SONARKT-629 Fix SonarQube Cloud startup

Author: Godin

sonar-kotlin-plugin/src/main/java/org/sonarsource/kotlin/plugin/KotlinPlugin.kt

@@ -16,6 +16,7 @@
  */
 package org.sonarsource.kotlin.plugin
 
+import com.sonarsource.plugins.kotlin.api.KotlinPluginExtensionsProvider
 import org.sonar.api.Plugin
 import org.sonar.api.SonarProduct
 import org.sonar.api.config.PropertyDefinition
@@ -33,7 +34,7 @@ import org.sonarsource.kotlin.surefire.KotlinResourcesLocator
 import org.sonarsource.kotlin.surefire.KotlinSurefireParser
 import org.sonarsource.kotlin.surefire.KotlinSurefireSensor
 
-class KotlinPlugin : Plugin {
+class KotlinPlugin : Plugin, KotlinPluginExtensionsProvider {
 
     companion object {
         // Subcategories
@@ -108,4 +109,8 @@ class KotlinPlugin : Plugin {
             )
         }
     }
+
+    override fun registerKotlinPluginExtensions(extensions: KotlinPluginExtensionsProvider.Extensions) {
+        // nothing to do
+    }
 }

sonar-kotlin-plugin/src/test/java/org/sonarsource/kotlin/plugin/KotlinPluginTest.kt

@@ -16,6 +16,7 @@
  */
 package org.sonarsource.kotlin.plugin
 
+import com.sonarsource.plugins.kotlin.api.KotlinPluginExtensionsProvider
 import org.assertj.core.api.Assertions
 import org.junit.jupiter.api.Test
 import org.sonar.api.Plugin
@@ -27,11 +28,18 @@ import org.sonar.api.internal.SonarRuntimeImpl
 import org.sonar.api.utils.Version
 import kotlin.time.ExperimentalTime
 import org.sonar.api.config.Configuration
-import org.sonarsource.kotlin.gradle.GRADLE_PROJECT_ROOT_PROPERTY
 import java.util.Optional
 
 @ExperimentalTime
 internal class KotlinPluginTest {
+
+    @Test
+    fun `should implement KotlinPluginExtensionsProvider`() {
+        Assertions.assertThat(KotlinPlugin::class.java.interfaces)
+            .describedAs("To please dependency injection framework of SonarQube Cloud")
+            .contains(KotlinPluginExtensionsProvider::class.java)
+    }
+
     @Test
     fun testSonarQube() {
         testSonarQube(19)