import { describe, expect, it } from "vite-plus/test";import {  buildFileDiffContentVersion,  buildFileDiffIdentityKey,  buildFileDiffRenderKey,  buildPatchCacheKey,  getDiffLineStat,  getRenderablePatch,} from "./diffRendering"; describe("buildPatchCacheKey", () => {  it("normalizes outer whitespace before hashing", () => {    const patch = "diff --git a/a.ts b/a.ts\n+console.log('hello')";     expect(buildPatchCacheKey(`\n${patch}\n`)).toBe(buildPatchCacheKey(patch));  });   it("changes when diff content changes", () => {    const before = "diff --git a/a.ts b/a.ts\n+console.log('hello')";    const after = "diff --git a/a.ts b/a.ts\n+console.log('hello world')";     expect(buildPatchCacheKey(before)).not.toBe(buildPatchCacheKey(after));  });   it("changes when cache scope changes", () => {    const patch = "diff --git a/a.ts b/a.ts\n+console.log('hello')";     expect(buildPatchCacheKey(patch, "diff-panel:light")).not.toBe(      buildPatchCacheKey(patch, "diff-panel:dark"),    );  });}); describe("getRenderablePatch", () => {  it("compacts partial hunk render offsets for virtualized review diffs", () => {    const patch = [      "diff --git a/example.ts b/example.ts",      "index 1111111..2222222 100644",      "--- a/example.ts",      "+++ b/example.ts",      "@@ -48,4 +48,4 @@",      " context",      "-before",      "+after",      " context",      " context",      "@@ -80,3 +80,4 @@",      " context",      "+added",      " context",      " context",    ].join("\n");     const parsed = getRenderablePatch(patch, "review", {      compactPartialHunkOffsets: true,    });    expect(parsed?.kind).toBe("files");    if (parsed?.kind !== "files") return;     const file = parsed.files[0];    expect(file?.hunks[0]?.collapsedBefore).toBe(47);    expect(file?.hunks[0]?.unifiedLineStart).toBe(0);    expect(file?.hunks[1]?.collapsedBefore).toBeGreaterThan(0);    expect(file?.hunks[1]?.unifiedLineStart).toBe(file?.hunks[0]?.unifiedLineCount);    expect(file?.unifiedLineCount).toBe(      file?.hunks.reduce((total, hunk) => total + hunk.unifiedLineCount, 0),    );  });   it("retains source-file offsets for checkpoint diffs", () => {    const patch = [      "diff --git a/example.ts b/example.ts",      "--- a/example.ts",      "+++ b/example.ts",      "@@ -48,1 +48,1 @@",      "-before",      "+after",    ].join("\n");     const parsed = getRenderablePatch(patch, "checkpoint");    expect(parsed?.kind).toBe("files");    if (parsed?.kind !== "files") return;    expect(parsed.files[0]?.hunks[0]?.unifiedLineStart).toBe(47);  });}); describe("diff file reconciliation", () => {  it("keeps Pierre's render key stable when a partial diff hydrates", () => {    const patch = [      "diff --git a/example.ts b/example.ts",      "--- a/example.ts",      "+++ b/example.ts",      "@@ -1 +1 @@",      "-before",      "+after",    ].join("\n");    const parsed = getRenderablePatch(patch, "hydrated-key");    expect(parsed?.kind).toBe("files");    if (parsed?.kind !== "files") return;     const file = parsed.files[0];    expect(file).toBeDefined();    if (!file) return;    const key = buildFileDiffRenderKey(file);    file.cacheKey = `${file.cacheKey}:hydrated`;     expect(buildFileDiffRenderKey(file)).toBe(key);  });   it("keeps identities stable and versions local to the changed file", () => {    const patch = (secondLine: string) =>      [        "diff --git a/unchanged.ts b/unchanged.ts",        "--- a/unchanged.ts",        "+++ b/unchanged.ts",        "@@ -1 +1 @@",        "-before",        "+after",        "diff --git a/changed.ts b/changed.ts",        "--- a/changed.ts",        "+++ b/changed.ts",        "@@ -1 +1 @@",        "-old",        `+${secondLine}`,      ].join("\n");    const before = getRenderablePatch(patch("new"), "before");    const after = getRenderablePatch(patch("newer"), "after");    expect(before?.kind).toBe("files");    expect(after?.kind).toBe("files");    if (before?.kind !== "files" || after?.kind !== "files") return;     const [beforeUnchanged, beforeChanged] = before.files;    const [afterUnchanged, afterChanged] = after.files;    expect(beforeUnchanged).toBeDefined();    expect(beforeChanged).toBeDefined();    expect(afterUnchanged).toBeDefined();    expect(afterChanged).toBeDefined();    if (!beforeUnchanged || !beforeChanged || !afterUnchanged || !afterChanged) return;     expect(buildFileDiffIdentityKey(afterUnchanged)).toBe(      buildFileDiffIdentityKey(beforeUnchanged),    );    expect(buildFileDiffIdentityKey(afterChanged)).toBe(buildFileDiffIdentityKey(beforeChanged));    expect(buildFileDiffContentVersion(afterUnchanged)).toBe(      buildFileDiffContentVersion(beforeUnchanged),    );    expect(buildFileDiffContentVersion(afterChanged)).not.toBe(      buildFileDiffContentVersion(beforeChanged),    );  });}); describe("getDiffLineStat", () => {  it("totals additions and deletions across every file and hunk", () => {    const patch = [      "diff --git a/example.ts b/example.ts",      "--- a/example.ts",      "+++ b/example.ts",      "@@ -1,2 +1,3 @@",      "-before",      "+after",      "+added",      " context",      "@@ -10,2 +11,1 @@",      "-removed",      " context",      "diff --git a/README.md b/README.md",      "--- a/README.md",      "+++ b/README.md",      "@@ -1 +1,2 @@",      " title",      "+description",    ].join("\n");     const parsed = getRenderablePatch(patch);    expect(parsed?.kind).toBe("files");    if (parsed?.kind !== "files") return;     expect(getDiffLineStat(parsed.files)).toEqual({ additions: 3, deletions: 2 });  });});