fix(tests): replace sampletestfile.com with embedded server in HTTP tests (#15646)

The external site sampletestfile.com is down, causing DownloadTest.run()
and RequestTest.head() to fail. Use the existing Micronaut embedded
server instead, making the tests self-contained and resilient.

Author: loicmathieu

core/src/test/java/io/kestra/plugin/core/http/DownloadTest.java

@@ -22,7 +22,6 @@
 import reactor.core.publisher.FluxSink;
 
 import java.io.IOException;
-import java.net.URI;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
 
@@ -33,7 +32,8 @@
 
 @KestraTest
 class DownloadTest {
-    public static final String FILE = "https://sampletestfile.com/wp-content/uploads/2023/07/500KB-CSV.csv";
+    private static final String CSV_CONTENT = "id,name,value\n1,foo,100\n2,bar,200\n3,baz,300\n";
+
     @Inject
     private RunContextFactory runContextFactory;
 
@@ -45,10 +45,15 @@ class DownloadTest {
 
     @Test
     void run() throws Exception {
+        EmbeddedServer embeddedServer = applicationContext.getBean(EmbeddedServer.class);
+        embeddedServer.start();
+
+        String url = embeddedServer.getURI() + "/sample.csv";
+
         Download task = Download.builder()
             .id(DownloadTest.class.getSimpleName())
             .type(DownloadTest.class.getName())
-            .uri(Property.of(FILE))
+            .uri(Property.ofValue(url))
             .build();
 
         RunContext runContext = TestsUtils.mockRunContext(this.runContextFactory, task, ImmutableMap.of());
@@ -57,7 +62,7 @@ void run() throws Exception {
 
         assertThat(
             IOUtils.toString(this.storageInterface.get(null, null, output.getUri()), StandardCharsets.UTF_8),
-            is(IOUtils.toString(new URI(FILE).toURL().openStream(), StandardCharsets.UTF_8))
+            is(CSV_CONTENT)
         );
         assertThat(output.getUri().toString(), endsWith(".csv"));
     }
@@ -222,6 +227,12 @@ void contentDispositionWithDoubleDot() throws Exception {
 
     @Controller()
     public static class SlackWebController {
+        @Get("sample.csv")
+        public HttpResponse<byte[]> csv() {
+            return HttpResponse.ok(CSV_CONTENT.getBytes(StandardCharsets.UTF_8))
+                .contentType(io.micronaut.http.MediaType.TEXT_CSV_TYPE);
+        }
+
         @Get("500")
         public HttpResponse<String> error() {
             return HttpResponse.serverError();

core/src/test/java/io/kestra/plugin/core/http/RequestTest.java

@@ -74,7 +74,11 @@ void run() throws Exception {
 
     @Test
     void head() throws Exception {
-        final String url = "https://sampletestfile.com/wp-content/uploads/2023/07/500KB-CSV.csv";
+        try (
+            ApplicationContext applicationContext = ApplicationContext.run();
+            EmbeddedServer server = applicationContext.getBean(EmbeddedServer.class).start();
+        ) {
+            String url = server.getURL().toString() + "/headonly";
 
         Request task = Request.builder()
             .id(RequestTest.class.getSimpleName())
@@ -83,9 +87,9 @@ void head() throws Exception {
             .method(Property.of("HEAD"))
             .build();
 
-        RunContext runContext = TestsUtils.mockRunContext(this.runContextFactory, task, ImmutableMap.of());
+            RunContext runContext = TestsUtils.mockRunContext(this.runContextFactory, task, ImmutableMap.of());
 
-        Request.Output output = task.run(runContext);
+            Request.Output output = task.run(runContext);
 
         assertThat(output.getUri(), is(URI.create(url)));
         assertThat(output.getHeaders().get("content-length").getFirst(), is("512789"));
@@ -611,6 +615,11 @@ HttpResponse<String> head() {
             return HttpResponse.ok();
         }
 
+        @Head("/headonly")
+        HttpResponse<Void> headonly() {
+            return HttpResponse.ok();
+        }
+
         @Get("/hello417")
         HttpResponse<String> hello417() {
             return HttpResponse.status(HttpStatus.EXPECTATION_FAILED).body("{ \"hello\": \"world\" }");