#24 - provide test checking completion available for Generic Text editor

Signed-off-by: Aurélien Pupier <[email protected]>

Author: apupier

com.github.camel-tooling.lsp.eclipse.client.tests.integration/META-INF/MANIFEST.MF

@@ -10,7 +10,9 @@ Require-Bundle: org.junit;bundle-version="4.12.0",
  org.assertj;bundle-version="1.7.1",
  org.eclipse.lsp4e;bundle-version="0.3.0",
  com.github.camel-tooling.eclipse.client;bundle-version="1.0.0",
+ org.eclipse.jface.text;bundle-version="3.12.0",
  org.eclipse.ui.ide;bundle-version="3.13.1",
  org.eclipse.core.resources;bundle-version="3.12.0",
  org.eclipse.core.runtime;bundle-version="3.13.0",
- org.eclipse.ui.genericeditor;bundle-version="1.0.1"
+ org.eclipse.ui.genericeditor;bundle-version="1.0.1",
+ org.eclipse.ui.workbench.texteditor;bundle-version="3.10.100"

com.github.camel-tooling.lsp.eclipse.client.tests.integration/src/main/java/com/github/cameltooling/eclipse/client/tests/integration/CamelLSPLoadedByExtensionPointIT.java

@@ -17,24 +17,35 @@
 package com.github.cameltooling.eclipse.client.tests.integration;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.fail;
 
 import java.io.ByteArrayInputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.stream.Stream;
 
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IWorkspaceRoot;
 import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.jface.text.ITextViewer;
+import org.eclipse.jface.text.contentassist.ICompletionProposal;
+import org.eclipse.lsp4e.operations.completion.LSContentAssistProcessor;
 import org.eclipse.ui.IEditorPart;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.ide.IDE;
 import org.eclipse.ui.internal.genericeditor.ExtensionBasedTextEditor;
+import org.eclipse.ui.texteditor.AbstractTextEditor;
+import org.eclipse.ui.texteditor.ITextEditor;
 import org.junit.Test;
 
 public class CamelLSPLoadedByExtensionPointIT {
 
+	private static final int ARBITRARY_NUMBER_OF_MINIMAL_CAMEL_COMPONENTS = 200;
+
 	@Test
-	public void testGenericEditorCanOpenCamelFile() throws Exception {
+	public void testGenericEditorProvideCompletion() throws Exception {
 		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
 		IProject project = root.getProject(CamelLSPLoadedByExtensionPointIT.class.getSimpleName());
 		project.create(null);
@@ -43,6 +54,42 @@ public void testGenericEditorCanOpenCamelFile() throws Exception {
 		camelFile.create(new ByteArrayInputStream("<from uri=\"\" xmlns=\"http://camel.apache.org/schema/spring\"></from>\n".getBytes()), IResource.FORCE, null);
 		IEditorPart openEditor = IDE.openEditor(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage(), camelFile, "org.eclipse.ui.genericeditor.GenericEditor");
 		assertThat(openEditor).isInstanceOf(ExtensionBasedTextEditor.class);
+		
+		ITextViewer textViewer = getTextViewer(openEditor);
+		
+		ICompletionProposal[] proposals = new LSContentAssistProcessor().computeCompletionProposals(textViewer, 11);
+		assertThat(proposals.length).isGreaterThan(ARBITRARY_NUMBER_OF_MINIMAL_CAMEL_COMPONENTS);
+		checkContainsATimerProposal(proposals);
+	}
+
+	private void checkContainsATimerProposal(ICompletionProposal[] proposals) {
+		assertThat(Stream.of(proposals)
+			.map(ICompletionProposal::getDisplayString)
+			.filter(displayString -> displayString.contains("timer"))
+			.findFirst().get()).isNotNull();
+	}
+	
+	/**
+	 * Retrieve the TextViewer by reflection on a protected method as it is not publicly available.
+	 * it is used also by LSP4E Tests org.eclipse.lsp4e.test.TestUtils.getTextViewer(IEditorPart)
+	 * Unfortunately, the code  cannot be reused as it is in a fragment.
+	 */
+	public ITextViewer getTextViewer(IEditorPart part) throws InvocationTargetException {
+		try {			
+			if (part instanceof ITextEditor) {
+				ITextEditor textEditor = (ITextEditor) part;
+
+				Method getSourceViewerMethod = AbstractTextEditor.class.getDeclaredMethod("getSourceViewer"); //$NON-NLS-1$
+				getSourceViewerMethod.setAccessible(true);
+				return (ITextViewer) getSourceViewerMethod.invoke(textEditor);
+			} else {
+				fail("Unable to open editor");
+				return null;
+			}
+		} catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException
+				| InvocationTargetException e) {
+			throw new InvocationTargetException(e);
+		}
 	}
 
 }