markov-typescript
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A Markov Chain library written in Typescript.
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<a href="../index.html">all files</a> / <a href="index.html">spec/</a> chain-state.spec.1.ts
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { ChainState } from "../src/";
import * as Collections from "typescript-collections";
import * as Helpers from "./helpers";
describe("ChainState<T>", () => {
describe("fromQueue", () => {
function makeNameQueue(): Collections.Queue<string> {
const names: Collections.Queue<string> = new Collections.Queue<string>();
names.enqueue("jim");
names.enqueue("george");
names.enqueue("bob");
names.enqueue("fred");
return names;
}
it("Should be same length as input", function () {
const names = makeNameQueue();
const chain = ChainState.fromQueue(names);
expect(chain.items.length).toEqual(names.size());
});
it("Should have same elements as input", function () {
const names = makeNameQueue();
const chain = ChainState.fromQueue(names);
for (let x = 0; x < chain.items.length; x++) {
expect(chain.items[x]).toBe(names.dequeue());
}
});
});
describe("constructor", () => {
function makeNameArray(): string[] {
return ["jim", "george", "bob", "fred"];
}
it("Should be same length as input", function () {
const names = makeNameArray();
const chain = new ChainState<string>(names);
expect(chain.items.length).toEqual(names.length);
});
it("Should have same elements as input", function () {
const names = makeNameArray();
const chain = new ChainState<string>(names);
for (let x = 0; x < names.length; x++) {
expect(chain.items[x]).toBe(names[x]);
}
});
});
describe("equals", () => {
function makeNameArray(): string[] {
return ["jim", "george", "bob", "fred"];
}
function makePersonArray(): Helpers.Person[] {
return [
new Helpers.Person("jim", 20),
new Helpers.Person("george", 18),
new Helpers.Person("bob", 25),
new Helpers.Person("fred", 46),
];
}
it("Should be same with equal strings", function () {
const names1 = makeNameArray();
const names2 = names1.slice(0);
const chain1 = new ChainState<string>(names1);
const chain2 = new ChainState<string>(names2);
expect(chain1.equals(chain2)).toBe(true);
});
it("Should be same based on values not references", function () {
const people1 = makePersonArray();
const people2 = makePersonArray();
const chain1 = new ChainState<Helpers.Person>(people1);
const chain2 = new ChainState<Helpers.Person>(people2);
expect(chain1.equals(chain2)).toBe(true);
});
it("Changing object field renders unequal", function () {
const people1 = makePersonArray();
const people2 = makePersonArray();
people2[2].age = 30;
const chain1 = new ChainState<Helpers.Person>(people1);
const chain2 = new ChainState<Helpers.Person>(people2);
expect(chain1.equals(chain2)).toBe(false);
});
it("Changing array length renders unequal", function () {
const people1 = makePersonArray();
const people2 = makePersonArray();
people2.push(new Helpers.Person("tom", 27));
const chain1 = new ChainState<Helpers.Person>(people1);
const chain2 = new ChainState<Helpers.Person>(people2);
expect(chain1.equals(chain2)).toBe(false);
});
});
});
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