Fix tests

Author: dima-dencep

.github/workflows/test-webp.yml

@@ -2,8 +2,6 @@ name: Test WebP
 
 on:
   push:
-    branches:
-      - 'main'
     paths:
       - 'webp/**'
       - '.github/workflows/test-webp.yml'
@@ -24,13 +22,16 @@ jobs:
             name: Linux (NgEngine)
             install: sudo find /usr -name 'libwebp*.so*' -exec mv {} {}.disabled \;
             expected-decode: Java (ngengine)
+            expected-encode: libwebp (lossless-only)
           - os: macos-latest
             name: macOS (ImageIO)
             expected-decode: macOS ImageIO
+            expected-encode: libwebp (lossless-only)
           - os: windows-latest
             name: Windows (WIC)
             install: winget install --id 9PG2DK419DRG --accept-package-agreements --accept-source-agreements --source msstore --silent
             expected-decode: Windows WIC
+            expected-encode: libwebp (lossless-only)
 
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}

webp/src/test/java/org/redlance/platformtools/webp/LibWebPTest.java

@@ -14,10 +14,8 @@
 
 class LibWebPTest {
     @Test
-    void encoderAvailableWithDecoder() {
-        PlatformWebPDecoder dec = LibWebPDecoder.tryCreate();
-        assumeTrue(dec != null, "libwebp not available");
-        assertNotNull(LibWebPEncoder.tryCreate(), "libwebp encoder should be available when decoder is");
+    void encoderAvailable() {
+        assertNotNull(LibWebPEncoder.tryCreate(), "libwebp encoder should be available (bundled or system)");
     }
 
     @Test
@@ -46,6 +44,18 @@ void lossyRoundtripDimensions() {
         assertEquals(original.length, decoded.argb().length);
     }
 
+    @Test
+    void bundledLosslessRoundtrip() {
+        LibWebPEncoder enc = LibWebPEncoder.tryCreate();
+        assumeTrue(enc != null, "libwebp encoder not available");
+        assumeTrue(PlatformWebPDecoder.INSTANCE.isAvailable(), "No decoder available");
+
+        int[] original = TestUtils.generateTestImage();
+        byte[] encoded = enc.encodeLossless(original, TestUtils.W, TestUtils.H);
+        DecodedImage decoded = PlatformWebPDecoder.INSTANCE.decode(encoded);
+        assertArrayEquals(original, decoded.argb(), "Lossless roundtrip pixels must match exactly");
+    }
+
     @Test
     void decodeTestFile() throws IOException {
         PlatformWebPDecoder dec = LibWebPDecoder.tryCreate();