diff --git a/plugins/clang/tests/test_duchain.cpp b/plugins/clang/tests/test_duchain.cpp
--- a/plugins/clang/tests/test_duchain.cpp
+++ b/plugins/clang/tests/test_duchain.cpp
@@ -982,22 +982,32 @@
     auto documentController = ICore::self()->documentController();
 
     // open first document (no activation)
-    auto doc = documentController->openDocument(file1.url().toUrl(), KTextEditor::Range::invalid(), {IDocumentController::DoNotActivate});
-    QVERIFY(doc);
+    auto doc1 = documentController->openDocument(file1.url().toUrl(), KTextEditor::Range::invalid(), {IDocumentController::DoNotActivate});
+    QVERIFY(doc1);
     QVERIFY(backgroundParser->isQueued(file1.url()));
     QCOMPARE(backgroundParser->priorityForDocument(file1.url()), (int)BackgroundParser::NormalPriority);
 
     // open second document, activate
-    doc = documentController->openDocument(file2.url().toUrl());
-    QVERIFY(doc);
+    auto doc2 = documentController->openDocument(file2.url().toUrl());
+    QVERIFY(doc2);
     QVERIFY(backgroundParser->isQueued(file2.url()));
     QCOMPARE(backgroundParser->priorityForDocument(file2.url()), (int)BackgroundParser::BestPriority);
 
     // open third document, activate, too
-    doc = documentController->openDocument(file3.url().toUrl());
-    QVERIFY(doc);
+    auto doc3 = documentController->openDocument(file3.url().toUrl());
+    QVERIFY(doc3);
     QVERIFY(backgroundParser->isQueued(file3.url()));
     QCOMPARE(backgroundParser->priorityForDocument(file3.url()), (int)BackgroundParser::BestPriority);
+    
+    // Wait for the parsing to finish to avoid errors like "error: error reading '/tmp/testfile_SD1554.cpp'"
+    // due to the TestFiles getting removed.
+    file1.parseAndWait();
+    file2.parseAndWait();
+    file3.parseAndWait();
+    
+    doc1->close(KDevelop::IDocument::Discard);
+    doc2->close(KDevelop::IDocument::Discard);
+    doc3->close(KDevelop::IDocument::Discard);
 }
 
 void TestDUChain::testSystemIncludes()