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const versions = [ { base: "b0", head: "h0" }, { base: "b1", head: "h1" }];
// dispatches on `..` the way the loader doesconst view = (versionParam: string, rangeParam?: string): PullView => { const result = versionParam.includes("..") ? parseInterdiffRoute(versions, versionParam, rangeParam) : parseDiffRoute(versions, versionParam, rangeParam); if (isRedirect(result)) throw new Error(`unexpected redirect: ${result.redirect}`); return result;};
describe("parseRange", () => { it("accepts every shape the appview accepts", () => { expect(parseRange("")).toEqual({ base: "", head: "" }); expect(parseRange(" ")).toEqual({ base: "", head: "" }); expect(parseRange("abc")).toEqual({ base: "", head: "abc" }); expect(parseRange("a..b")).toEqual({ base: "a", head: "b" }); expect(parseRange("..b")).toEqual({ base: "", head: "b" }); expect(parseRange("a..")).toEqual({ base: "a", head: "" }); });
it("rejects empty and multi ranges", () => { expect(parseRange("..")).toBeNull(); expect(parseRange("a...b")).toBeNull(); expect(parseRange("a..b..c")).toBeNull(); });});
describe("parseDiffRoute", () => { it("resolves latest and numbers to the version's own ends", () => { expect(view("latest")).toEqual({ mode: "diff", version: 1, base: "b1", head: "h1" }); expect(view("0")).toMatchObject({ version: 0, base: "b0", head: "h0" }); });
it("takes an explicit range, and the base/head magic words", () => { expect(view("1", "c1..c2")).toMatchObject({ base: "c1", head: "c2" }); // a bare rev is a head, and the words fall back to the version's ends expect(view("1", "c2")).toMatchObject({ base: "b1", head: "c2" }); expect(view("1", "base..head")).toMatchObject({ base: "b1", head: "h1" }); });
it("resolves an empty version list instead of bouncing latest back to itself", () => { expect(parseDiffRoute([], "latest")).toEqual({ mode: "diff", version: 0, base: "", head: "" }); });
it("redirects a bad version to latest and a bad range to the version", () => { expect(parseDiffRoute(versions, "9")).toEqual({ redirect: "latest" }); expect(parseDiffRoute(versions, "foo")).toEqual({ redirect: "latest" }); expect(parseDiffRoute(versions, "-1")).toEqual({ redirect: "latest" }); expect(parseDiffRoute(versions, "1", "a..b..c")).toEqual({ redirect: "version" }); });});
describe("parseInterdiffRoute", () => { it("parses both versions, resolves their ends, and takes the change filter", () => { expect(view("0..1")).toEqual({ mode: "interdiff", oldVersion: 0, version: 1, from: { base: "b0", head: "h0" }, to: { base: "b1", head: "h1" }, changeId: "" }); expect(view("0..1", "all")).toMatchObject({ changeId: "" }); expect(view("0..1", "kmzwvxqo")).toMatchObject({ changeId: "kmzwvxqo" }); });
it("bounds-checks both sides instead of panicking", () => { expect(parseInterdiffRoute(versions, "0..9")).toEqual({ redirect: "latest" }); expect(parseInterdiffRoute(versions, "foo..1")).toEqual({ redirect: "latest" }); expect(parseInterdiffRoute(versions, "..1")).toEqual({ redirect: "latest" }); });});