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describe("RNG", function() {
describe("getUniform", function() {
var value = ROT.RNG.getUniform();
it("should return a number", function() {
expect(typeof(value)).toEqual("number");
});
it("should return a number 0..1", function() {
expect(value).toBeGreaterThan(0);
expect(value).toBeLessThan(1);
});
});
describe("seeding", function() {
it("should return a seed number", function() {
expect(typeof(ROT.RNG.getSeed())).toEqual("number");
});
it("should return the same value for a given seed", function() {
var seed = Math.round(Math.random()*1000000);
ROT.RNG.setSeed(seed);
var val1 = ROT.RNG.getUniform();
ROT.RNG.setSeed(seed);
var val2 = ROT.RNG.getUniform();
expect(val1).toEqual(val2);
});
it("should return a precomputed value for a given seed", function() {
ROT.RNG.setSeed(12345);
var val = ROT.RNG.getUniform();
expect(val).toEqual(0.01198604702949524);
});
});
describe("state manipulation", function() {
it("should return identical values after setting identical states", function() {
ROT.RNG.getUniform();
var state = ROT.RNG.getState();
var val1 = ROT.RNG.getUniform();
ROT.RNG.setState(state);
var val2 = ROT.RNG.getUniform();
expect(val1).toEqual(val2);
});
});
});
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