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'use strict';
const common = require('../common');
const fixtures = require('../common/fixtures');
const assert = require('assert');
const zlib = require('zlib');
// Test some brotli-specific properties of the brotli streams that can not
// be easily covered through expanding zlib-only tests.
const sampleBuffer = fixtures.readSync('/pss-vectors.json');
{
// Test setting the quality parameter at stream creation:
const sizes = [];
for (let quality = zlib.constants.BROTLI_MIN_QUALITY;
quality <= zlib.constants.BROTLI_MAX_QUALITY;
quality++) {
const encoded = zlib.brotliCompressSync(sampleBuffer, {
params: {
[zlib.constants.BROTLI_PARAM_QUALITY]: quality
}
});
sizes.push(encoded.length);
}
// Increasing quality should roughly correspond to decreasing compressed size:
for (let i = 0; i < sizes.length - 1; i++) {
assert(sizes[i + 1] <= sizes[i] * 1.05, sizes); // 5 % margin of error.
}
assert(sizes[0] > sizes[sizes.length - 1], sizes);
}
{
// Test that setting out-of-bounds option values or keys fails.
common.expectsError(() => {
zlib.createBrotliCompress({
params: {
10000: 0
}
});
}, {
code: 'ERR_BROTLI_INVALID_PARAM',
type: RangeError,
message: '10000 is not a valid Brotli parameter'
});
// Test that accidentally using duplicate keys fails.
common.expectsError(() => {
zlib.createBrotliCompress({
params: {
'0': 0,
'00': 0
}
});
}, {
code: 'ERR_BROTLI_INVALID_PARAM',
type: RangeError,
message: '00 is not a valid Brotli parameter'
});
common.expectsError(() => {
zlib.createBrotliCompress({
params: {
// This is a boolean flag
[zlib.constants.BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING]: 42
}
});
}, {
code: 'ERR_ZLIB_INITIALIZATION_FAILED',
type: Error,
message: 'Initialization failed'
});
}