feat: Pass PR number to the getPullChanges

so we can get file coverage report without relying on the context.

src/index.ts

@@ -43,7 +43,10 @@ const run = async () => {
 		.addRaw(tableData);
 
 	if (fileCoverageMode !== FileCoverageMode.None) {
-		const pullChanges = await getPullChanges(fileCoverageMode);
+		const pullChanges = await getPullChanges({
+			fileCoverageMode,
+			prNumber: processedPrNumber,
+		});
 		const jsonFinal = await parseVitestJsonFinal(jsonFinalPath);
 		const fileTable = generateFileCoverageHtml({
 			jsonSummary,

src/inputs/getPullChanges.test.ts

@@ -0,0 +1,82 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { FileCoverageMode } from "./FileCoverageMode";
+import { getPullChanges } from "./getPullChanges";
+
+const mockGetInput = vi.hoisted(() => vi.fn());
+vi.mock("@actions/core", () => ({
+	getInput: mockGetInput,
+	endGroup: vi.fn(),
+	startGroup: vi.fn(),
+	info: vi.fn(),
+	debug: vi.fn(),
+}));
+
+const mockContext = vi.hoisted(() => ({
+	repo: {
+		owner: "owner",
+		repo: "repo",
+	},
+	payload: {},
+}));
+const mockGetOctokit = vi.hoisted(() => vi.fn());
+vi.mock("@actions/github", () => ({
+	context: mockContext,
+	getOctokit: mockGetOctokit,
+}));
+
+describe("getPullChanges", () => {
+	beforeEach(() => {
+		vi.clearAllMocks();
+		mockGetInput.mockReturnValue("fake-token");
+		const mockOctokit = {
+			paginate: {
+				iterator: vi.fn().mockReturnValue([
+					{
+						data: [
+							{ status: "added", filename: "file1.ts" },
+							{ status: "modified", filename: "file2.ts" },
+						],
+					},
+				]),
+			},
+			rest: {
+				pulls: {
+					listFiles: vi.fn(),
+				},
+			},
+		};
+		mockGetOctokit.mockReturnValue(mockOctokit);
+	});
+
+	it("should return an empty array if fileCoverageMode is None", async () => {
+		const result = await getPullChanges({
+			fileCoverageMode: FileCoverageMode.None,
+		});
+		expect(result).toEqual([]);
+	});
+
+	it("should return an empty array if prNumber is not provided and context payload has no pull request number", async () => {
+		mockContext.payload = {};
+		const result = await getPullChanges({
+			fileCoverageMode: FileCoverageMode.All,
+		});
+		expect(result).toEqual([]);
+	});
+
+	it("should fetch and return changed files when prNumber is provided but not in the context", async () => {
+		mockContext.payload = {};
+		const result = await getPullChanges({
+			fileCoverageMode: FileCoverageMode.All,
+			prNumber: 123,
+		});
+		expect(result).toEqual(["file1.ts", "file2.ts"]);
+	});
+
+	it("should fetch and return changed files when prNumber is in the context but not provided", async () => {
+		mockContext.payload = { pull_request: { number: 123 } };
+		const result = await getPullChanges({
+			fileCoverageMode: FileCoverageMode.All,
+		});
+		expect(result).toEqual(["file1.ts", "file2.ts"]);
+	});
+});

src/inputs/getPullChanges.ts

@@ -5,21 +5,25 @@ import { FileCoverageMode } from "./FileCoverageMode";
 
 type Octokit = ReturnType<typeof github.getOctokit>;
 
-export async function getPullChanges(
-	fileCoverageMode: FileCoverageMode,
-): Promise<string[]> {
+interface Params {
+	fileCoverageMode: FileCoverageMode;
+	prNumber?: number;
+}
+
+export async function getPullChanges({
+	fileCoverageMode,
+	prNumber = github.context.payload.pull_request?.number,
+}: Params): Promise<string[]> {
 	// Skip Changes collection if we don't need it
 	if (fileCoverageMode === FileCoverageMode.None) {
 		return [];
 	}
 
-	// Skip Changes collection if we can't do it
-	if (!github.context.payload?.pull_request) {
+	if (!prNumber) {
 		return [];
 	}
 
 	const gitHubToken = core.getInput("github-token").trim();
-	const prNumber = github.context.payload.pull_request.number;
 	try {
 		const octokit: Octokit = github.getOctokit(gitHubToken);
 		const paths: string[] = [];