Add vendored json-stringify-safe tests

Author: LewisJEllis

test/vendor/json-stringify-safe.test.js

@@ -0,0 +1,246 @@
+var Sinon = require("sinon")
+var stringify = require("..")
+function jsonify(obj) { return JSON.stringify(obj, null, 2) }
+
+describe("Stringify", function() {
+  it("must stringify circular objects", function() {
+    var obj = {name: "Alice"}
+    obj.self = obj
+    var json = stringify(obj, null, 2)
+    json.must.eql(jsonify({name: "Alice", self: "[Circular ~]"}))
+  })
+
+  it("must stringify circular objects with intermediaries", function() {
+    var obj = {name: "Alice"}
+    obj.identity = {self: obj}
+    var json = stringify(obj, null, 2)
+    json.must.eql(jsonify({name: "Alice", identity: {self: "[Circular ~]"}}))
+  })
+
+  it("must stringify circular objects deeper", function() {
+    var obj = {name: "Alice", child: {name: "Bob"}}
+    obj.child.self = obj.child
+
+    stringify(obj, null, 2).must.eql(jsonify({
+      name: "Alice",
+      child: {name: "Bob", self: "[Circular ~.child]"}
+    }))
+  })
+
+  it("must stringify circular objects deeper with intermediaries", function() {
+    var obj = {name: "Alice", child: {name: "Bob"}}
+    obj.child.identity = {self: obj.child}
+
+    stringify(obj, null, 2).must.eql(jsonify({
+      name: "Alice",
+      child: {name: "Bob", identity: {self: "[Circular ~.child]"}}
+    }))
+  })
+
+  it("must stringify circular objects in an array", function() {
+    var obj = {name: "Alice"}
+    obj.self = [obj, obj]
+
+    stringify(obj, null, 2).must.eql(jsonify({
+      name: "Alice", self: ["[Circular ~]", "[Circular ~]"]
+    }))
+  })
+
+  it("must stringify circular objects deeper in an array", function() {
+    var obj = {name: "Alice", children: [{name: "Bob"}, {name: "Eve"}]}
+    obj.children[0].self = obj.children[0]
+    obj.children[1].self = obj.children[1]
+
+    stringify(obj, null, 2).must.eql(jsonify({
+      name: "Alice",
+      children: [
+        {name: "Bob", self: "[Circular ~.children.0]"},
+        {name: "Eve", self: "[Circular ~.children.1]"}
+      ]
+    }))
+  })
+
+  it("must stringify circular arrays", function() {
+    var obj = []
+    obj.push(obj)
+    obj.push(obj)
+    var json = stringify(obj, null, 2)
+    json.must.eql(jsonify(["[Circular ~]", "[Circular ~]"]))
+  })
+
+  it("must stringify circular arrays with intermediaries", function() {
+    var obj = []
+    obj.push({name: "Alice", self: obj})
+    obj.push({name: "Bob", self: obj})
+
+    stringify(obj, null, 2).must.eql(jsonify([
+      {name: "Alice", self: "[Circular ~]"},
+      {name: "Bob", self: "[Circular ~]"}
+    ]))
+  })
+
+  it("must stringify repeated objects in objects", function() {
+    var obj = {}
+    var alice = {name: "Alice"}
+    obj.alice1 = alice
+    obj.alice2 = alice
+
+    stringify(obj, null, 2).must.eql(jsonify({
+      alice1: {name: "Alice"},
+      alice2: {name: "Alice"}
+    }))
+  })
+
+  it("must stringify repeated objects in arrays", function() {
+    var alice = {name: "Alice"}
+    var obj = [alice, alice]
+    var json = stringify(obj, null, 2)
+    json.must.eql(jsonify([{name: "Alice"}, {name: "Alice"}]))
+  })
+
+  it("must call given decycler and use its output", function() {
+    var obj = {}
+    obj.a = obj
+    obj.b = obj
+
+    var decycle = Sinon.spy(function() { return decycle.callCount })
+    var json = stringify(obj, null, 2, decycle)
+    json.must.eql(jsonify({a: 1, b: 2}, null, 2))
+
+    decycle.callCount.must.equal(2)
+    decycle.thisValues[0].must.equal(obj)
+    decycle.args[0][0].must.equal("a")
+    decycle.args[0][1].must.equal(obj)
+    decycle.thisValues[1].must.equal(obj)
+    decycle.args[1][0].must.equal("b")
+    decycle.args[1][1].must.equal(obj)
+  })
+
+  it("must call replacer and use its output", function() {
+    var obj = {name: "Alice", child: {name: "Bob"}}
+
+    var replacer = Sinon.spy(bangString)
+    var json = stringify(obj, replacer, 2)
