Tests: add tests for decoding RGB/RGBA palette PNGs

lovell · Nov 23, 2021 · 1d4bed2 · 1d4bed2
1 parent 549219f
commit 1d4bed2
Showing 1 changed file with 39 additions and 0 deletions.
diff --git 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 });