Skip empty publishDiagnostics on didClose when client supports pull diagnostics

src/main/java/com/github/_1c_syntax/bsl/languageserver/BSLTextDocumentService.java

@@ -539,7 +539,9 @@ public void didClose(DidCloseTextDocumentParams params) {
 
     context.closeDocument(documentContext);
 
-    diagnosticProvider.publishEmptyDiagnosticList(documentContext);
+    if (!clientSupportsPullDiagnostics) {
+      diagnosticProvider.publishEmptyDiagnosticList(documentContext);
+    }
   }
 
   @Override

src/test/java/com/github/_1c_syntax/bsl/languageserver/BSLTextDocumentServiceTest.java

@@ -23,10 +23,13 @@
 
 import com.github._1c_syntax.bsl.languageserver.context.ServerContext;
 import com.github._1c_syntax.bsl.languageserver.jsonrpc.DiagnosticParams;
+import com.github._1c_syntax.bsl.languageserver.providers.DiagnosticProvider;
 import com.github._1c_syntax.bsl.languageserver.util.CleanupContextBeforeClassAndAfterClass;
 import com.github._1c_syntax.bsl.languageserver.utils.Ranges;
 import com.github._1c_syntax.utils.Absolute;
 import org.apache.commons.io.FileUtils;
+import org.eclipse.lsp4j.ClientCapabilities;
+import org.eclipse.lsp4j.DiagnosticCapabilities;
 import org.eclipse.lsp4j.DidChangeTextDocumentParams;
 import org.eclipse.lsp4j.DidCloseTextDocumentParams;
 import org.eclipse.lsp4j.DidOpenTextDocumentParams;
@@ -36,6 +39,7 @@
 import org.eclipse.lsp4j.Position;
 import org.eclipse.lsp4j.PrepareRenameParams;
 import org.eclipse.lsp4j.RenameParams;
+import org.eclipse.lsp4j.TextDocumentClientCapabilities;
 import org.eclipse.lsp4j.TextDocumentContentChangeEvent;
 import org.eclipse.lsp4j.TextDocumentIdentifier;
 import org.eclipse.lsp4j.TextDocumentItem;
@@ -51,10 +55,16 @@
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 import java.util.concurrent.ExecutionException;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.awaitility.Awaitility.await;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.clearInvocations;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
 
 @SpringBootTest
 @CleanupContextBeforeClassAndAfterClass
@@ -64,6 +74,11 @@ class BSLTextDocumentServiceTest {
   private BSLTextDocumentService textDocumentService;
   @MockitoSpyBean
   private ServerContext serverContext;
+  @MockitoSpyBean
+  private DiagnosticProvider diagnosticProvider;
+  @MockitoSpyBean
+  private ClientCapabilitiesHolder clientCapabilitiesHolder;
+
 
   @Test
   void didOpen() throws IOException {
@@ -186,6 +201,58 @@ void didClose() {
     textDocumentService.didClose(params);
   }
 
+  @Test
+  void didClosePublishesEmptyDiagnosticsWhenClientDoesNotSupportPullDiagnostics() throws IOException {
+    // given - open a document
+    var textDocumentItem = getTextDocumentItem();
+    var didOpenParams = new DidOpenTextDocumentParams(textDocumentItem);
+    textDocumentService.didOpen(didOpenParams);
+
+    // Simulate client without pull diagnostics support
+    var capabilities = new ClientCapabilities();
+    // No TextDocumentClientCapabilities.diagnostic set
+    when(clientCapabilitiesHolder.getCapabilities()).thenReturn(Optional.of(capabilities));
+    textDocumentService.handleInitializeEvent(null);
+
+    // Clear any invocations from didOpen
+    clearInvocations(diagnosticProvider);
+
+    // when
+    var closeParams = new DidCloseTextDocumentParams();
+    closeParams.setTextDocument(new TextDocumentIdentifier(textDocumentItem.getUri()));
+    textDocumentService.didClose(closeParams);
+
+    // then - publishEmptyDiagnosticList should be called
+    verify(diagnosticProvider).publishEmptyDiagnosticList(any());
+  }
+
+  @Test
+  void didCloseDoesNotPublishEmptyDiagnosticsWhenClientSupportsPullDiagnostics() throws IOException {
+    // given - open a document
+    var textDocumentItem = getTextDocumentItem();
+    var didOpenParams = new DidOpenTextDocumentParams(textDocumentItem);
+    textDocumentService.didOpen(didOpenParams);
+
+    // Simulate client with pull diagnostics support
+    var capabilities = new ClientCapabilities();
+    var textDocumentCapabilities = new TextDocumentClientCapabilities();
+    textDocumentCapabilities.setDiagnostic(new DiagnosticCapabilities());
+    capabilities.setTextDocument(textDocumentCapabilities);
+    when(clientCapabilitiesHolder.getCapabilities()).thenReturn(Optional.of(capabilities));
+    textDocumentService.handleInitializeEvent(null);
+
+    // Clear any invocations from didOpen
+    clearInvocations(diagnosticProvider);
+
+    // when
+    var closeParams = new DidCloseTextDocumentParams();
+    closeParams.setTextDocument(new TextDocumentIdentifier(textDocumentItem.getUri()));
+    textDocumentService.didClose(closeParams);
+
+    // then - publishEmptyDiagnosticList should NOT be called
+    verify(diagnosticProvider, never()).publishEmptyDiagnosticList(any());
+  }
+
   @Test
   void didSave() {
     DidSaveTextDocumentParams params = new DidSaveTextDocumentParams();