diff --git a/sources/test/CMakeLists.txt b/sources/test/CMakeLists.txt
index f28898a..0ed3817 100644
--- a/sources/test/CMakeLists.txt
+++ b/sources/test/CMakeLists.txt
@@ -11,47 +11,53 @@ include_directories(
         ${Kf5_INCLUDE}
 )
 
+## library
+set(AWTESTLIBRARY_HEADERS awtestlibrary.h)
+set(AWTESTLIBRARY_SOURCES awtestlibrary.cpp)
+add_library(${SUBPROJECT}-awtest STATIC ${AWTESTLIBRARY_SOURCES} ${AWTESTLIBRARY_HEADERS})
+target_link_libraries(${SUBPROJECT}-awtest ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
+set(LIBRARY_TEST_SET ${SUBPROJECT}-awtest ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
 ## extensions
 # abstractextitem
 set(ABSTRACTEXTITEM_HEADERS testabstractextitem.h)
 set(ABSTRACTEXTITEM_SOURCES testabstractextitem.cpp)
 add_executable(${SUBPROJECT}-abstractextitem ${ABSTRACTEXTITEM_HEADERS} ${ABSTRACTEXTITEM_SOURCES})
-target_link_libraries(${SUBPROJECT}-abstractextitem ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
+target_link_libraries(${SUBPROJECT}-abstractextitem ${LIBRARY_TEST_SET})
 add_test(NAME "AbstractExtItem" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-abstractextitem)
 # extquotes
 set(EXTQUOTES_HEADERS testextquotes.h)
 set(EXTQUOTES_SOURCES testextquotes.cpp)
 add_executable(${SUBPROJECT}-extquotes ${EXTQUOTES_HEADERS} ${EXTQUOTES_SOURCES})
-target_link_libraries(${SUBPROJECT}-extquotes ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
+target_link_libraries(${SUBPROJECT}-extquotes ${LIBRARY_TEST_SET})
 add_test(NAME "ExtQuotes" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-extquotes)
 # extscript
 set(EXTSCRIPT_HEADERS testextscript.h)
 set(EXTSCRIPT_SOURCES testextscript.cpp)
 add_executable(${SUBPROJECT}-extscript ${EXTSCRIPT_HEADERS} ${EXTSCRIPT_SOURCES})
-target_link_libraries(${SUBPROJECT}-extscript ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
+target_link_libraries(${SUBPROJECT}-extscript ${LIBRARY_TEST_SET})
 add_test(NAME "ExtScript" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-extscript)
 # extupgrade
 set(EXTUPGRADE_HEADERS testextupgrade.h)
 set(EXTUPGRADE_SOURCES testextupgrade.cpp)
 add_executable(${SUBPROJECT}-extupgrade ${EXTUPGRADE_HEADERS} ${EXTUPGRADE_SOURCES})
-target_link_libraries(${SUBPROJECT}-extupgrade ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
+target_link_libraries(${SUBPROJECT}-extupgrade ${LIBRARY_TEST_SET})
 add_test(NAME "ExtUpgrade" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-extupgrade)
 # extweather
 set(EXTWEATHER_HEADERS testextweather.h)
 set(EXTWEATHER_SOURCES testextweather.cpp)
 add_executable(${SUBPROJECT}-extweather ${EXTWEATHER_HEADERS} ${EXTWEATHER_SOURCES})
-target_link_libraries(${SUBPROJECT}-extweather ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
+target_link_libraries(${SUBPROJECT}-extweather ${LIBRARY_TEST_SET})
 add_test(NAME "ExtWeather" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-extweather)
 ## formatters
 # float formatter
 set(FLOATFORMATTER_HEADERS testfloatformatter.h)
 set(FLOATFORMATTER_SOURCES testfloatformatter.cpp)
 add_executable(${SUBPROJECT}-floatformatter ${FLOATFORMATTER_HEADERS} ${FLOATFORMATTER_SOURCES})
-target_link_libraries(${SUBPROJECT}-floatformatter ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
-add_test(NAME "FloatFormatter" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-floatformatter)
+target_link_libraries(${SUBPROJECT}-floatformatter ${LIBRARY_TEST_SET})
+add_test(NAME "Float4Formatter" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-floatformatter)
 # no formatter
 set(NOFORMATTER_HEADERS testnoformatter.h)
 set(NOFORMATTER_SOURCES testnoformatter.cpp)
