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import { describe, expect, it } from "vitest";
import type { Diagnostic } from "vscode-languageserver-types";
import { pretty, report } from "../../src/lsp/diagnostic.js";
function diag(partial: Partial<Diagnostic> & { message: string }): Diagnostic {
return {
range: { start: { line: 0, character: 0 }, end: { line: 0, character: 1 } },
severity: 1,
...partial,
};
}
describe("lsp/diagnostic", () => {
describe("pretty", () => {
it("renders 1-based line/col with severity label", () => {
const out = pretty(
diag({
message: "Expected number",
range: { start: { line: 4, character: 2 }, end: { line: 4, character: 8 } },
}),
);
expect(out).toBe("ERROR [5:3] Expected number");
});
it("maps severities to labels", () => {
expect(pretty(diag({ message: "w", severity: 2 }))).toMatch(/^WARN /);
expect(pretty(diag({ message: "i", severity: 3 }))).toMatch(/^INFO /);
expect(pretty(diag({ message: "h", severity: 4 }))).toMatch(/^HINT /);
});
it("defaults missing severity to ERROR", () => {
expect(pretty(diag({ message: "x", severity: undefined }))).toMatch(/^ERROR /);
});
});
describe("report", () => {
it("returns empty string when there are no errors", () => {
expect(report("a.luau", [])).toBe("");
// Warnings only → still empty (errors-only).
expect(report("a.luau", [diag({ message: "w", severity: 2 })])).toBe("");
});
it("wraps errors in a <diagnostics file> block", () => {
const out = report("src/a.luau", [diag({ message: "boom" })]);
expect(out).toContain('<diagnostics file="src/a.luau">');
expect(out).toContain("ERROR [1:1] boom");
expect(out).toContain("</diagnostics>");
});
it("filters out non-error severities", () => {
const out = report("a.luau", [
diag({ message: "err" }),
diag({ message: "warn", severity: 2 }),
]);
expect(out).toContain("err");
expect(out).not.toContain("warn");
});
it("caps at 20 and notes the remainder", () => {
const issues = Array.from({ length: 25 }, (_, i) => diag({ message: `e${i}` }));
const out = report("a.luau", issues);
expect(out).toContain("... and 5 more");
expect(out).toContain("e0");
expect(out).not.toContain("e24");
});
});
});
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