Add unit tests for SearchRxivExporter

Author: LoayTarek5

jablib/src/test/java/org/jabref/logic/exporter/SearchRxivExporterTest.java

@@ -34,19 +34,14 @@ private Study buildStudy() {
     void exportCreatesOneFilePerQueryAndDatabase(@TempDir Path tempDir) throws Exception {
         exporter.export(buildStudy(), tempDir);
 
-        try (var files = Files.list(tempDir)) {
-            assertEquals(1, files.count());
-        }
+        assertEquals(1, Files.list(tempDir).count());
     }
 
     @Test
     void exportedJsonContainsCorrectFields(@TempDir Path tempDir) throws Exception {
         exporter.export(buildStudy(), tempDir);
 
-        Path file;
-        try (var files = Files.list(tempDir)) {
-            file = files.findFirst().orElseThrow();
-        }
+        Path file = Files.list(tempDir).findFirst().orElseThrow();
         String content = Files.readString(file);
         ObjectMapper mapper = new ObjectMapper();
         JsonNode root = mapper.readTree(content);
@@ -71,8 +66,6 @@ void exportCreatesMultipleFilesForMultipleDatabases(@TempDir Path tempDir) throw
 
         exporter.export(study, tempDir);
 
-        try (var files = Files.list(tempDir)) {
-            assertEquals(2, files.count());
-        }
+        assertEquals(2, Files.list(tempDir).count());
     }
 }