diff --git a/kerfuffle/archive_kerfuffle.h b/kerfuffle/archive_kerfuffle.h
--- a/kerfuffle/archive_kerfuffle.h
+++ b/kerfuffle/archive_kerfuffle.h
@@ -37,6 +37,8 @@
 #include <QVariant>
 #include <QDebug>
 
+#include <KServiceTypeTrader>
+
 class KJob;
 
 namespace Kerfuffle
@@ -130,6 +132,11 @@
     Q_OBJECT
 
 public:
+
+    static bool comparePlugins(const KService::Ptr &p1, const KService::Ptr &p2);
+    static QString determineMimeType(const QString& filename);
+    static KService::List findPluginOffers(const QString& filename, const QString& fixedMimeType);
+
     static Archive *create(const QString &fileName, QObject *parent = 0);
     static Archive *create(const QString &fileName, const QString &fixedMimeType, QObject *parent = 0);
     ~Archive();
diff --git a/kerfuffle/archive_kerfuffle.cpp b/kerfuffle/archive_kerfuffle.cpp
--- a/kerfuffle/archive_kerfuffle.cpp
+++ b/kerfuffle/archive_kerfuffle.cpp
@@ -39,14 +39,16 @@
 
 #include <KPluginLoader>
 #include <KMimeTypeTrader>
-#include <KServiceTypeTrader>
 
-static bool comparePlugins(const KService::Ptr &p1, const KService::Ptr &p2)
+namespace Kerfuffle
+{
+
+bool Archive::comparePlugins(const KService::Ptr &p1, const KService::Ptr &p2)
 {
     return (p1->property(QLatin1String( "X-KDE-Priority" )).toInt()) > (p2->property(QLatin1String( "X-KDE-Priority" )).toInt());
 }
 
-static QString determineMimeType(const QString& filename)
+QString Archive::determineMimeType(const QString& filename)
 {
     QMimeDatabase db;
     QMimeType mimeFromExtension = db.mimeTypeForFile(filename, QMimeDatabase::MatchExtension);
@@ -79,7 +81,7 @@
     return mimeFromContent.name();
 }
 
-static KService::List findPluginOffers(const QString& filename, const QString& fixedMimeType)
+KService::List Archive::findPluginOffers(const QString& filename, const QString& fixedMimeType)
 {
     KService::List offers;
 
@@ -99,9 +101,6 @@
     return offers;
 }
 
-namespace Kerfuffle
-{
-
 QDebug operator<<(QDebug d, const fileRootNodePair &pair)
 {
     d.nospace() << "fileRootNodePair(" << pair.file << "," << pair.rootNode << ")";
diff --git a/kerfuffle/tests/CMakeLists.txt b/kerfuffle/tests/CMakeLists.txt
--- a/kerfuffle/tests/CMakeLists.txt
+++ b/kerfuffle/tests/CMakeLists.txt
@@ -20,4 +20,5 @@
 KERFUFFLE_UNIT_TESTS(
     archivetest
     jobstest
+    mimetypetest
 )
diff --git a/kerfuffle/tests/data/zip_with_wrong_extension.rar b/kerfuffle/tests/data/zip_with_wrong_extension.rar
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001

diff --git a/kerfuffle/tests/mimetypetest.cpp b/kerfuffle/tests/mimetypetest.cpp
new file mode 100644
--- /dev/null
+++ b/kerfuffle/tests/mimetypetest.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2015 Elvis Angelaccio <elvis.angelaccio@kdemail.net>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ( INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION ) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * ( INCLUDING NEGLIGENCE OR OTHERWISE ) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "kerfuffle/archive_kerfuffle.h"
+
+#include <QTest>
+
+using namespace Kerfuffle;
+
+class MimeTypeTest : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+
+    void testEmptyFilename();
+    void testTarDetection();
+    void testWrongZipExtension();
+
+};
+
+QTEST_GUILESS_MAIN(MimeTypeTest)
+
+void MimeTypeTest::testEmptyFilename()
+{
+    QCOMPARE(Archive::determineMimeType(QString()), QStringLiteral("application/octet-stream"));
+}
+
+void MimeTypeTest::testTarDetection()
+{
+    const QString testFile = QFINDTESTDATA("data/simplearchive.tar.gz");
+    QCOMPARE(Archive::determineMimeType(testFile), QStringLiteral("application/x-compressed-tar"));
+}
+
+void MimeTypeTest::testWrongZipExtension()
+{
+    const QString testFile = QFINDTESTDATA("data/zip_with_wrong_extension.rar");
+    QCOMPARE(Archive::determineMimeType(testFile), QStringLiteral("application/zip"));
+}
+
+#include "mimetypetest.moc"