fix: Fix Android test compilation issues

- Add missing package declaration to ExtractorTests.kt
- Move test file to proper Kotlin directory structure
- Add test source directory configuration to build.gradle
- Add missing test dependencies (kotlin-test, mockito-core)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ened

example/pubspec.yaml

@@ -19,6 +19,7 @@ dev_dependencies:
     sdk: flutter
   flutter_test:
     sdk: flutter
+  flutter_lints: ^6.0.0
 
 flutter:
   uses-material-design: true

workmanager_android/android/build.gradle

@@ -19,6 +19,7 @@ android {
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
+        test.java.srcDirs += 'src/test/kotlin'
     }
     defaultConfig {
         compileSdk 35
@@ -47,4 +48,6 @@ dependencies {
     implementation "androidx.concurrent:concurrent-futures:1.1.0"
 
     testImplementation 'junit:junit:4.13.2'
+    testImplementation "org.jetbrains.kotlin:kotlin-test"
+    testImplementation "org.mockito:mockito-core:5.0.0"
 }

…/android/src/test/java/ExtractorTests.kt …rcommunity/workmanager/ExtractorTests.ktworkmanager_android/android/src/test/java/ExtractorTests.kt renamed to workmanager_android/android/src/test/kotlin/dev/fluttercommunity/workmanager/ExtractorTests.kt workmanager_android/android/src/test/java/ExtractorTests.kt renamed to workmanager_android/android/src/test/kotlin/dev/fluttercommunity/workmanager/ExtractorTests.kt

@@ -1,3 +1,5 @@
+package dev.fluttercommunity.workmanager
+
 import androidx.work.NetworkType
 import androidx.work.OutOfQuotaPolicy
 import dev.fluttercommunity.workmanager.Extractor