diff --git a/lib/checkclass.cpp b/lib/checkclass.cpp
index 858825746..915269f19 100644
--- a/lib/checkclass.cpp
+++ b/lib/checkclass.cpp
@@ -102,13 +102,6 @@ static bool isVariableCopyNeeded(const Variable &var, Function::Type type)
             (var.valueType() && var.valueType()->type >= ValueType::Type::CHAR));
 }
 
-static bool isVcl(const Settings *settings)
-{
-    return std::any_of(settings->libraries.cbegin(), settings->libraries.cend(), [](const std::string& library) {
-        return library == "vcl";
-    });
-}
-
 static bool isVclTypeInit(const Type *type)
 {
     if (!type)
@@ -141,7 +134,7 @@ void CheckClass::constructors()
 
     const bool printInconclusive = mSettings->certainty.isEnabled(Certainty::inconclusive);
     for (const Scope * scope : mSymbolDatabase->classAndStructScopes) {
-        if (isVcl(mSettings) && isVclTypeInit(scope->definedType))
+        if (mSettings->hasLib("vcl") && isVclTypeInit(scope->definedType))
             continue;
 
         const bool unusedTemplate = Token::simpleMatch(scope->classDef->previous(), ">");
diff --git a/lib/checkmemoryleak.cpp b/lib/checkmemoryleak.cpp
index 3942128c9..cb8560c50 100644
--- a/lib/checkmemoryleak.cpp
+++ b/lib/checkmemoryleak.cpp
@@ -116,7 +116,7 @@ CheckMemoryLeak::AllocType CheckMemoryLeak::getAllocationType(const Token *tok2,
             return New;
         }
 
-        if (mSettings_->posix()) {
+        if (mSettings_->hasLib("posix")) {
             if (Token::Match(tok2, "open|openat|creat|mkstemp|mkostemp|socket (")) {
                 // simple sanity check of function parameters..
                 // TODO: Make such check for all these functions
@@ -237,7 +237,7 @@ CheckMemoryLeak::AllocType CheckMemoryLeak::getDeallocationType(const Token *tok
                 if (tok->str() == "realloc" && Token::simpleMatch(vartok->next(), ", 0 )"))
                     return Malloc;
 
-                if (mSettings_->posix()) {
+                if (mSettings_->hasLib("posix")) {
                     if (tok->str() == "close")
                         return Fd;
                     if (tok->str() == "pclose")
@@ -276,7 +276,7 @@ bool CheckMemoryLeak::isReopenStandardStream(const Token *tok) const
 
 bool CheckMemoryLeak::isOpenDevNull(const Token *tok) const
 {
-    if (mSettings_->posix() && tok->str() == "open" && numberOfArguments(tok) == 2) {
+    if (mSettings_->hasLib("posix") && tok->str() == "open" && numberOfArguments(tok) == 2) {
         const Token* arg = getArguments(tok).at(0);
         if (Token::simpleMatch(arg, "\"/dev/null\""))
             return true;
diff --git a/lib/settings.h b/lib/settings.h
index 08f8af126..79362e4b7 100644
--- a/lib/settings.h
+++ b/lib/settings.h
@@ -417,9 +417,9 @@ public:
      */
     bool isEnabled(const ValueFlow::Value *value, bool inconclusiveCheck=false) const;
 
-    /** Is posix library specified? */
-    bool posix() const {
-        return std::find(libraries.cbegin(), libraries.cend(), "posix") != libraries.cend();
+    /** Is library specified? */
+    bool hasLib(const std::string &lib) const {
+        return std::find(libraries.cbegin(), libraries.cend(), lib) != libraries.cend();
     }
 
     /** @brief Request termination of checking */
diff --git a/test/testautovariables.cpp b/test/testautovariables.cpp
index 189f23e21..49e07ab7f 100644
--- a/test/testautovariables.cpp
+++ b/test/testautovariables.cpp
@@ -52,6 +52,7 @@ private:
         settings.severity.enable(Severity::style);
         LOAD_LIB_2(settings.library, "std.cfg");
         LOAD_LIB_2(settings.library, "qt.cfg");
+        settings.libraries.emplace_back("qt");
 
         TEST_CASE(testautovar1);
         TEST_CASE(testautovar2);
diff --git a/test/testbufferoverrun.cpp b/test/testbufferoverrun.cpp
index 8fb5d6caa..a15e5cb81 100644
--- a/test/testbufferoverrun.cpp
+++ b/test/testbufferoverrun.cpp
@@ -3528,9 +3528,7 @@ private:
                                "    <arg nr=\"2\"/>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         // Attempt to get size from Cfg files, no false positives if size is not specified
         check("void f() {\n"
@@ -4083,9 +4081,7 @@ private:
                                "    <arg nr=\"3\"/>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
         settings.severity.enable(Severity::warning);
         settings.sizeof_wchar_t = 4;
 
