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index.spec.js
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index.spec.js
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const rover = require("./rover.js");
describe("mars rover", () => {
it("returns the initial position and direction when no commands are given", () => {
const x = 5;
const y = 7;
const direction = "N";
const result = rover({ x, y, direction })("");
expect(result.x).toBe(x);
expect(result.y).toBe(y);
expect(result.direction).toBe(direction);
});
it("returns the initial position and west direction when left is passed as a command for a north facing rover", () => {
const x = 5;
const y = 7;
const direction = "N";
const result = rover({ x, y, direction })("L");
expect(result.x).toBe(x);
expect(result.y).toBe(y);
expect(result.direction).toBe("W");
});
it("returns the initial position and south direction when left is passed as a command for a west facing rover", () => {
const x = 5;
const y = 7;
const direction = "W";
const result = rover({ x, y, direction })("L");
expect(result.x).toBe(x);
expect(result.y).toBe(y);
expect(result.direction).toBe("S");
});
it("returns the initial position and east direction when right is passed as a command for a north facing rover", () => {
const x = 5;
const y = 7;
const direction = "N";
const result = rover({ x, y, direction })("R");
expect(result.x).toBe(x);
expect(result.y).toBe(y);
expect(result.direction).toBe("E");
});
it("returns the initial position and direction when turning left and turning right", () => {
const initial = {
x: 5,
y: 7,
direction: "N"
};
const result = rover(initial)("LR");
expect(result).toEqual(initial);
});
it("returns south position when turning left twice from north facing rover", () => {
const x = 5;
const y = 7;
const direction = "N";
const result = rover({ x, y, direction })("LL");
expect(result).toEqual({ x, y, direction: "S" });
});
it("throws an error when getting a command that does not exist", () => {
const x = 5;
const y = 7;
const direction = "N";
expect(() => rover({ x, y, direction })("LLK")).toThrow();
});
it("returns a northern position and same direction when going forward", () => {
const x = 5;
const y = 7;
const direction = "N";
const result = rover({ x, y, direction })("FLLLLF");
expect(result.x).toBe(x);
expect(result.y).toBe(y - 2);
expect(result.direction).toBe("N");
});
});