { t.Errorf("For test #%d and src #%d, did not expect an error, but actually got one.", testNumber, srcNumber) t.Logf("BUFFER LENGTH: %d", test.BufferLength) for i, s := range test.Srces { t.Logf("SRC[%d]: %q", i, s) } t.Logf("SRC: %q", src) t.Logf("DST: %q (full)", buffer) t.Logf("DST EXPECTED: %q", test.Expected) t.Logf("ERROR TYPE: %T", err) t.Logf("ERROR: %q", err) continue TestLoop } var expectedWritten int { lenBuffer := len(buffer) lenSrc := len(src) if lenBuffer-sum < lenSrc { expectedWritten = lenBuffer-sum } else { expectedWritten = lenSrc } } if expected, actual := expectedWritten, n; expected != actual { t.Errorf("For test #%d and src #%d, the actual number of bytes written was not what was expected.", testNumber, srcNumber) t.Logf("BUFFER LENGTH: %d", test.BufferLength) for i, s := range test.Srces { t.Logf("SRC[%d]: %q", i, s) } t.Logf("SRC: %q", src) t.Logf("DST: %q (full)", buffer) t.Logf("DST: %q", buffer[n:]) t.Logf("DST EXPECTED: %q", test.Expected) t.Logf("EXPECTED: %d", expected) t.Logf("ACTUAL: %d", actual) continue TestLoop } sum += n } if expected, actual := test.Expected, buffer[:sum]; !reflect.DeepEqual(expected, actual) { t.Errorf("For test #%d, what was written is not what was expected.", testNumber) t.Logf("BUFFER LENGTH: %d", test.BufferLength) for i, s := range test.Srces { t.Logf("SRC[%d]: %q", i, s) } t.Logf("DST: %q (full)", buffer) t.Logf("DST: %q", buffer[sum:]) t.Logf("DST EXPECTED: %q", test.Expected) t.Logf("EXPECTED: %q", expected,) t.Logf("ACTUAL: %q", actual) continue TestLoop } } }