Added a simple auto test for the name lookup.

tests/auto/cplusplus/cplusplus.pro

@@ -1,3 +1,3 @@
 TEMPLATE = subdirs
-SUBDIRS = shared ast semantic
+SUBDIRS = shared ast semantic lookup
 CONFIG += ordered

tests/auto/cplusplus/lookup/lookup.pro

@@ -0,0 +1,4 @@
+load(qttest_p4)
+include(../../../../src/libs/cplusplus/cplusplus-lib.pri)
+
+SOURCES += tst_lookup.cpp

tests/auto/cplusplus/lookup/tst_lookup.cpp

@@ -0,0 +1,56 @@
+
+#include <QtTest>
+#include <QObject>
+#include <CppDocument.h>
+#include <LookupContext.h>
+#include <Symbols.h>
+#include <Overview.h>
+
+CPLUSPLUS_USE_NAMESPACE
+
+class tst_Lookup: public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void base_class_defined_1();
+};
+
+void tst_Lookup::base_class_defined_1()
+{
+    Overview overview;
+
+    const QByteArray source = "\n"
+        "class base {};\n"
+        "class derived: public base {};\n";
+
+    Document::Ptr doc = Document::create("base_class_defined_1");
+    doc->setSource(source);
+    doc->parse();
+    doc->check();
+
+    QVERIFY(doc->diagnosticMessages().isEmpty());
+    QCOMPARE(doc->globalSymbolCount(), 2U);
+
+    Snapshot snapshot;
+    snapshot.insert(doc->fileName(), doc);
+
+    Document::Ptr emptyDoc = Document::create("empty");
+
+    Class *baseClass = doc->globalSymbolAt(0)->asClass();
+    QVERIFY(baseClass);
+
+    Class *derivedClass = doc->globalSymbolAt(1)->asClass();
+    QVERIFY(derivedClass);
+
+    LookupContext ctx(derivedClass, emptyDoc, doc, snapshot);
+
+    const QList<Symbol *> candidates =
+        ctx.resolveClass(derivedClass->baseClassAt(0)->name());
+
+    QCOMPARE(candidates.size(), 1);
+    QCOMPARE(candidates.at(0), baseClass);
+}
+
+QTEST_APPLESS_MAIN(tst_Lookup)
+#include "tst_lookup.moc"