Pass app model location to Maven test process

Otherwise it doesn't actually use the app model stored in that location
and instead tries to recreate it from the Maven POM files.

Author: oehme

devtools/maven/src/main/java/io/quarkus/maven/GenerateCodeMojo.java

@@ -9,14 +9,14 @@
 import java.util.function.Consumer;
 import java.util.stream.Collectors;
 
-import io.quarkus.bootstrap.BootstrapConstants;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.plugins.annotations.ResolutionScope;
 
+import io.quarkus.bootstrap.BootstrapConstants;
 import io.quarkus.bootstrap.app.ApplicationModelSerializer;
 import io.quarkus.bootstrap.app.CuratedApplication;
 import io.quarkus.bootstrap.classloading.QuarkusClassLoader;
@@ -119,11 +119,16 @@ void generateCode(PathCollection sourceParents, Consumer<Path> sourceRegistrar,
                                     .getSerializedTestAppModelPath(Path.of(mavenProject().getBuild().getDirectory()));
                             ApplicationModelSerializer.serialize(appModel, serializedTestAppModelPath);
 
+                            Properties properties = mavenProject().getProperties();
+                            String argLine = properties.getProperty("argLine", "");
+                            properties.setProperty("argLine", argLine +
+                                    " -D" + BootstrapConstants.SERIALIZED_TEST_APP_MODEL + "=" + serializedTestAppModelPath);
+
                             String deployClasspath = appModel.getDependencies().stream()
                                     .flatMap(dep -> dep.getResolvedPaths().stream())
                                     .map(Path::toString)
                                     .collect(Collectors.joining(File.pathSeparator));
-                            mavenProject().getProperties().setProperty("quarkus.test.deploy.classpath", deployClasspath);
+                            properties.setProperty("quarkus.test.deploy.classpath", deployClasspath);
                         } catch (IOException e) {
                             getLog().warn("Failed to serialize application model", e);
                         }