84 lines
2.6 KiB
TypeScript
84 lines
2.6 KiB
TypeScript
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import { describe, expect, test } from "bun:test";
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import { extractHunkPatch, splitPatchIntoHunks } from "./patchFileDiff";
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const SAMPLE_PATCH = `diff --git a/foo.txt b/foo.txt
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index 1111111..2222222 100644
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--- a/foo.txt
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+++ b/foo.txt
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@@ -1,4 +1,5 @@
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line1
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+added-top
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line2
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line3
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line4
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@@ -10,3 +11,4 @@
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line10
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-deleted-mid
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line11
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+added-bottom
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`;
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describe("splitPatchIntoHunks", () => {
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test("splits a multi-hunk patch into standalone per-hunk patches", () => {
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const hunks = splitPatchIntoHunks(SAMPLE_PATCH);
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expect(hunks.length).toBe(2);
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expect(hunks[0]).toContain("diff --git a/foo.txt b/foo.txt");
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expect(hunks[0]).toContain("--- a/foo.txt");
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expect(hunks[0]).toContain("+++ b/foo.txt");
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expect(hunks[0]).toContain("@@ -1,4 +1,5 @@");
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expect(hunks[0]).toContain("+added-top");
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expect(hunks[0]).not.toContain("@@ -10,3 +11,4 @@");
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expect(hunks[0]).not.toContain("added-bottom");
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expect(hunks[1]).toContain("@@ -10,3 +11,4 @@");
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expect(hunks[1]).toContain("-deleted-mid");
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expect(hunks[1]).toContain("+added-bottom");
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expect(hunks[1]).not.toContain("added-top");
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});
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test("each hunk keeps the file header so it applies on its own", () => {
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const hunks = splitPatchIntoHunks(SAMPLE_PATCH);
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for (const hunk of hunks) {
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expect(hunk.startsWith("diff --git a/foo.txt b/foo.txt\n")).toBe(true);
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expect(hunk.match(/^--- a\/foo.txt$/m)).not.toBeNull();
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expect(hunk.match(/^\+\+\+ b\/foo.txt$/m)).not.toBeNull();
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expect(hunk.match(/^@@\s/m)).not.toBeNull();
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}
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});
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test("returns [] for an empty patch or a patch without hunks", () => {
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expect(splitPatchIntoHunks("")).toEqual([]);
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expect(splitPatchIntoHunks("diff --git a/foo b/foo\n--- a/foo\n+++ b/foo\n")).toEqual([]);
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});
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test("handles a single-hunk patch", () => {
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const single = `diff --git a/a b/a
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--- a/a
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+++ b/a
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@@ -1,1 +1,2 @@
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a
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+b
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`;
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const hunks = splitPatchIntoHunks(single);
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expect(hunks.length).toBe(1);
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expect(hunks[0]).toContain("+b");
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});
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});
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describe("extractHunkPatch", () => {
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test("returns the standalone patch for the requested index", () => {
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const second = extractHunkPatch(SAMPLE_PATCH, 1);
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expect(second).not.toBeNull();
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expect(second).toContain("@@ -10,3 +11,4 @@");
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expect(second).toContain("diff --git a/foo.txt b/foo.txt");
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});
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test("returns null for out-of-range or invalid indices", () => {
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expect(extractHunkPatch(SAMPLE_PATCH, -1)).toBeNull();
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expect(extractHunkPatch(SAMPLE_PATCH, 2)).toBeNull();
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expect(extractHunkPatch(SAMPLE_PATCH, 1.5)).toBeNull();
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expect(extractHunkPatch("", 0)).toBeNull();
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});
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});
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