diff --git a/src/3rdparty/tinycbor/tests/encoder/data.cpp b/src/3rdparty/tinycbor/tests/encoder/data.cpp
index 2c902d85eef..dc7c6a91a1a 100644
--- a/src/3rdparty/tinycbor/tests/encoder/data.cpp
+++ b/src/3rdparty/tinycbor/tests/encoder/data.cpp
@@ -24,7 +24,29 @@
 
 #include <QtTest>
 
-static float myNaNf()
+struct NegativeInteger { quint64 abs; };
+Q_DECLARE_METATYPE(NegativeInteger)
+
+struct SimpleType { uint8_t type; };
+Q_DECLARE_METATYPE(SimpleType)
+
+struct Float16Standin { uint16_t val; };
+Q_DECLARE_METATYPE(Float16Standin)
+
+struct Tag { CborTag tag; QVariant tagged; };
+Q_DECLARE_METATYPE(Tag)
+
+typedef QVector<QPair<QVariant, QVariant>> Map;
+Q_DECLARE_METATYPE(Map)
+
+struct IndeterminateLengthArray : QVariantList { using QVariantList::QVariantList; };
+struct IndeterminateLengthMap : Map { using Map::Map; };
+Q_DECLARE_METATYPE(IndeterminateLengthArray)
+Q_DECLARE_METATYPE(IndeterminateLengthMap)
+
+namespace {
+
+float myNaNf()
 {
     uint32_t v = 0x7fc00000;
     float f;
@@ -33,7 +55,7 @@ static float myNaNf()
     return f;
 }
 
-static float myInff()
+float myInff()
 {
     uint32_t v = 0x7f800000;
     float f;
@@ -42,7 +64,7 @@ static float myInff()
     return f;
 }
 
-static float myNInff()
+float myNInff()
 {
     uint32_t v = 0xff800000;
     float f;
@@ -51,7 +73,7 @@ static float myNInff()
     return f;
 }
 
-static double myNaN()
+double myNaN()
 {
     uint64_t v = UINT64_C(0x7ff8000000000000);
     double f;
@@ -60,7 +82,7 @@ static double myNaN()
     return f;
 }
 
-static double myInf()
+double myInf()
 {
     uint64_t v = UINT64_C(0x7ff0000000000000);
     double f;
@@ -69,7 +91,7 @@ static double myInf()
     return f;
 }
 
-static double myNInf()
+double myNInf()
 {
     uint64_t v = UINT64_C(0xfff0000000000000);
     double f;
@@ -83,36 +105,17 @@ template <size_t N> QByteArray raw(const char (&data)[N])
     return QByteArray::fromRawData(data, N - 1);
 }
 
-struct NegativeInteger { quint64 abs; };
-Q_DECLARE_METATYPE(NegativeInteger)
-
-struct SimpleType { uint8_t type; };
-Q_DECLARE_METATYPE(SimpleType)
-
-struct Float16Standin { uint16_t val; };
-Q_DECLARE_METATYPE(Float16Standin)
-
-struct Tag { CborTag tag; QVariant tagged; };
-Q_DECLARE_METATYPE(Tag)
-
 template <typename... Args>
 QVariant make_list(const Args &... args)
 {
     return QVariantList{args...};
 }
 
-typedef QVector<QPair<QVariant, QVariant>> Map;
-Q_DECLARE_METATYPE(Map)
 QVariant make_map(const std::initializer_list<QPair<QVariant, QVariant>> &list)
 {
     return QVariant::fromValue(Map(list));
 }
 
-struct IndeterminateLengthArray : QVariantList { using QVariantList::QVariantList; };
-struct IndeterminateLengthMap : Map { using Map::Map; };
-Q_DECLARE_METATYPE(IndeterminateLengthArray)
-Q_DECLARE_METATYPE(IndeterminateLengthMap)
-
 QVariant make_ilarray(const std::initializer_list<QVariant> &list)
 {
     return QVariant::fromValue(IndeterminateLengthArray(list));
@@ -343,4 +346,4 @@ void addArraysAndMaps()
     QTest::newRow("array-1(map)") << raw("\x81\xc1\xa0") << make_list(QVariant::fromValue(Tag{1, make_map({})}));
     QTest::newRow("map-1(2):3(4)") << raw("\xa1\xc1\2\xc3\4") << make_map({{QVariant::fromValue(Tag{1, 2}), QVariant::fromValue(Tag{3, 4})}});
 }
-
+} // namespace
diff --git a/src/3rdparty/tinycbor/tests/parser/data.cpp b/src/3rdparty/tinycbor/tests/parser/data.cpp
index f701a5a5b0c..c99160ad31f 100644
--- a/src/3rdparty/tinycbor/tests/parser/data.cpp
+++ b/src/3rdparty/tinycbor/tests/parser/data.cpp
@@ -28,6 +28,8 @@
 