 add_executable(${SUBPROJECT}-noformatter ${NOFORMATTER_HEADERS} ${NOFORMATTER_SOURCES})
-target_link_libraries(${SUBPROJECT}-noformatter ${PROJECT_LIBRARY} ${Qt_LIBRARIES} ${Qt5Test_LIBRARIES})
+target_link_libraries(${SUBPROJECT}-noformatter ${LIBRARY_TEST_SET})
 add_test(NAME "NoFormatter" COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${SUBPROJECT}-noformatter)
diff --git a/sources/test/awtestlibrary.cpp b/sources/test/awtestlibrary.cpp
new file mode 100644
index 0000000..f1eb1db
--- /dev/null
+++ b/sources/test/awtestlibrary.cpp
@@ -0,0 +1,61 @@
+/***************************************************************************
+ *   This file is part of awesome-widgets                                  *
+ *                                                                         *
+ *   awesome-widgets is free software: you can redistribute it and/or      *
+ *   modify it under the terms of the GNU General Public License as        *
+ *   published by the Free Software Foundation, either version 3 of the    *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   awesome-widgets is distributed in the hope that it will be useful,    *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with awesome-widgets. If not, see http://www.gnu.org/licenses/  *
+ ***************************************************************************/
+
+
+#include "awtestlibrary.h"
+
+
+char AWTestLibrary::randomChar()
+{
+    return 'A' + (rand() % static_cast<int>('Z' - 'A'));
+}
+
+
+double AWTestLibrary::randomDouble()
+{
+    return static_cast<double>(rand()) / static_cast<double>(RAND_MAX);
+}
+
+
+int AWTestLibrary::randomInt(const int max)
+{
+    return rand() % max;
+}
+
+
+QString AWTestLibrary::randomString(const int max)
+{
+    QString output;
+
+    int count = 1 + randomInt(max);
+    for (int i = 0; i < count; i++)
+        output += QChar(randomChar());
+
+    return output;
+}
+
+
+QStringList AWTestLibrary::randomStringList(const int max)
+{
+    QStringList output;
+
+    int count = 1 + randomInt(max);
+    for (int i = 0; i < count; i++)
+        output.append(randomString());
+
+    return output;
+}
diff --git a/sources/test/awtestlibrary.h b/sources/test/awtestlibrary.h
new file mode 100644
index 0000000..a4d1096
--- /dev/null
+++ b/sources/test/awtestlibrary.h
@@ -0,0 +1,35 @@
+/***************************************************************************
+ *   This file is part of awesome-widgets                                  *
+ *                                                                         *
+ *   awesome-widgets is free software: you can redistribute it and/or      *
+ *   modify it under the terms of the GNU General Public License as        *
+ *   published by the Free Software Foundation, either version 3 of the    *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   awesome-widgets is distributed in the hope that it will be useful,    *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with awesome-widgets. If not, see http://www.gnu.org/licenses/  *
+ ***************************************************************************/
+
+
+#ifndef AWTESTLIBRARY_H
+#define AWTESTLIBRARY_H
+
+#include <QStringList>
+
+
+namespace AWTestLibrary
+{
+    char randomChar();
+    double randomDouble();
+    int randomInt(const int max = 100);
+    QString randomString(const int max = 100);
+    QStringList randomStringList(const int max = 100);
+};
+
+
+#endif /* AWTESTLIBRARY_H */
diff --git a/sources/test/testabstractextitem.cpp b/sources/test/testabstractextitem.cpp
index dcb48d5..ffb9068 100644
--- a/sources/test/testabstractextitem.cpp
+++ b/sources/test/testabstractextitem.cpp
@@ -20,6 +20,7 @@
 
