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map-test.js
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var vows = require("vows"),
load = require("../load"),
assert = require("../assert");
var suite = vows.describe("d3.map");
suite.addBatch({
"map": {
topic: load("arrays/map").expression("d3.map"),
"constructor": {
"map() returns an empty map": function(map) {
var m = map();
assert.deepEqual(m.keys(), []);
},
"map(null) returns an empty map": function(map) {
var m = map(null);
assert.deepEqual(m.keys(), []);
},
"map(object) copies enumerable keys": function(map) {
var m = map({foo: 42});
assert.isTrue(m.has("foo"));
assert.equal(m.get("foo"), 42);
var m = map(Object.create(null, {foo: {value: 42, enumerable: true}}));
assert.isTrue(m.has("foo"));
assert.equal(m.get("foo"), 42);
},
"map(object) copies inherited keys": function(map) {
function Foo() {}
Foo.prototype.foo = 42;
var m = map(Object.create({foo: 42}));
assert.isTrue(m.has("foo"));
assert.equal(m.get("foo"), 42);
var m = map(new Foo());
assert.isTrue(m.has("foo"));
assert.equal(m.get("foo"), 42);
},
"map(object) does not copy non-enumerable keys": function(map) {
var m = map({__proto__: 42}); // because __proto__ isn't enumerable
assert.isFalse(m.has("__proto__"));
assert.isUndefined(m.get("__proto__"));
var m = map(Object.create(null, {foo: {value: 42, enumerable: false}}));
assert.isFalse(m.has("foo"));
assert.isUndefined(m.get("foo"));
},
"map(map) copies the given map": function(map) {
var a = map({foo: 42}),
b = map(a);
assert.isTrue(b.has("foo"));
assert.equal(b.get("foo"), 42);
a.set("bar", true);
assert.isFalse(b.has("bar"));
},
"map(array) creates a map by index": function(map) {
assert.deepEqual(map(["foo", "bar"]).entries(), [{key: "0", value: "foo"}, {key: "1", value: "bar"}]);
},
"map(array) indexes missing elements in sparse arrays": function(map) {
assert.deepEqual(map(["foo", , "bar"]).entries(), [{key: "0", value: "foo"}, {key: "1", value: undefined}, {key: "2", value: "bar"}]);
},
"map(array, f) creates a map by accessor": function(map) {
assert.deepEqual(map([{field: "foo"}, {field: "bar"}], function(d) { return d.field; }).entries(), [{key: "foo", value: {field: "foo"}}, {key: "bar", value: {field: "bar"}}]);
assert.deepEqual(map([{field: "foo"}, {field: "bar"}], function(d, i) { return i; }).entries(), [{key: "0", value: {field: "foo"}}, {key: "1", value: {field: "bar"}}]);
assert.deepEqual(map([{field: "foo"}, {field: "bar"}], function(d, i) { return this[i].field; }).entries(), [{key: "foo", value: {field: "foo"}}, {key: "bar", value: {field: "bar"}}]);
}
},
"size": {
"returns the number of distinct keys": function(map) {
var m = map();
assert.deepEqual(m.size(), 0);
m.set("foo", 1);
assert.deepEqual(m.size(), 1);
m.set("foo", 2);
assert.deepEqual(m.size(), 1);
m.set("bar", 2);
assert.deepEqual(m.size(), 2);
m.remove("foo");
assert.deepEqual(m.size(), 1);
m.remove("foo");
assert.deepEqual(m.size(), 1);
m.remove("bar");
assert.deepEqual(m.size(), 0);
}
},
"empty": {
"returns true only if the map is empty": function(map) {
var m = map();
assert.isTrue(m.empty());
m.set("foo", 1);
assert.isFalse(m.empty());
m.set("foo", 2);
assert.isFalse(m.empty());
m.set("bar", 2);
assert.isFalse(m.empty());
m.remove("foo");
assert.isFalse(m.empty());
m.remove("foo");
assert.isFalse(m.empty());
m.remove("bar");
assert.isTrue(m.empty());
}
},
"forEach": {
"passes key and value": function(map) {
var m = map({foo: 1, bar: "42"}),
c = [];
m.forEach(function(k, v) { c.push([k, v]); });
c.sort(function(a, b) { return a[0].localeCompare(b[0]); });
assert.deepEqual(c, [["bar", "42"], ["foo", 1]]);
},
"uses the map as the context": function(map) {
var m = map({foo: 1, bar: "42"}),
c = [];
m.forEach(function() { c.push(this); });
assert.strictEqual(c[0], m);
assert.strictEqual(c[1], m);
assert.equal(c.length, 2);
},
"iterates in arbitrary order": function(map) {
var m1 = map({foo: 1, bar: "42"}),
m2 = map({bar: "42", foo: 1}),
c1 = [],
c2 = [];
m1.forEach(function(k, v) { c1.push([k, v]); });
m2.forEach(function(k, v) { c2.push([k, v]); });
c1.sort(function(a, b) { return a[0].localeCompare(b[0]); });
c2.sort(function(a, b) { return a[0].localeCompare(b[0]); });
assert.deepEqual(c1, c2);
}
},
"keys": {
"returns an array of string keys": function(map) {
var m = map({foo: 1, bar: "42"});
assert.deepEqual(m.keys().sort(), ["bar", "foo"]);
},
"properly unescapes zero-prefixed keys": function(map) {
var m = map();
m.set("__proto__", 42);
m.set("\0weird", 42);
assert.deepEqual(m.keys().sort(), ["\0weird", "__proto__"]);
}
},
"values": {
"returns an array of arbitrary values": function(map) {
var m = map({foo: 1, bar: "42"});