 Q_DECLARE_METATYPE(CborError)
 
+namespace {
+
 template <size_t N> QByteArray raw(const char (&data)[N])
 {
     return QByteArray::fromRawData(data, N - 1);
@@ -605,3 +607,4 @@ void addValidationData(size_t minInvalid = ~size_t(0))
     // This test technically tests the dumper, not the parser.
     QTest::newRow("string-utf8-chunk-split") << raw("\x81\x7f\x61\xc2\x61\xa0\xff") << 0 << CborErrorInvalidUtf8TextString;
 }
+} // namespace
diff --git a/tests/auto/CMakeLists.txt b/tests/auto/CMakeLists.txt
index 4c59cf7ee38..2c977c0ddf1 100644
--- a/tests/auto/CMakeLists.txt
+++ b/tests/auto/CMakeLists.txt
@@ -34,6 +34,7 @@ if(QT_BUILD_MINIMAL_ANDROID_MULTI_ABI_TESTS)
 endif()
 
 if(WASM)
+    add_subdirectory(corelib/serialization)
     add_subdirectory(corelib/text)
     return()
 endif()
diff --git a/tests/auto/corelib/serialization/CMakeLists.txt b/tests/auto/corelib/serialization/CMakeLists.txt
index f728aeb6f7d..ef40e78d249 100644
--- a/tests/auto/corelib/serialization/CMakeLists.txt
+++ b/tests/auto/corelib/serialization/CMakeLists.txt
@@ -13,6 +13,6 @@ endif()
 if(TARGET Qt::Network)
     add_subdirectory(qtextstream)
 endif()
-if(TARGET Qt::Gui AND TARGET Qt::Network AND TARGET Qt::Xml AND NOT INTEGRITY AND NOT QNX)
+if(TARGET Qt::Gui AND TARGET Qt::Network AND TARGET Qt::Xml AND NOT INTEGRITY AND NOT QNX AND NOT WASM)
     add_subdirectory(qxmlstream)
 endif()
diff --git a/tests/auto/corelib/serialization/cborlargedatavalidation.cpp b/tests/auto/corelib/serialization/cborlargedatavalidation.cpp
index ac1305057c8..71ea1a9cfde 100644
--- a/tests/auto/corelib/serialization/cborlargedatavalidation.cpp
+++ b/tests/auto/corelib/serialization/cborlargedatavalidation.cpp
@@ -26,7 +26,6 @@ protected:
     qint64 readData(char *data, qint64 maxlen) override;
     qint64 writeData(const char *, qint64) override { return -1; }
 };
-};
 
 qint64 LargeIODevice::readData(char *data, qint64 maxlen)
 {
@@ -118,3 +117,4 @@ void addValidationHugeDevice(qsizetype byteArrayInvalid, qsizetype stringInvalid
     addSize("4GB", quint64(1) << 32);
     addSize("max", std::numeric_limits<qint64>::max() - sizeof(buf));
 }
+} // namespace
diff --git a/tests/auto/corelib/serialization/qcborstreamreader/CMakeLists.txt b/tests/auto/corelib/serialization/qcborstreamreader/CMakeLists.txt
index bab3771b749..29a935977b9 100644
--- a/tests/auto/corelib/serialization/qcborstreamreader/CMakeLists.txt
+++ b/tests/auto/corelib/serialization/qcborstreamreader/CMakeLists.txt
@@ -16,7 +16,7 @@ qt_internal_add_test(tst_qcborstreamreader
         tst_qcborstreamreader.cpp
     INCLUDE_DIRECTORIES
         ../../../../../src/3rdparty/tinycbor/src
-        ../../../../../src/3rdparty/tinycbor/tests/parser
+        ../../../../../src/3rdparty/tinycbor/tests
     LIBRARIES
         Qt::CorePrivate
 )
diff --git a/tests/auto/corelib/serialization/qcborstreamreader/tst_qcborstreamreader.cpp b/tests/auto/corelib/serialization/qcborstreamreader/tst_qcborstreamreader.cpp
index afd02dc6b70..96d0f77c327 100644
--- a/tests/auto/corelib/serialization/qcborstreamreader/tst_qcborstreamreader.cpp
+++ b/tests/auto/corelib/serialization/qcborstreamreader/tst_qcborstreamreader.cpp
@@ -88,7 +88,7 @@ template<> char *toString<QCborStreamReader::Type>(const QCborStreamReader::Type
 QT_END_NAMESPACE
 