@@ -4225,9 +4221,7 @@ private:
                                "    <arg nr=\"3\"/>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         check("void f() {\n"
               "    char c[7];\n"
@@ -4289,9 +4283,7 @@ private:
                                "    </arg>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         // formatstr..
         check("void f() {\n"
@@ -4403,9 +4395,7 @@ private:
                                "    <arg nr=\"4\"/>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         check("void f() {\n"
               "    char c[5];\n"
@@ -5498,6 +5488,7 @@ private:
 
         Settings settings;
         LOAD_LIB_2(settings.library, "posix.cfg");
+        settings.libraries.emplace_back("posix");
 
         check("void f(){\n"
               "int pipefd[1];\n" // <--  array of two integers is needed
diff --git a/test/testclass.cpp b/test/testclass.cpp
index 74430452b..8f07f22c8 100644
--- a/test/testclass.cpp
+++ b/test/testclass.cpp
@@ -60,10 +60,8 @@ private:
                                    "    </access>\n"
                                    "  </container>\n"
                                    "</def>";
-            tinyxml2::XMLDocument doc;
-            doc.Parse(xmldata, sizeof(xmldata));
-            settings0.library.load(doc);
-            settings1.library.load(doc);
+            ASSERT(settings0.library.loadxmldata(xmldata, sizeof(xmldata)));
+            ASSERT(settings1.library.loadxmldata(xmldata, sizeof(xmldata)));
         }
 
 
@@ -3390,9 +3388,7 @@ private:
                                "  <podtype name=\"std::uint8_t\" sign=\"u\" size=\"1\"/>\n"
                                "  <podtype name=\"std::atomic_bool\"/>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         checkNoMemset("class A {\n"
                       "    std::array<int, 10> ints;\n"
diff --git a/test/testcondition.cpp b/test/testcondition.cpp
index f4813ff18..f46378a7b 100644
--- a/test/testcondition.cpp
+++ b/test/testcondition.cpp
@@ -49,6 +49,7 @@ private:
         PLATFORM(settings1, cppcheck::Platform::Native);
 
         LOAD_LIB_2(settings0.library, "qt.cfg");
+        settings0.libraries.emplace_back("qt");
         LOAD_LIB_2(settings0.library, "std.cfg");
 
         settings0.severity.enable(Severity::style);
@@ -58,11 +59,9 @@ private:
                            "<def>\n"
                            "  <function name=\"bar\"> <pure/> </function>\n"
                            "</def>";
-        tinyxml2::XMLDocument xmldoc;
-        xmldoc.Parse(cfg, sizeof(cfg));
+        ASSERT(settings1.library.loadxmldata(cfg, sizeof(cfg)));
         settings1.severity.enable(Severity::style);
         settings1.severity.enable(Severity::warning);
-        settings1.library.load(xmldoc);
 
         TEST_CASE(assignAndCompare);   // assignment and comparison don't match
         TEST_CASE(mismatchingBitAnd);  // overlapping bitmasks
diff --git a/test/testconstructors.cpp b/test/testconstructors.cpp
index 313df2d5d..7ebdd1008 100644
--- a/test/testconstructors.cpp
+++ b/test/testconstructors.cpp
@@ -1952,7 +1952,8 @@ private:
 
     void initvar_smartptr() { // #10237
         Settings s;
-        s.libraries.emplace_back("std");
+        // TODO: test shuld probably not pass without library
+        //LOAD_LIB_2(s.library, "std.cfg");
         check("struct S {\n"
               "    explicit S(const std::shared_ptr<S>& sp) {\n"
               "        set(*sp);\n"
@@ -3589,7 +3590,9 @@ private:
 
     void uninitVarInheritClassInit() {
         Settings s;
-        s.libraries.emplace_back("vcl");
+        // TODO: test should probably not pass without library
+        //LOAD_LIB_2(s.library, "vcl.cfg");
+        //s.libraries.emplace_back("vcl");
 