 #include <QtTest>
 
+#include "awtestlibrary.h"
 #include "extupgrade.h"
 
 
@@ -114,13 +115,10 @@ void TestAbstractExtItem::generateFilename()
     writeFileName = QString("%1/awesomewidgets/tmp/")
                         .arg(QStandardPaths::writableLocation(
                             QStandardPaths::GenericDataLocation));
-    int diff = 'Z' - 'A';
-    int count = rand() % 20 + 1;
-    for (int i = 0; i < count; i++) {
-        char c = 'A' + (rand() % diff);
-        fileName += QChar(c);
-        writeFileName += QChar(c);
-    }
+
+    QString name = AWTestLibrary::randomString(20);
+    fileName += name;
+    writeFileName += name;
 }
 
 
diff --git a/sources/test/testextscript.cpp b/sources/test/testextscript.cpp
index e5c8619..4ecc050 100644
--- a/sources/test/testextscript.cpp
+++ b/sources/test/testextscript.cpp
@@ -20,12 +20,13 @@
 
 #include <QtTest>
 
+#include "awtestlibrary.h"
 #include "extscript.h"
 
 
 void TestExtScript::initTestCase()
 {
-    generateRandomString();
+    randomString = AWTestLibrary::randomString();
 
     extScript = new ExtScript(nullptr);
     extScript->setInterval(1);
@@ -102,17 +103,4 @@ void TestExtScript::test_copy()
 }
 
 
-void TestExtScript::generateRandomString()
-{
-    randomString.clear();
-
-    int diff = 'Z' - 'A';
-    int count = rand() % 100 + 1;
-    for (int i = 0; i < count; i++) {
-        char c = 'A' + (rand() % diff);
-        randomString += QChar(c);
-    }
-}
-
-
 QTEST_MAIN(TestExtScript);
diff --git a/sources/test/testextscript.h b/sources/test/testextscript.h
index 16cbb2d..01bed73 100644
--- a/sources/test/testextscript.h
+++ b/sources/test/testextscript.h
@@ -40,7 +40,6 @@ private slots:
     void test_copy();
 
 private:
-    void generateRandomString();
     ExtScript *extScript = nullptr;
     QString randomString;
 };
diff --git a/sources/test/testextupgrade.cpp b/sources/test/testextupgrade.cpp
index 3e4f44c..9b149a0 100644
--- a/sources/test/testextupgrade.cpp
+++ b/sources/test/testextupgrade.cpp
@@ -20,12 +20,14 @@
 
 #include <QtTest>
 
+#include "awtestlibrary.h"
 #include "extupgrade.h"
 
 
 void TestExtUpgrade::initTestCase()
 {
-    generateRandomStrings();
+    randomStrings = AWTestLibrary::randomStringList();
+    cmd = QString("echo -e '%1'").arg(randomStrings.join(QString("\n")));
 
     extUpgrade = new ExtUpgrade(nullptr);
     extUpgrade->setInterval(1);
@@ -68,7 +70,7 @@ void TestExtUpgrade::test_run()
 
 void TestExtUpgrade::test_null()
 {
-    int null = rand() % randomStrings.count();
+    int null = AWTestLibrary::randomInt(randomStrings.count());
     extUpgrade->setNull(null);
     QSignalSpy spy(extUpgrade, SIGNAL(dataReceived(const QVariantHash &)));
     extUpgrade->run();
@@ -85,9 +87,9 @@ void TestExtUpgrade::test_null()
 void TestExtUpgrade::test_filter()
 {
     QSet<QString> filters;
-    int count = rand() % randomStrings.count();
+    int count = AWTestLibrary::randomInt(randomStrings.count());
     for (int i = 0; i < count; i++) {
-        int index = rand() % randomStrings.count();
+        int index = AWTestLibrary::randomInt(randomStrings.count());
         filters << randomStrings.at(index);
     }
 
@@ -120,29 +122,4 @@ void TestExtUpgrade::test_copy()
 }
 
 
-QString TestExtUpgrade::generateRandomString() const
-{
-    QString string;
-    int diff = 'Z' - 'A';
-    int count = rand() % 100 + 1;
-    for (int i = 0; i < count; i++) {
-        char c = 'A' + (rand() % diff);
-        string += QChar(c);
-    }
-
-    return string;
-}
-
-
-void TestExtUpgrade::generateRandomStrings()
-{
-    randomStrings.clear();
-
-    int count = rand() % 100 + 1;
-    for (int i = 0; i < count; i++)
-        randomStrings.append(generateRandomString());
-    cmd = QString("echo -e '%1'").arg(randomStrings.join(QString("\n")));
-}
-
-
 QTEST_MAIN(TestExtUpgrade);
diff --git a/sources/test/testextupgrade.h b/sources/test/testextupgrade.h
index e20b3a5..99f8a0b 100644
--- a/sources/test/testextupgrade.h
+++ b/sources/test/testextupgrade.h
@@ -41,8 +41,6 @@ private slots:
     void test_copy();
 
 private:
-    QString generateRandomString() const;
-    void generateRandomStrings();
     ExtUpgrade *extUpgrade = nullptr;
     QString cmd;
     QStringList randomStrings;
diff --git a/sources/test/testfloatformatter.cpp b/sources/test/testfloatformatter.cpp
index c035880..711e6c6 100644
--- a/sources/test/testfloatformatter.cpp
+++ b/sources/test/testfloatformatter.cpp
@@ -20,6 +20,7 @@
 
