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node_modules/needle/test/compression_spec.js

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+var should = require('should'),
+    needle = require('./../'),
+    http   = require('http'),
+    zlib   = require('zlib'),
+    stream = require('stream'),
+    port   = 11123,
+    server;
+
+describe('compression', function(){
+
+  require.bind(null, 'zlib').should.not.throw()
+
+  var jsonData = '{"foo":"bar"}';
+
+  describe('when server supports compression', function(){
+
+    before(function(){
+      server = http.createServer(function(req, res) {
+        var raw = new stream.PassThrough();
+
+        var acceptEncoding = req.headers['accept-encoding'];
+        if (!acceptEncoding) {
+          acceptEncoding = '';
+        }
+
+        if (acceptEncoding.match(/\bdeflate\b/)) {
+          res.setHeader('Content-Encoding', 'deflate');
+          raw.pipe(zlib.createDeflate()).pipe(res);
+        } else if (acceptEncoding.match(/\bgzip\b/)) {
+          res.setHeader('Content-Encoding', 'gzip');
+          raw.pipe(zlib.createGzip()).pipe(res);
+        } else if (acceptEncoding.match(/\bbr\b/)) {
+          res.setHeader('Content-Encoding', 'br');
+          raw.pipe(zlib.createBrotliCompress()).pipe(res);
+        } else {
+          raw.pipe(res);
+        }
+
+        res.setHeader('Content-Type', 'application/json')
+        if (req.headers['with-bad']) {
+          res.end('foo'); // end, no deflate data
+        } else {
+          raw.end(jsonData)
+        }
+
+      })
+
+      server.listen(port);
+    });
+
+    after(function(done){
+      server.close(done);
+    })
+
+    describe('and client requests no compression', function() {
+      it('should have the body decompressed', function(done){
+        needle.get('localhost:' + port, function(err, response, body){
+          should.ifError(err);
+          body.should.have.property('foo', 'bar');
+          response.bytes.should.equal(jsonData.length);
+          done();
+        })
+      })
+    })
+
+    describe('and client requests gzip compression', function() {
+      it('should have the body decompressed', function(done){
+        needle.get('localhost:' + port, {headers: {'Accept-Encoding': 'gzip'}}, function(err, response, body){
+          should.ifError(err);
+          body.should.have.property('foo', 'bar');
+          response.bytes.should.not.equal(jsonData.length);
+          done();
+        })
+      })
+    })
+
+    describe('and client requests deflate compression', function() {
+      it('should have the body decompressed', function(done){
+        needle.get('localhost:' + port, {headers: {'Accept-Encoding': 'deflate'}}, function(err, response, body){
+          should.ifError(err);
+          body.should.have.property('foo', 'bar');
+          response.bytes.should.not.equal(jsonData.length);
+          done();
+        })
+      })
+
+      it('should rethrow errors from decompressors', function(done){
+        needle.get('localhost:' + port, {headers: {'Accept-Encoding': 'deflate', 'With-Bad': 'true'}}, function(err, response, body) {
+          should.exist(err);
+          err.message.should.equal("incorrect header check");
+          err.code.should.equal("Z_DATA_ERROR")
+          done();
+        })
+      })
+    })
+
+    describe('and client requests brotli compression', function() {
+      it('should have the body decompressed', function(done){
+        // Skip this test if Brotli is not supported
+        if (typeof zlib.BrotliDecompress !== 'function') {
+          return done();
+        }
+        needle.get('localhost:' + port, {headers: {'Accept-Encoding': 'br'}}, function(err, response, body){
+          should.ifError(err);
+          body.should.have.property('foo', 'bar');
+          response.bytes.should.not.equal(jsonData.length);
+          done();
+        })
+      })
+    })
+  })
+})