+    json.must.eql(jsonify({name: "Alice!", child: {name: "Bob!"}}))
+
+    replacer.callCount.must.equal(4)
+    replacer.args[0][0].must.equal("")
+    replacer.args[0][1].must.equal(obj)
+    replacer.thisValues[1].must.equal(obj)
+    replacer.args[1][0].must.equal("name")
+    replacer.args[1][1].must.equal("Alice")
+    replacer.thisValues[2].must.equal(obj)
+    replacer.args[2][0].must.equal("child")
+    replacer.args[2][1].must.equal(obj.child)
+    replacer.thisValues[3].must.equal(obj.child)
+    replacer.args[3][0].must.equal("name")
+    replacer.args[3][1].must.equal("Bob")
+  })
+
+  it("must call replacer after describing circular references", function() {
+    var obj = {name: "Alice"}
+    obj.self = obj
+
+    var replacer = Sinon.spy(bangString)
+    var json = stringify(obj, replacer, 2)
+    json.must.eql(jsonify({name: "Alice!", self: "[Circular ~]!"}))
+
+    replacer.callCount.must.equal(3)
+    replacer.args[0][0].must.equal("")
+    replacer.args[0][1].must.equal(obj)
+    replacer.thisValues[1].must.equal(obj)
+    replacer.args[1][0].must.equal("name")
+    replacer.args[1][1].must.equal("Alice")
+    replacer.thisValues[2].must.equal(obj)
+    replacer.args[2][0].must.equal("self")
+    replacer.args[2][1].must.equal("[Circular ~]")
+  })
+
+  it("must call given decycler and use its output for nested objects",
+    function() {
+    var obj = {}
+    obj.a = obj
+    obj.b = {self: obj}
+
+    var decycle = Sinon.spy(function() { return decycle.callCount })
+    var json = stringify(obj, null, 2, decycle)
+    json.must.eql(jsonify({a: 1, b: {self: 2}}))
+
+    decycle.callCount.must.equal(2)
+    decycle.args[0][0].must.equal("a")
+    decycle.args[0][1].must.equal(obj)
+    decycle.args[1][0].must.equal("self")
+    decycle.args[1][1].must.equal(obj)
+  })
+
+  it("must use decycler's output when it returned null", function() {
+    var obj = {a: "b"}
+    obj.self = obj
+    obj.selves = [obj, obj]
+
+    function decycle() { return null }
+    stringify(obj, null, 2, decycle).must.eql(jsonify({
+      a: "b",
+      self: null,
+      selves: [null, null]
+    }))
+  })
+
+  it("must use decycler's output when it returned undefined", function() {
+    var obj = {a: "b"}
+    obj.self = obj
+    obj.selves = [obj, obj]
+
+    function decycle() {}
+    stringify(obj, null, 2, decycle).must.eql(jsonify({
+      a: "b",
+      selves: [null, null]
+    }))
+  })
+
+  it("must throw given a decycler that returns a cycle", function() {
+    var obj = {}
+    obj.self = obj
+    var err
+    function identity(key, value) { return value }
+    try { stringify(obj, null, 2, identity) } catch (ex) { err = ex }
+    err.must.be.an.instanceof(TypeError)
+  })
+
+  describe(".getSerialize", function() {
+    it("must stringify circular objects", function() {
+      var obj = {a: "b"}
+      obj.circularRef = obj
+      obj.list = [obj, obj]
+
+      var json = JSON.stringify(obj, stringify.getSerialize(), 2)
+      json.must.eql(jsonify({
+        "a": "b",
+        "circularRef": "[Circular ~]",
+        "list": ["[Circular ~]", "[Circular ~]"]
+      }))
+    })
+
+    // This is the behavior as of Mar 3, 2015.
+    // The serializer function keeps state inside the returned function and
+    // so far I'm not sure how to not do that. JSON.stringify's replacer is not
+    // called _after_ serialization.
+    xit("must return a function that could be called twice", function() {
+      var obj = {name: "Alice"}
+      obj.self = obj
+
+      var json
+      var serializer = stringify.getSerialize()
+
+      json = JSON.stringify(obj, serializer, 2)
+      json.must.eql(jsonify({name: "Alice", self: "[Circular ~]"}))
+
+      json = JSON.stringify(obj, serializer, 2)
+      json.must.eql(jsonify({name: "Alice", self: "[Circular ~]"}))
+    })
+  })
+})
+
+function bangString(key, value) {
+  return typeof value == "string" ? value + "!" : value
+}