From 1d4bed28b3da2fb8a8acf42f6c8a629adb90760b Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Tue, 23 Nov 2021 14:19:47 +0000
Subject: [PATCH] Tests: add tests for decoding RGB/RGBA palette PNGs

---
 test/unit/png.js | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/test/unit/png.js b/test/unit/png.js
index 92feb25e0..9db15854e 100644
--- a/test/unit/png.js
+++ b/test/unit/png.js
@@ -128,6 +128,45 @@ describe('PNG', function () {
     assert.strictEqual(alphaMeanAfter, alphaMeanBefore);
   });
 
+  it('RGB palette PNG decode', async () => {
+    const rgb = await sharp(fixtures.inputJpg)
+      .resize(8, 8)
+      .png({ palette: true })
+      .toBuffer();
+
+    const { info } = await sharp(rgb)
+      .toBuffer({ resolveWithObject: true });
+    const { size, ...infoWithoutSize } = info;
+
+    assert.deepStrictEqual(infoWithoutSize, {
+      format: 'png',
+      width: 8,
+      height: 8,
+      channels: 3,
+      premultiplied: false
+    });
+  });
+
+  it('RGBA palette PNG decode', async () => {
+    const rgba = await sharp(fixtures.inputJpg)
+      .resize(8, 8)
+      .ensureAlpha(0.5)
+      .png({ palette: true })
+      .toBuffer();
+
+    const { info } = await sharp(rgba)
+      .toBuffer({ resolveWithObject: true });
+    const { size, ...infoWithoutSize } = info;
+
+    assert.deepStrictEqual(infoWithoutSize, {
+      format: 'png',
+      width: 8,
+      height: 8,
+      channels: 4,
+      premultiplied: false
+    });
+  });
+
   it('Valid PNG libimagequant palette value does not throw error', function () {
     assert.doesNotThrow(function () {
       sharp().png({ palette: false });