test: add test to ensure additionalRequestArgs are generated when length > 0

fix: adjust api.qute to correctly handle commas when using additionalRequestArgs and dynamic url

Updated the `api.qute` template to handle this safely, without affecting
other parameter combinations.

Author: dellamas

client/deployment/src/main/resources/templates/libraries/microprofile/api.qute

@@ -123,15 +123,13 @@ public interface {classname} {
                 {/if}
             {/if}
         {/if}
-        {#if additionalRequestArgs}
-            {#for arg in additionalRequestArgs}
-                {arg}{#if arg_hasNext}, {/if}
-            {/for}
-            {#if is-resteasy-reactive && use-dynamic-url}, {/if}
+        {#if additionalRequestArgs && additionalRequestArgs.length > 0}
+            {#for arg in additionalRequestArgs}{arg}{#if arg_hasNext}, {/if}{/for}
+            {#if (op.allParams || op.hasFormParams)}, {/if}
         {/if}
         {#if is-resteasy-reactive && use-dynamic-url}
-        // See https://quarkus.io/version/3.20/guides/rest-client#dynamic-base-urls
-        @io.quarkus.rest.client.reactive.Url String dynUrl{#if op.allParams || op.hasFormParams},{/if}
+            // See https://quarkus.io/version/3.20/guides/rest-client#dynamic-base-urls
+            @io.quarkus.rest.client.reactive.Url String dynUrl{#if op.allParams || op.hasFormParams},{/if}
         {/if}
         {#if op.hasFormParams}
         {#if is-resteasy-reactive}

client/deployment/src/test/java/io/quarkiverse/openapi/generator/deployment/wrapper/OpenApiClientGeneratorWrapperTest.java

@@ -633,6 +633,31 @@ void verifyAdditionalRequestArgs() throws URISyntaxException {
                 .forEach(this::verifyApiAdditionalHTTPHeaders);
     }
 
+    @Test
+    void shouldGenerateAdditionalParametersWhenLengthGreaterThanZero() throws Exception {
+        List<File> generatedFiles = createGeneratorWrapper("petstore-openapi.json")
+                .withAdditionalRequestArgs("@HeaderParam(\"X-Test\") String testHeader;@PathParam(\"id\") String id")
+                .generate("org.test.additionalargs");
+
+        Optional<File> file = generatedFiles.stream()
+                .filter(f -> f.getName().endsWith("PetApi.java"))
+                .findAny();
+        assertThat(file).isNotEmpty();
+
+        CompilationUnit compilationUnit = StaticJavaParser.parse(file.orElseThrow());
+        List<MethodDeclaration> methods = compilationUnit.findAll(MethodDeclaration.class);
+
+        boolean found = methods.stream().anyMatch(m ->
+                m.getParameters().stream().anyMatch(p ->
+                        p.getNameAsString().equals("testHeader") && p.getAnnotationByName("HeaderParam").isPresent()
+                ) &&
+                        m.getParameters().stream().anyMatch(p ->
+                                p.getNameAsString().equals("id") && p.getAnnotationByName("PathParam").isPresent()
+                        )
+        );
+        assertTrue(found, "Additional parameters must be generated when additionalRequestArgs.length > 0");
+    }
+
     @Test
     void verifyCookieParams() throws URISyntaxException {
         List<File> generatedFiles = createGeneratorWrapper("petstore-openapi.json").generate("org.cookieParams");