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app_vue/node_modules/hpack.js/test/compressor-test.js

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+var assert = require('assert');
+var hpack = require('../');
+var fixtures = require('./fixtures');
+
+describe('hpack/compressor', function() {
+  var comp;
+
+  beforeEach(function() {
+    comp = hpack.compressor.create({
+      table: {
+        maxSize: 1024
+      }
+    });
+  });
+
+  function expect(arr, enc) {
+    function isNumber(num) {
+      return typeof num === 'number';
+    }
+
+    var out = comp.read().toString('hex');
+    if (Array.isArray(arr) && !arr.every(isNumber)) {
+      arr = arr.map(function(item) {
+        return new Buffer(item, enc);
+      });
+      arr = Buffer.concat(arr);
+    } else {
+      arr = new Buffer(arr, enc);
+    }
+    var actual = arr.toString('hex');
+    assert.equal(out, actual);
+  }
+
+  describe('indexed field', function() {
+    it('should lookup entry from static table', function() {
+      comp.write([{ name: ':method', value: 'GET' }]);
+      expect([ 0b10000000 | 2 ]);
+    });
+
+    it('should fetch entry from the end of the static table', function() {
+      comp.write([{ name: 'www-authenticate', value: '' }]);
+      expect([ 0b10000000 | 61 ]);
+    });
+  });
+
+  describe('literal field', function() {
+    it('should lookup name in the table (incremental)', function() {
+      comp.write([{ name: 'host', value: 'localhost' }]);
+      expect('6686a0e41d139d09', 'hex');
+
+      comp.write([{ name: 'host', value: 'localhost' }]);
+      expect([ 0b10000000 | 62 ]);
+    });
+
+    it('should lookup name in the table (not-incremental)', function() {
+      comp.write([{ name: 'host', value: 'localhost', incremental: false }]);
+      expect('0f1786a0e41d139d09', 'hex');
+
+      // Should not use the table
+      comp.write([{ name: 'host', value: 'localhost' }]);
+      expect('6686a0e41d139d09', 'hex');
+    });
+
+    it('should evict header field from the table', function() {
+      for (var i = 0; i < 1000; i++) {
+        comp.write([{ name: 'host', value: 'localhost' + i }]);
+        comp.read();
+      }
+
+      assert(comp._table.size < comp._table.maxSize);
+      assert.equal(comp._table.dynamic.length, 21);
+    });
+  });
+
+  describe('update size', function() {
+    it('should evict header field from the table', function() {
+      comp.write([{ name: 'host', value: 'localhost' }]);
+      expect('6686a0e41d139d09', 'hex');
+
+      comp.reset();
+
+      // update=0, update=maxSize
+      expect('203fe107', 'hex');
+
+      comp.write([{ name: 'host', value: 'localhost' }]);
+      expect('6686a0e41d139d09', 'hex');
+    });
+
+    it('should send dynamic update if size >= protocolMaxSize', function() {
+      comp.updateTableSize(Infinity);
+
+      // update=maxSize
+      expect('3fe107', 'hex');
+    });
+  });
+
+  describe('spec examples', function() {
+    beforeEach(function() {
+      comp = hpack.compressor.create({
+        table: {
+          maxSize: 256
+        }
+      });
+    });
+
+    var tests = fixtures.specExamples;
+
+    tests.forEach(function(test, i) {
+      var prev = tests[i - 1];
+      it('should give expected output on ' + test.id, function() {
+        var startFrom = test.continuation ? prev.comp : comp;
+        if (!startFrom)
+          throw new Error('Previous test failed');
+        comp = startFrom;
+
+        comp.write(test.output.map(function(pair) {
+          return { name: pair[0], value: pair[1], huffman: test.huffman };
+        }));
+        expect(test.input.replace(/ /g, ''), 'hex');
+
+        // Verify table contents
+        assert.deepEqual(comp._table.dynamic.map(function(header) {
+          return [ header.name, header.value, header.totalSize ];
+        }).reverse(), test.table);
+
+        // Verify table size
+        var expectedSize = test.table.reduce(function(acc, item) {
+          return acc + item[2];
+        }, 0);
+        assert.equal(comp._table.size, expectedSize);
+
+        test.comp = comp;
+      });
+    });
+  });
+});