bufferview/tests/index.js

A DataView for node Buffers.

var BufferView = require("..");
var tape = require("tape");

tape("inheritance", function(test) {
    test.ok(new BufferView(new Buffer(1)) instanceof DataView);
    test.end();
});

tape("create", function(test) {
    var b = new Buffer(1),
        ab = new ArrayBuffer(1),
        t;
    test.ok((t = BufferView.create(b)) instanceof BufferView);
    test.ok(t instanceof DataView);
    test.notOk((t = BufferView.create(ab)) instanceof BufferView);
    test.ok(t instanceof DataView);
    test.end();
});

tape("u-/int8", function(test) {
    var b = new Buffer(1),
        bv = new BufferView(b);
    bv.setUint8(0, 0xFE);
    test.strictEqual(bv.getUint8(0), 0xFE);
    test.strictEqual(bv.getInt8(0), -2);
    bv.setInt8(0, 0xFE);
    test.strictEqual(bv.getUint8(0), 0xFE);
    test.strictEqual(bv.getInt8(0), -2);
    bv.setInt8(0, -2);
    test.strictEqual(bv.getInt8(0), -2);
    test.strictEqual(bv.getUint8(0), 0xFE);
    bv.setUint8(0, -2);
    test.strictEqual(bv.getInt8(0), -2);
    test.strictEqual(bv.getUint8(0), 0xFE);
    test.end();
});

tape("u-/int16", function(test) {
    var b = new Buffer(2),
        bv = new BufferView(b);
    [false, true].forEach(function(le) {
        bv.setUint16(0, 0xFFFE, le);
        test.strictEqual(bv.getUint16(0, le), 0xFFFE);
        test.strictEqual(bv.getInt16(0, le), -2);
        bv.setInt16(0, 0xFFFE, le);
        test.strictEqual(bv.getUint16(0, le), 0xFFFE);
        test.strictEqual(bv.getInt16(0, le), -2);
        bv.setInt16(0, -2, le);
        test.strictEqual(bv.getInt16(0, le), -2);
        test.strictEqual(bv.getUint16(0, le), 0xFFFE);
        bv.setUint16(0, -2, le);
        test.strictEqual(bv.getInt16(0, le), -2);
        test.strictEqual(bv.getUint16(0, le), 0xFFFE);
        le ? test.strictEqual(b.toString("hex"), "feff") : test.strictEqual(b.toString("hex"), "fffe");
    });
    test.end();
});

tape("u-/int32", function(test) {
    var b = new Buffer(4),
        bv = new BufferView(b);
    [false, true].forEach(function(le) {
        bv.setUint32(0, 0xFFFFFFFE, le);
        test.strictEqual(bv.getUint32(0, le), 0xFFFFFFFE);
        test.strictEqual(bv.getInt32(0, le), -2);
        bv.setInt32(0, 0xFFFFFFFE, le);
        test.strictEqual(bv.getUint32(0, le), 0xFFFFFFFE);
        test.strictEqual(bv.getInt32(0, le), -2);
        bv.setInt32(0, -2, le);
        test.strictEqual(bv.getInt32(0, le), -2);
        test.strictEqual(bv.getUint32(0, le), 0xFFFFFFFE);
        bv.setUint32(0, -2, le);
        test.strictEqual(bv.getInt32(0, le), -2);
        test.strictEqual(bv.getUint32(0, le), 0xFFFFFFFE);
        le ? test.strictEqual(b.toString("hex"), "feffffff") : test.strictEqual(b.toString("hex"), "fffffffe");
    });
    test.end();
});

tape("float32", function(test) {
    var b = new Buffer(4),
        bv = new BufferView(b);
    bv.setFloat32(0, 0.125);
    test.strictEqual(bv.getFloat32(0), 0.125);
    var b2 = new Buffer(4);
    bv = new BufferView(b2);
    bv.setFloat32(0, 0.125, true);
    test.strictEqual(bv.getFloat32(0, true), 0.125);
    test.notEqual(b.toString("hex"), b2.toString("hex"));
    test.end();
});

tape("float64", function(test) {
    var b = new Buffer(8),
        bv = new BufferView(b);
    bv.setFloat64(0, 0.123);
    test.strictEqual(bv.getFloat64(0), 0.123);
    var b2 = new Buffer(8);
    bv = new BufferView(b2);
    bv.setFloat64(0, 0.123, true);
    test.strictEqual(bv.getFloat64(0, true), 0.123);
    test.notEqual(b.toString("hex"), b2.toString("hex"));
    test.end();
});