test: add test for declarationUrl

Author: velut

lib/declaration-url.test.ts

@@ -0,0 +1,41 @@
+import { expect, test } from "vitest";
+import { makeDeclarationUrl } from "./declaration-url";
+
+test("declarationUrl", () => {
+	const declarationUrl = makeDeclarationUrl([
+		{
+			kind: "variable",
+			id: "foo",
+			name: "foo",
+			docs: [],
+			file: "foo.ts",
+			line: 123,
+			signature: "const foo: Foo;",
+		},
+		{
+			kind: "namespace",
+			id: "bar",
+			name: "bar",
+			docs: [],
+			file: "bar.ts",
+			line: 456,
+			signature: "",
+			declarations: [
+				{
+					kind: "variable",
+					id: "bar.qux",
+					name: "qux",
+					docs: [],
+					file: "qux.ts",
+					line: 789,
+					signature: "const qux: Qux;",
+				},
+			],
+		},
+	]);
+	expect(declarationUrl("Awaited")).toMatchInlineSnapshot(
+		`"https://www.typescriptlang.org/docs/handbook/utility-types.html#awaitedtype"`,
+	);
+	expect(declarationUrl("foo")).toMatchInlineSnapshot(`"#foo"`);
+	expect(declarationUrl("qux")).toMatchInlineSnapshot(`"#bar.qux"`);
+});