Add basic end-to-end test

.github/workflows/gradle.yml

@@ -98,3 +98,55 @@ jobs:
           echo "- [$filename]($url)" >> $GITHUB_STEP_SUMMARY
         done
         echo "</details>" >> $GITHUB_STEP_SUMMARY
+
+    - name: Run the mod and take screenshots
+      uses: modmuss50/xvfb-action@c56c7da0c8fc9a7cb5df2e50dd2a43a80b64c5cb
+      with:
+        run: ./gradlew runEndToEndTest --stacktrace --warning-mode=fail
+
+    # Needed because the screenshot gallery won't be created on pull requests.
+    # Also useful if Imgur uploads fail.
+    - name: Upload Test Screenshots.zip artifact
+      uses: actions/upload-artifact@v4
+      if: always()
+      with:
+        name: Test Screenshots
+        path: run/screenshots
+
+    - name: Create test screenshot gallery
+      if: ${{ env.IMGUR_CLIENT_ID && (success() || failure()) }}
+      # Imgur uploads randomly fail sometimes, probably because of the low rate limit.
+      # TODO: Find a better place to upload the screenshots.
+      continue-on-error: true
+      run: |
+        echo "<details open>" >> $GITHUB_STEP_SUMMARY
+        echo "<summary>📸 Test Screenshots</summary>" >> $GITHUB_STEP_SUMMARY
+        echo "" >> $GITHUB_STEP_SUMMARY
+
+        for img in run/screenshots/*.png; do
+          if [ -f "$img" ]; then
+            filename=$(basename "$img")
+            name_without_ext="${filename%.*}"
+
+            # Upload to Imgur
+            response=$(curl -s -X POST \
+              -H "Authorization: Client-ID $IMGUR_CLIENT_ID" \
+              -F "image=@$img" \
+              https://api.imgur.com/3/image)
+
+            # Extract the URL from the response
+            url=$(echo $response | grep -o '"link":"[^"]*"' | cut -d'"' -f4)
+
+            if [ ! -z "$url" ]; then
+              # Convert underscores to spaces and capitalize first letter of each word
+              title=$(echo "$name_without_ext" | tr '_' ' ' | awk '{for(i=1;i<=NF;i++)sub(/./,toupper(substr($i,1,1)),$i)}1')
+              echo "### $title" >> $GITHUB_STEP_SUMMARY
+              echo "![${name_without_ext}]($url)" >> $GITHUB_STEP_SUMMARY
+              echo "" >> $GITHUB_STEP_SUMMARY
+            else
+              echo "Failed to upload $filename" >> $GITHUB_STEP_SUMMARY
+              echo "Imgur upload response for $filename: $response"
+            fi
+          fi
+        done
+        echo "</details>" >> $GITHUB_STEP_SUMMARY

build.gradle

@@ -37,6 +37,55 @@ dependencies {
 	modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
 }
 
+loom {
+	accessWidenerPath = file("src/main/resources/wi-zoom.accesswidener")
+}
+
+configurations {
+	productionRuntime {
+		extendsFrom configurations.minecraftLibraries
+		extendsFrom configurations.loaderLibraries
+		extendsFrom configurations.minecraftRuntimeLibraries
+	}
+}
+
+dependencies {
+	productionRuntime "net.fabricmc:fabric-loader:${project.loader_version}"
+	productionRuntime "net.fabricmc:intermediary:${project.minecraft_version}"
+}
+
+import net.fabricmc.loom.util.Platform
+tasks.register('runEndToEndTest', JavaExec) {
+	dependsOn remapJar, downloadAssets
+	classpath.from configurations.productionRuntime
+	mainClass = "net.fabricmc.loader.impl.launch.knot.KnotClient"
+	workingDir = file("run")
+
+	doFirst {
+		classpath.from loom.minecraftProvider.minecraftClientJar
+		workingDir.mkdirs()
+
+		args(
+			"--assetIndex", loom.minecraftProvider.versionInfo.assetIndex().fabricId(loom.minecraftProvider.minecraftVersion()),
+			"--assetsDir", new File(loom.files.userCache, "assets").absolutePath,
+			"--gameDir", workingDir.absolutePath
+		)
+
+		if (Platform.CURRENT.operatingSystem.isMacOS()) {
+			jvmArgs("-XstartOnFirstThread")
+		}
+
+		jvmArgs(
+			"-Dfabric.addMods=${configurations.modImplementation.find { it.name.contains('fabric-api') }.absolutePath}${File.pathSeparator}${remapJar.archiveFile.get().asFile.absolutePath}",
+			"-Dwi_zoom.e2eTest",
+			"-Dfabric-tag-conventions-v2.missingTagTranslationWarning=fail",
+			"-Dfabric-tag-conventions-v1.legacyTagWarning=fail",
+			"-Dmixin.debug.verify=true",
+			"-Dmixin.debug.countInjections=true"
+		)
+	}
+}
+
 processResources {
 	inputs.property "version", project.version