         check("class Fred: public TObject\n"
               "{\n"
diff --git a/test/testerrorlogger.cpp b/test/testerrorlogger.cpp
index 67aae00fd..7b7c778a1 100644
--- a/test/testerrorlogger.cpp
+++ b/test/testerrorlogger.cpp
@@ -249,7 +249,7 @@ private:
                                "  <location file=\"foo.cpp\" line=\"5\" column=\"2\"/>\n"
                                "</error>";
         tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
+        ASSERT(doc.Parse(xmldata, sizeof(xmldata)) == tinyxml2::XML_SUCCESS);
         ErrorMessage msg(doc.FirstChildElement());
         ASSERT_EQUALS("errorId", msg.id);
         ASSERT_EQUALS(Severity::error, msg.severity);
diff --git a/test/testfunctions.cpp b/test/testfunctions.cpp
index 9cccc61fd..26fefcd92 100644
--- a/test/testfunctions.cpp
+++ b/test/testfunctions.cpp
@@ -43,11 +43,11 @@ private:
         settings.severity.enable(Severity::performance);
         settings.severity.enable(Severity::portability);
         settings.certainty.enable(Certainty::inconclusive);
-        settings.libraries.emplace_back("posix");
         settings.standards.c = Standards::C11;
         settings.standards.cpp = Standards::CPP11;
         LOAD_LIB_2(settings.library, "std.cfg");
         LOAD_LIB_2(settings.library, "posix.cfg");
+        settings.libraries.emplace_back("posix");
 
         // Prohibited functions
         TEST_CASE(prohibitedFunctions_posix);
@@ -1313,9 +1313,7 @@ private:
                                "    <arg nr=\"2\"/>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings2.library.load(doc);
+        ASSERT(settings2.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         check("void foo() {\n"
               "  mystrcmp(a, b);\n"
@@ -1468,9 +1466,7 @@ private:
                                "    <arg nr=\"2\"/>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings2.library.load(doc);
+        ASSERT(settings2.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         check("void foo() {\n"
               "  mystrcmp(a, b);\n"
diff --git a/test/testio.cpp b/test/testio.cpp
index 17826b214..f72a91a06 100644
--- a/test/testio.cpp
+++ b/test/testio.cpp
@@ -39,6 +39,7 @@ private:
         LOAD_LIB_2(settings.library, "std.cfg");
         LOAD_LIB_2(settings.library, "windows.cfg");
         LOAD_LIB_2(settings.library, "qt.cfg");
+        settings.libraries.emplace_back("qt");
 
         TEST_CASE(coutCerrMisusage);
 
diff --git a/test/testleakautovar.cpp b/test/testleakautovar.cpp
index 904457471..43a3c9579 100644
--- a/test/testleakautovar.cpp
+++ b/test/testleakautovar.cpp
@@ -65,9 +65,7 @@ private:
                                "<def>\n"
                                "  <podtype name=\"uint8_t\" sign=\"u\" size=\"1\"/>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         // Assign
         TEST_CASE(assign1);
@@ -474,6 +472,7 @@ private:
     void assign23() {
         Settings s = settings;
         LOAD_LIB_2(settings.library, "posix.cfg");
+        settings.libraries.emplace_back("posix");
         check("void f() {\n"
               "    int n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11, n12, n13, n14;\n"
               "    *&n1 = open(\"xx.log\", O_RDONLY);\n"
@@ -1854,6 +1853,7 @@ private:
         Settings s;
         LOAD_LIB_2(s.library, "std.cfg");
         LOAD_LIB_2(s.library, "posix.cfg");
+        s.libraries.emplace_back("posix");
 
         check("void f() {\n"
               "    char* temp = strdup(\"temp.txt\");\n"
@@ -2594,9 +2594,7 @@ private:
                                "    </arg>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settingsFunctionCall.library.load(doc);
+        ASSERT(settingsFunctionCall.library.loadxmldata(xmldata, sizeof(xmldata)));
         check("void test_func()\n"
               "{\n"
               "    char * buf = malloc(4);\n"
@@ -2616,9 +2614,7 @@ private:
                                "    <arg nr=\"1\" direction=\"in\"/>\n"
                                "  </function>\n"
                                "</def>\n";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settingsLeakIgnore.library.load(doc);
+        ASSERT(settingsLeakIgnore.library.loadxmldata(xmldata, sizeof(xmldata)));
         check("void f() {\n"
               "    double* a = new double[1024];\n"
               "    SomeClass::someMethod(a);\n"
diff --git a/test/testlibrary.cpp b/test/testlibrary.cpp
index 1ea7e7243..ba78e1e0d 100644
--- a/test/testlibrary.cpp
+++ b/test/testlibrary.cpp
@@ -71,12 +71,6 @@ private:
         TEST_CASE(loadLibErrors);
     }
 
