Compile application classes before test classes

Fixes quarkusio#28376

core/deployment/src/main/java/io/quarkus/deployment/dev/RuntimeUpdatesProcessor.java

@@ -316,9 +316,9 @@ private void periodicTestCompile() {
         scanLock.lock();
         TestScanningLock.lockForTests();
         try {
-            ClassScanResult changedTestClassResult = compileTestClasses();
             ClassScanResult changedApp = checkForChangedClasses(compiler, DevModeContext.ModuleInfo::getMain, false, test,
                     true);
+            ClassScanResult changedTestClassResult = compileTestClasses();
             if (changedApp.compilationHappened) {
                 if (testCompileProblem != null) {
                     testSupport.testCompileFailed(testCompileProblem);

extensions/vertx-http/deployment/src/test/java/io/quarkus/vertx/http/testrunner/ChangeSourceAndTestAtOnceTestCase.java

@@ -0,0 +1,64 @@
+package io.quarkus.vertx.http.testrunner;
+
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.StringAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.dev.testing.TestScanningLock;
+import io.quarkus.test.ContinuousTestingTestUtils;
+import io.quarkus.test.ContinuousTestingTestUtils.TestStatus;
+import io.quarkus.test.QuarkusDevModeTest;
+
+public class ChangeSourceAndTestAtOnceTestCase {
+
+    @RegisterExtension
+    static QuarkusDevModeTest test = new QuarkusDevModeTest()
+            .setArchiveProducer(new Supplier<>() {
+                @Override
+                public JavaArchive get() {
+                    return ShrinkWrap.create(JavaArchive.class).addClasses(CoupledService.class)
+                            .add(new StringAsset(ContinuousTestingTestUtils.appProperties("quarkus.test.type=unit")),
+                                    "application.properties");
+                }
+            })
+            .setTestArchiveProducer(new Supplier<>() {
+                @Override
+                public JavaArchive get() {
+                    return ShrinkWrap.create(JavaArchive.class).addClasses(CoupledET.class);
+                }
+            });
+
+    @Test
+    public void testChangeSourceAndTestAtOnce() throws InterruptedException {
+        ContinuousTestingTestUtils utils = new ContinuousTestingTestUtils();
+        TestStatus ts = utils.waitForNextCompletion();
+        Assertions.assertEquals(1L, ts.getTestsPassed());
+        TestScanningLock.lockForTests();
+        try {
+            test.modifySourceFile(CoupledService.class, new Function<String, String>() {
+                @Override
+                public String apply(String s) {
+                    return s.replace("service", "newService");
+                }
+            });
+            test.modifyTestSourceFile(CoupledET.class, new Function<String, String>() {
+                @Override
+                public String apply(String s) {
+                    return s.replace("service", "newService");
+                }
+            });
+
+        } finally {
+            TestScanningLock.unlockForTests();
+        }
+        ts = utils.waitForNextCompletion();
+        Assertions.assertEquals(1L, ts.getTestsPassed());
+
+    }
+}

extensions/vertx-http/deployment/src/test/java/io/quarkus/vertx/http/testrunner/CoupledET.java

@@ -0,0 +1,13 @@
+package io.quarkus.vertx.http.testrunner;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class CoupledET {
+
+    @Test
+    public void unitStyleTest2() {
+        Assertions.assertEquals("unit", CoupledService.service());
+    }
+
+}

extensions/vertx-http/deployment/src/test/java/io/quarkus/vertx/http/testrunner/CoupledService.java

@@ -0,0 +1,9 @@
+package io.quarkus.vertx.http.testrunner;
+
+public class CoupledService {
+
+    public static String service() {
+        return "unit";
+    }
+
+}

test-framework/junit5-internal/src/main/java/io/quarkus/test/QuarkusDevModeTest.java

@@ -774,4 +774,16 @@ public QuarkusDevModeTest setAllowFailedStart(boolean allowFailedStart) {
         this.allowFailedStart = allowFailedStart;
         return this;
     }
+
+    static class ChangeSet {
+        final String name;
+        final Function<String, String> mutator;
+        final Path path;
+
+        ChangeSet(String name, Function<String, String> mutator, Path path) {
+            this.name = name;
+            this.mutator = mutator;
+            this.path = path;
+        }
+    }
 }