 // Get the data from TinyCBOR (see src/3rdparty/tinycbor/tests/parser/data.cpp)
-#include "data.cpp"
+#include "parser/data.cpp"
 
 void tst_QCborStreamReader::initTestCase_data()
 {
@@ -927,6 +927,10 @@ void tst_QCborStreamReader::hugeDeviceValidation()
         QSKIP("This test tries to allocate a huge memory buffer,"
               " which Address Sanitizer flags as a problem");
 #endif
+#if defined(Q_OS_WASM)
+   QSKIP("This test tries to allocate a huge memory buffer,"
+              " causes problem on WebAssembly platform which has limited resources.");
+#endif // Q_OS_WASM
 
     QFETCH(QSharedPointer<QIODevice>, device);
     QFETCH(CborError, expectedError);
diff --git a/tests/auto/corelib/serialization/qcborstreamwriter/CMakeLists.txt b/tests/auto/corelib/serialization/qcborstreamwriter/CMakeLists.txt
index b8721f7ad71..c1a9a87677c 100644
--- a/tests/auto/corelib/serialization/qcborstreamwriter/CMakeLists.txt
+++ b/tests/auto/corelib/serialization/qcborstreamwriter/CMakeLists.txt
@@ -15,5 +15,5 @@ qt_internal_add_test(tst_qcborstreamwriter
     SOURCES
         tst_qcborstreamwriter.cpp
     INCLUDE_DIRECTORIES
-        ../../../../../src/3rdparty/tinycbor/tests/encoder
+        ../../../../../src/3rdparty/tinycbor/tests
 )
diff --git a/tests/auto/corelib/serialization/qcborstreamwriter/tst_qcborstreamwriter.cpp b/tests/auto/corelib/serialization/qcborstreamwriter/tst_qcborstreamwriter.cpp
index 898fb785e8a..72a05943206 100644
--- a/tests/auto/corelib/serialization/qcborstreamwriter/tst_qcborstreamwriter.cpp
+++ b/tests/auto/corelib/serialization/qcborstreamwriter/tst_qcborstreamwriter.cpp
@@ -29,7 +29,7 @@ private Q_SLOTS:
 
 // Get the data from TinyCBOR (see src/3rdparty/tinycbor/tests/encoder/data.cpp)
 typedef quint64 CborTag;
-#include "data.cpp"
+#include "encoder/data.cpp"
 
 void encodeVariant(QCborStreamWriter &writer, const QVariant &v)
 {
diff --git a/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp b/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
index 4e108672d97..202ecf2a6e6 100644
--- a/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
+++ b/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
@@ -2399,6 +2399,11 @@ void tst_QCborValue::hugeDeviceValidation_data()
 
 void tst_QCborValue::hugeDeviceValidation()
 {
+#if defined(Q_OS_WASM)
+    QSKIP("This test tries to allocate a huge memory buffer,"
+          " causes problem on WebAssembly platform which has limited resources.");
+#endif // Q_OS_WASM
+
     QFETCH(QSharedPointer<QIODevice>, device);
     QFETCH(CborError, expectedError);
     QCborError error = { QCborError::Code(expectedError) };
diff --git a/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp b/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp
index 3c9a83c5aa4..1b2fb299443 100644
--- a/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp
+++ b/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp
@@ -3895,5 +3895,6 @@ void tst_QDataStream::typedefQt5Compat()
 }
 
 QTEST_MAIN(tst_QDataStream)
+
 #include "tst_qdatastream.moc"
 
diff --git a/tests/auto/corelib/serialization/qdatastream_core_pixmap/tst_qdatastream_core_pixmap.cpp b/tests/auto/corelib/serialization/qdatastream_core_pixmap/tst_qdatastream_core_pixmap.cpp
index 1b11782bbd7..06d553b0050 100644
--- a/tests/auto/corelib/serialization/qdatastream_core_pixmap/tst_qdatastream_core_pixmap.cpp
+++ b/tests/auto/corelib/serialization/qdatastream_core_pixmap/tst_qdatastream_core_pixmap.cpp
@@ -5,7 +5,7 @@
 #include <QtGui/QPixmap>
 #include <QtGui/QImage>
 
-class tst_QDataStream : public QObject
+class tst_QDataStreamPixmap : public QObject
 {
 Q_OBJECT
 
@@ -13,7 +13,7 @@ private slots:
     void stream_with_pixmap();
 };
 
-void tst_QDataStream::stream_with_pixmap()
+void tst_QDataStreamPixmap::stream_with_pixmap()
 {
     // This is a QVariantMap with a 3x3 red QPixmap and two strings inside
     const QByteArray ba = QByteArray::fromBase64(
@@ -37,6 +37,6 @@ void tst_QDataStream::stream_with_pixmap()
     QCOMPARE(map["z"].toString(), QString("there"));
 }
 
-QTEST_GUILESS_MAIN(tst_QDataStream)
+QTEST_GUILESS_MAIN(tst_QDataStreamPixmap)
 
 #include "tst_qdatastream_core_pixmap.moc"