-    static Library::Error readLibrary(Library& library, const char* xmldata) {
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata);
-        return library.load(doc);
-    }
-
     void isCompliantValidationExpression() const {
         ASSERT_EQUALS(true, Library::isCompliantValidationExpression("-1"));
         ASSERT_EQUALS(true, Library::isCompliantValidationExpression("1"));
@@ -103,7 +97,7 @@ private:
         // Reading an empty library file is considered to be OK
         const char xmldata[] = "<?xml version=\"1.0\"?>\n<def/>";
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT(library.functions.empty());
     }
 
@@ -121,7 +115,7 @@ private:
         tokenList.front()->next()->astOperand1(tokenList.front());
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT_EQUALS(library.functions.size(), 1U);
         ASSERT(library.functions.at("foo").argumentChecks.empty());
         ASSERT(library.isnotnoreturn(tokenList.front()));
@@ -136,7 +130,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         {
             TokenList tokenList(nullptr);
             std::istringstream istr("fred.foo(123);"); // <- wrong scope, not library function
@@ -168,7 +162,7 @@ private:
         tokenList.createAst();
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT(library.isNotLibraryFunction(tokenList.front()));
     }
 
@@ -182,7 +176,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
 
         {
             TokenList tokenList(nullptr);
@@ -237,7 +231,7 @@ private:
         tokenList.front()->next()->varId(1);
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT(library.isNotLibraryFunction(tokenList.front()->next()));
     }
 
@@ -254,7 +248,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT_EQUALS(0, library.functions["foo"].argumentChecks[1].notuninit);
         ASSERT_EQUALS(true, library.functions["foo"].argumentChecks[2].notnull);
         ASSERT_EQUALS(true, library.functions["foo"].argumentChecks[3].formatstr);
@@ -273,7 +267,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT_EQUALS(0, library.functions["foo"].argumentChecks[-1].notuninit);
     }
 
@@ -287,7 +281,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT_EQUALS(0, library.functions["foo"].argumentChecks[-1].notuninit);
 
         TokenList tokenList(nullptr);
@@ -313,7 +307,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
 
         TokenList tokenList(nullptr);
         std::istringstream istr("foo(a,b,c,d);");
@@ -345,7 +339,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
 
         TokenList tokenList(nullptr);
         std::istringstream istr("foo(a,b,c,d,e,f,g,h,i,j,k);");
@@ -487,7 +481,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
 
         TokenList tokenList(nullptr);
         std::istringstream istr("foo(a,b,c,d,e);");
@@ -546,7 +540,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT_EQUALS(library.functions.size(), 2U);
         ASSERT(library.functions.at("Foo::foo").argumentChecks.empty());
         ASSERT(library.functions.at("bar").argumentChecks.empty());
@@ -575,7 +569,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT_EQUALS(library.functions.size(), 1U);
 
         {
@@ -602,7 +596,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
 
         {
             Tokenizer tokenizer(&settings, nullptr);
@@ -631,7 +625,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
 
         TokenList tokenList(nullptr);
         std::istringstream istr("a(); b();");
@@ -665,7 +659,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT(library.functions.empty());
 
         ASSERT(Library::ismemory(library.getAllocFuncInfo("CreateX")));
@@ -708,7 +702,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT(library.functions.empty());
 
         const Library::AllocFunc* af = library.getAllocFuncInfo("CreateX");
@@ -727,7 +721,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         ASSERT(library.functions.empty());
 
         ASSERT(Library::isresource(library.allocId("CreateX")));
@@ -744,7 +738,7 @@ private:
                                    "  <podtype name=\"s16\" sign=\"s\" size=\"2\"/>\n"
                                    "</def>";
             Library library;
-            ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+            ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
             // s8
             {
                 const struct Library::PodType * const type = library.podtype("s8");
@@ -822,7 +816,7 @@ private:
                                "</def>";
 
         Library library;
-        ASSERT_EQUALS(true, Library::ErrorCode::OK == (readLibrary(library, xmldata)).errorcode);
+        ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
 
         Library::Container& A = library.containers["A"];
         Library::Container& B = library.containers["B"];
@@ -937,16 +931,14 @@ private:
                                    "<def>\n"
                                    "</def>";
             Library library;
-            const Library::Error err = readLibrary(library, xmldata);
-            ASSERT_EQUALS(true, err.errorcode == Library::ErrorCode::OK);
+            ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         }
         {
             const char xmldata[] = "<?xml version=\"1.0\"?>\n"
                                    "<def format=\"1\">\n"
                                    "</def>";
             Library library;
-            const Library::Error err = readLibrary(library, xmldata);
-            ASSERT_EQUALS(true, err.errorcode == Library::ErrorCode::OK);
+            ASSERT(library.loadxmldata(xmldata, sizeof(xmldata)));
         }
         {
             const char xmldata[] = "<?xml version=\"1.0\"?>\n"
@@ -958,6 +950,12 @@ private:
         }
     }
 
