Fix serverAuthenticationToken being required for configuration via CasC

pom.xml

@@ -237,6 +237,26 @@
       <version>1.2.7</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>io.jenkins</groupId>
+      <artifactId>configuration-as-code</artifactId>
+      <version>1.31</version>
+      <scope>test</scope>
+      <!-- TODO: remove after configuration-as-code 1.32 is released -->
+      <exclusions>
+        <exclusion>
+          <groupId>commons-beanutils</groupId>
+          <artifactId>commons-beanutils</artifactId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>io.jenkins</groupId>
+      <artifactId>configuration-as-code</artifactId>
+      <version>1.31</version>
+      <classifier>tests</classifier>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <repositories>

src/main/java/hudson/plugins/sonar/SonarInstallation.java

@@ -84,11 +84,11 @@ public SonarInstallation(String name,
   public SonarInstallation(
     String name,
     String serverUrl,
-    @Nullable String credentialsId,
-    @Nullable Secret serverAuthenticationToken,
-    String mojoVersion,
-    String additionalProperties,
-    String additionalAnalysisProperties,
+    @CheckForNull String credentialsId,
+    @CheckForNull Secret serverAuthenticationToken,
+    @CheckForNull String mojoVersion,
+    @CheckForNull String additionalProperties,
+    @CheckForNull String additionalAnalysisProperties,
     TriggersConfig triggers) {
     this.name = name;
     this.serverUrl = serverUrl;

src/main/java/hudson/plugins/sonar/model/TriggersConfig.java

@@ -35,6 +35,8 @@
 import java.util.List;
 import org.kohsuke.stapler.DataBoundConstructor;
 
+import javax.annotation.CheckForNull;
+
 /**
  * @author Evgeny Mandrikov
  * @since 1.2
@@ -59,7 +61,7 @@ public TriggersConfig() {
   }
 
   @DataBoundConstructor
-  public TriggersConfig(boolean skipScmCause, boolean skipUpstreamCause, String envVar) {
+  public TriggersConfig(boolean skipScmCause, boolean skipUpstreamCause, @CheckForNull String envVar) {
     this.skipScmCause = skipScmCause;
     this.skipUpstreamCause = skipUpstreamCause;
     this.envVar = envVar;

src/test/java/hudson/plugins/sonar/casc/CasCTest.java

@@ -0,0 +1,44 @@
+/*
+ * SonarQube Scanner for Jenkins
+ * Copyright (C) 2007-2019 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+package hudson.plugins.sonar.casc;
+
+import hudson.plugins.sonar.SonarGlobalConfiguration;
+import hudson.plugins.sonar.SonarInstallation;
+import io.jenkins.plugins.casc.misc.RoundTripAbstractTest;
+import jenkins.model.GlobalConfiguration;
+import org.jvnet.hudson.test.RestartableJenkinsRule;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class CasCTest extends RoundTripAbstractTest {
+
+    @Override
+    protected void assertConfiguredAsExpected(RestartableJenkinsRule restartableJenkinsRule, String s) {
+        SonarInstallation installation = GlobalConfiguration.all()
+                .get(SonarGlobalConfiguration.class)
+                .getInstallations()[0];
+        assertThat(installation).isNotNull();
+    }
+
+    @Override
+    protected String stringInLogExpected() {
+        return "credentialsId = test-id";
+    }
+}

src/test/resources/hudson/plugins/sonar/casc/configuration-as-code.yaml

@@ -0,0 +1,10 @@
+unclassified:
+  sonarglobalconfiguration:
+    buildWrapperEnabled: true
+    installations:
+      - name: "TEST"
+        credentialsId: "test-id"
+        serverUrl: "http://url:9000"
+        triggers:
+          skipScmCause: true
+          skipUpstreamCause: true