assert.deepEqual(m.values().sort(), [1, "42"]);
}
},
"entries": {
"returns an array of key-value objects": function(map) {
var m = map({foo: 1, bar: "42"});
assert.deepEqual(m.entries().sort(ascendingByKey), [{key: "bar", value: "42"}, {key: "foo", value: 1}]);
},
"empty maps have an empty entries array": function(map) {
var m = map();
assert.deepEqual(m.entries(), []);
m.set("foo", "bar");
assert.deepEqual(m.entries(), [{key: "foo", value: "bar"}]);
m.remove("foo");
assert.deepEqual(m.entries(), []);
},
"entries are returned in arbitrary order": function(map) {
var m = map({foo: 1, bar: "42"});
assert.deepEqual(m.entries().sort(ascendingByKey), [{key: "bar", value: "42"}, {key: "foo", value: 1}]);
var m = map({bar: "42", foo: 1});
assert.deepEqual(m.entries().sort(ascendingByKey), [{key: "bar", value: "42"}, {key: "foo", value: 1}]);
},
"observes changes via set and remove": function(map) {
var m = map({foo: 1, bar: "42"});
assert.deepEqual(m.entries().sort(ascendingByKey), [{key: "bar", value: "42"}, {key: "foo", value: 1}]);
m.remove("foo");
assert.deepEqual(m.entries(), [{key: "bar", value: "42"}]);
m.set("bar", "bar");
assert.deepEqual(m.entries(), [{key: "bar", value: "bar"}]);
m.set("foo", "foo");
assert.deepEqual(m.entries().sort(ascendingByKey), [{key: "bar", value: "bar"}, {key: "foo", value: "foo"}]);
m.remove("bar");
assert.deepEqual(m.entries(), [{key: "foo", value: "foo"}]);
m.remove("foo");
assert.deepEqual(m.entries(), []);
m.remove("foo");
assert.deepEqual(m.entries(), []);
}
},
"has": {
"empty maps do not have object built-ins": function(map) {
var m = map();
assert.isFalse(m.has("__proto__"));
assert.isFalse(m.has("hasOwnProperty"));
},
"can has keys using built-in names": function(map) {
var m = map();
m.set("__proto__", 42);
assert.isTrue(m.has("__proto__"));
},
"can has keys with null or undefined properties": function(map) {
var m = map();
m.set("", "");
m.set("null", null);
m.set("undefined", undefined);
assert.isTrue(m.has(""));
assert.isTrue(m.has("null"));
assert.isTrue(m.has("undefined"));
},
"coerces keys to strings": function(map) {
var m = map({"42": "foo", "null": 1, "undefined": 2});
assert.isTrue(m.has(42));
assert.isTrue(m.has(null));
assert.isTrue(m.has(undefined));
},
"returns the latest value": function(map) {
var m = map({foo: 42});
assert.isTrue(m.has("foo"));
m.set("foo", 43);
assert.isTrue(m.has("foo"));
m.remove("foo");
assert.isFalse(m.has("foo"));
m.set("foo", "bar");
assert.isTrue(m.has("foo"));
},
"returns undefined for missing keys": function(map) {
var m = map({foo: 42});
assert.isFalse(m.has("bar"));
}
},
"get": {
"empty maps do not have object built-ins": function(map) {
var m = map();
assert.isUndefined(m.get("__proto__"));
assert.isUndefined(m.get("hasOwnProperty"));
},
"can get keys using built-in names": function(map) {
var m = map();
m.set("__proto__", 42);
assert.equal(m.get("__proto__"), 42);
},
"coerces keys to strings": function(map) {
var m = map({"42": 1, "null": 2, "undefined": 3});
assert.equal(m.get(42), 1);
assert.equal(m.get(null), 2);
assert.equal(m.get(undefined), 3);
},
"returns the latest value": function(map) {
var m = map({foo: 42});
assert.equal(m.get("foo"), 42);
m.set("foo", 43);
assert.equal(m.get("foo"), 43);
m.remove("foo");
assert.isUndefined(m.get("foo"));
m.set("foo", "bar");
assert.equal(m.get("foo"), "bar");
},
"returns undefined for missing keys": function(map) {
var m = map({foo: 42});
assert.isUndefined(m.get("bar"));
}
},
"set": {
"returns the set value": function(map) {
var m = map();
assert.equal(m.set("foo", 42), 42);
},
"can set keys using built-in names": function(map) {
var m = map();
m.set("__proto__", 42);
assert.equal(m.get("__proto__"), 42);
},
"can set keys using zero-prefixed names": function(map) {
var m = map();
m.set("\0weird", 42);
assert.equal(m.get("\0weird"), 42);
},
"coerces keys to strings": function(map) {
var m = map();
m.set(42, 1);
assert.equal(m.get(42), 1);
m.set(null, 2);
assert.equal(m.get(null), 2);
m.set(undefined, 3);
assert.equal(m.get(undefined), 3);
assert.deepEqual(m.keys().sort(), ["42", "null", "undefined"]);
},
"can replace values": function(map) {
var m = map({foo: 42});
assert.equal(m.get("foo"), 42);
m.set("foo", 43);
assert.equal(m.get("foo"), 43);
m.set("foo", "bar");
assert.equal(m.get("foo"), "bar");
},
"can set null, undefined or empty string values": function(map) {
var m = map();
m.set("", "");
m.set("null", null);
m.set("undefined", undefined);
assert.equal(m.get(""), "");
assert.isNull(m.get("null"));
assert.isUndefined(m.get("undefined"));
}
}
}
});
function ascendingByKey(a, b) {
return a.key.localeCompare(b.key);
}
suite.export(module);