+    static Library::Error readLibrary(Library& library, const char* xmldata) {
+        tinyxml2::XMLDocument doc;
+        doc.Parse(xmldata); // TODO: check result
+        return library.load(doc);
+    }
+
     void loadLibError(const char xmldata[], Library::ErrorCode errorcode, const char* file, unsigned line) const {
         Library library;
         assertEquals(file, line, true, errorcode == readLibrary(library, xmldata).errorcode);
diff --git a/test/testmemleak.cpp b/test/testmemleak.cpp
index 0fb93d8f3..a694a710b 100644
--- a/test/testmemleak.cpp
+++ b/test/testmemleak.cpp
@@ -151,6 +151,7 @@ private:
     void run() override {
         LOAD_LIB_2(settings1.library, "std.cfg");
         LOAD_LIB_2(settings1.library, "posix.cfg");
+        settings1.libraries.emplace_back("posix");
         LOAD_LIB_2(settings2.library, "std.cfg");
 
         TEST_CASE(realloc1);
@@ -1705,6 +1706,7 @@ private:
     void run() override {
         LOAD_LIB_2(settings.library, "std.cfg");
         LOAD_LIB_2(settings.library, "posix.cfg");
+        settings.libraries.emplace_back("posix");
 
         // testing that errors are detected
         TEST_CASE(err);
@@ -2291,11 +2293,11 @@ private:
 
     void run() override {
         settings.certainty.setEnabled(Certainty::inconclusive, true);
-        settings.libraries.emplace_back("posix");
         settings.severity.enable(Severity::warning);
 
         LOAD_LIB_2(settings.library, "std.cfg");
         LOAD_LIB_2(settings.library, "posix.cfg");
+        settings.libraries.emplace_back("posix");
 
         // pass allocated memory to function..
         TEST_CASE(functionParameter);
diff --git a/test/testother.cpp b/test/testother.cpp
index 9fead3abe..51dd8d801 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -5891,9 +5891,7 @@ private:
                                "    <arg nr=\"2\"/>\n"
                                "  </function>\n"
                                "</def>";
-        tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata, sizeof(xmldata));
-        settings.library.load(doc);
+        ASSERT(settings.library.loadxmldata(xmldata, sizeof(xmldata)));
 
         check("void foo() {\n"
               "    if (x() || x()) {}\n"
diff --git a/test/testplatform.cpp b/test/testplatform.cpp
index 6b474abab..94c126fe1 100644
--- a/test/testplatform.cpp
+++ b/test/testplatform.cpp
@@ -45,8 +45,7 @@ private:
 
     static bool readPlatform(cppcheck::Platform& platform, const char* xmldata) {
         tinyxml2::XMLDocument doc;
-        doc.Parse(xmldata);
-        return platform.loadFromXmlDocument(&doc);
+        return (doc.Parse(xmldata) == tinyxml2::XML_SUCCESS) && platform.loadFromXmlDocument(&doc);
     }
 
     void empty() const {
diff --git a/test/testsymboldatabase.cpp b/test/testsymboldatabase.cpp
index 8fdf1f34e..6315162c9 100644
--- a/test/testsymboldatabase.cpp
+++ b/test/testsymboldatabase.cpp
@@ -7856,10 +7856,8 @@ private:
                                "<function name=\"g\">\n" \
                                "<returnValue type=\"" #type "\"/>\n" \
                                "</function>\n" \
-                               "</def>"; \
-        tinyxml2::XMLDocument doc; \
-        doc.Parse(xmldata, sizeof(xmldata)); \
-        sF.library.load(doc); \
+                               "</def>";              \
+        ASSERT(sF.library.loadxmldata(xmldata, sizeof(xmldata))); \
         ASSERT_EQUALS(#type, typeOf("void f() { auto x = g(); }", "x", "test.cpp", &sF)); \
 } while (false)
         // *INDENT-OFF*
diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 2c1c89a07..cc679eb1e 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -58,8 +58,11 @@ private:
         settings_windows.checkUnusedTemplates = true;
 
         // library=qt
+        LOAD_LIB_2(settings0.library, "qt.cfg");
         settings0.libraries.emplace_back("qt");
+        LOAD_LIB_2(settings1.library, "qt.cfg");
         settings1.libraries.emplace_back("qt");
+        LOAD_LIB_2(settings2.library, "qt.cfg");
         settings2.libraries.emplace_back("qt");
 
         TEST_CASE(tokenize1);