feat: introduce JUnit5 extension (#545)

Author: lburgazzoli

Diff for: operator-framework-core/pom.xml

@@ -88,16 +88,6 @@
       <scope>test</scope>
     </dependency>
 
-    <dependency>
-      <groupId>org.apache.logging.log4j</groupId>
-      <artifactId>log4j-slf4j-impl</artifactId>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.apache.logging.log4j</groupId>
-      <artifactId>log4j-core</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>io.fabric8</groupId>
       <artifactId>kubernetes-server-mock</artifactId>

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/Operator.java

@@ -3,6 +3,7 @@
 import java.io.Closeable;
 import java.io.IOException;
 import java.net.ConnectException;
+import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.locks.ReentrantLock;
@@ -57,6 +58,10 @@ public ConfigurationService getConfigurationService() {
     return configurationService;
   }
 
+  public List<ConfiguredController> getControllers() {
+    return Collections.unmodifiableList(controllers.controllers);
+  }
+
   /**
    * Finishes the operator startup process. This is mostly used in injection-aware applications
    * where there is no obvious entrypoint to the application which can trigger the injection process
@@ -99,6 +104,8 @@ public void close() {
         "Operator SDK {} is shutting down...", configurationService.getVersion().getSdkVersion());
 
     controllers.close();
+
+    k8sClient.close();
   }
 
   /**

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/AbstractConfigurationService.java

@@ -7,14 +7,8 @@
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Stream;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 public abstract class AbstractConfigurationService implements ConfigurationService {
-
-  public static final String LOGGER_NAME = "Default ConfigurationService implementation";
-  protected static final Logger log = LoggerFactory.getLogger(LOGGER_NAME);
-
   private final Map<String, ControllerConfiguration> configurations = new ConcurrentHashMap<>();
   private final Version version;
 
@@ -60,12 +54,14 @@ public <R extends CustomResource> ControllerConfiguration<R> getConfigurationFor
     final var key = keyFor(controller);
     final var configuration = configurations.get(key);
     if (configuration == null) {
-      log.warn(
-          "Configuration for controller '{}' was not found. {}", key, getControllersNameMessage());
+      logMissingControllerWarning(key, getControllersNameMessage());
     }
     return configuration;
   }
 
+  protected abstract void logMissingControllerWarning(String controllerKey,
+      String controllersNameMessage);
+
   private String getControllersNameMessage() {
     return "Known controllers: "
         + getKnownControllerNames().stream().reduce((s, s2) -> s + ", " + s2).orElse("None")

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/BaseConfigurationService.java

@@ -0,0 +1,28 @@
+package io.javaoperatorsdk.operator.api.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class BaseConfigurationService extends AbstractConfigurationService {
+
+  private static final String LOGGER_NAME = "Default ConfigurationService implementation";
+  private static final Logger logger = LoggerFactory.getLogger(LOGGER_NAME);
+
+  public BaseConfigurationService(Version version) {
+    super(version);
+  }
+
+  @Override
+  protected void logMissingControllerWarning(String controllerKey, String controllersNameMessage) {
+    logger.warn("Configuration for controller '{}' was not found. {}", controllerKey,
+        controllersNameMessage);
+  }
+
+  public String getLoggerName() {
+    return LOGGER_NAME;
+  }
+
+  protected Logger getLogger() {
+    return logger;
+  }
+}

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/Utils.java

@@ -37,10 +37,14 @@ public static Version loadFromProperties() {
 
     Date builtTime;
     try {
-      builtTime =
-          // RFC 822 date is the default format used by git-commit-id-plugin
-          new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ")
-              .parse(properties.getProperty("git.build.time"));
+      String time = properties.getProperty("git.build.time");
+      if (time != null) {
+        builtTime =
+            // RFC 822 date is the default format used by git-commit-id-plugin
+            new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").parse(time);
+      } else {
+        builtTime = Date.from(Instant.EPOCH);
+      }
     } catch (Exception e) {
       log.debug("Couldn't parse git.build.time property", e);
       builtTime = Date.from(Instant.EPOCH);

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/Version.java

@@ -1,10 +1,13 @@
 package io.javaoperatorsdk.operator.api.config;
 
+import java.time.Instant;
 import java.util.Date;
 
 /** A class encapsulating the version information associated with this SDK instance. */
 public class Version {
 
+  public static final Version UNKNOWN = new Version("unknown", "unknown", Date.from(Instant.EPOCH));
+
   private final String sdk;
   private final String commit;
   private final Date builtTime;

Diff for: operator-framework-junit5/pom.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <parent>
+    <artifactId>java-operator-sdk</artifactId>
+    <groupId>io.javaoperatorsdk</groupId>
+    <version>1.9.7-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+
+  <artifactId>operator-framework-junit-5</artifactId>
+  <name>Operator SDK - Framework - JUnit 5 extension</name>
+
+  <properties>
+    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>io.javaoperatorsdk</groupId>
+      <artifactId>operator-framework-core</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.assertj</groupId>
+      <artifactId>assertj-core</artifactId>
+      <version>3.20.2</version>
+    </dependency>
+    <dependency>
+      <groupId>org.awaitility</groupId>
+      <artifactId>awaitility</artifactId>
+      <version>4.1.0</version>
+    </dependency>
+  </dependencies>
+
+</project>

Diff for: operator-framework-junit5/src/main/java/io/javaoperatorsdk/operator/junit/HasKubernetesClient.java

@@ -0,0 +1,7 @@
+package io.javaoperatorsdk.operator.junit;
+
+import io.fabric8.kubernetes.client.KubernetesClient;
+
+public interface HasKubernetesClient {
+  KubernetesClient getKubernetesClient();
+}

Diff for: operator-framework-junit5/src/main/java/io/javaoperatorsdk/operator/junit/KubernetesClientAware.java

@@ -0,0 +1,7 @@
+package io.javaoperatorsdk.operator.junit;
+
+import io.fabric8.kubernetes.client.KubernetesClient;
+
+public interface KubernetesClientAware extends HasKubernetesClient {
+  void setKubernetesClient(KubernetesClient kubernetesClient);
+}