 #include <QtTest>
 
+#include "awtestlibrary.h"
 #include "awfloatformatter.h"
 
 
@@ -43,12 +44,12 @@ void TestAWFloatFormatter::test_values()
 void TestAWFloatFormatter::test_count()
 {
     // assign
-    int count = 10 + rand() % 200;
+    int count = 10 + AWTestLibrary::randomInt();
     formatter->setCount(count);
     QCOMPARE(formatter->count(), count);
 
     // test
-    float value = getValue();
+    double value = AWTestLibrary::randomDouble();
     QString output = formatter->convert(value);
     QCOMPARE(output.count(), count);
 
@@ -60,13 +61,13 @@ void TestAWFloatFormatter::test_count()
 void TestAWFloatFormatter::test_fillChar()
 {
     // assign
-    char c = 'A' + (rand() % static_cast<int>('Z' - 'A'));
+    char c = AWTestLibrary::randomChar();
     formatter->setFillChar(QChar(c));
     QCOMPARE(formatter->fillChar(), QChar(c));
     formatter->setCount(101);
 
     // test
-    int value = rand() % 100;
+    int value = AWTestLibrary::randomInt();
     QString output = formatter->convert(value);
     QVERIFY(output.startsWith(QChar(c)));
 
@@ -86,7 +87,7 @@ void TestAWFloatFormatter::test_format()
     QCOMPARE(formatter->format(), 'e');
 
     // test
-    float value = getValue();
+    double value = AWTestLibrary::randomDouble();
     QString output = formatter->convert(value);
     QVERIFY(output.contains('e'));
 
@@ -98,12 +99,12 @@ void TestAWFloatFormatter::test_format()
 void TestAWFloatFormatter::test_precision()
 {
     // assign
-    int precision = 1 + rand() % 5;
+    int precision = 1 + AWTestLibrary::randomInt(5);
     formatter->setPrecision(precision);
     QCOMPARE(formatter->precision(), precision);
 
     // test
-    float value = getValue();
+    double value = AWTestLibrary::randomDouble();
     QString output = formatter->convert(value);
     output.remove(QString("0."));
     QCOMPARE(output.count(), precision);
@@ -118,13 +119,14 @@ void TestAWFloatFormatter::test_multiplier()
     formatter->setPrecision(6);
 
     // assign
-    double multiplier = getValue();
+    double multiplier = AWTestLibrary::randomDouble();
     formatter->setMultiplier(multiplier);
     QCOMPARE(formatter->multiplier(), multiplier);
 
     // test
-    double value = getValue();
-    QCOMPARE(formatter->convert(value), QString::number(value * multiplier, 'f', 6));
+    double value = AWTestLibrary::randomDouble();
+    QCOMPARE(formatter->convert(value),
+             QString::number(value * multiplier, 'f', 6));
 
     // reset
     formatter->setMultiplier(1.0);
@@ -134,13 +136,14 @@ void TestAWFloatFormatter::test_multiplier()
 void TestAWFloatFormatter::test_summand()
 {
     // assign
-    double summand = getValue();
+    double summand = AWTestLibrary::randomDouble();
     formatter->setSummand(summand);
     QCOMPARE(formatter->summand(), summand);
 
     // test
-    double value = getValue();
-    QCOMPARE(formatter->convert(value), QString::number(value + summand, 'f', 6));
+    double value = AWTestLibrary::randomDouble();
+    QCOMPARE(formatter->convert(value),
+             QString::number(value + summand, 'f', 6));
 
     // reset
     formatter->setSummand(1.0);
@@ -166,18 +169,12 @@ void TestAWFloatFormatter::test_copy()
 
 void TestAWFloatFormatter::doRandom()
 {
-    formatter->setCount(rand() % 100);
-    formatter->setFillChar(QChar('A' + (rand() % static_cast<int>('Z' - 'A'))));
-    formatter->setFormat('A' + (rand() % static_cast<int>('Z' - 'A')));
-    formatter->setMultiplier(getValue());
-    formatter->setPrecision(rand() % 100);
-    formatter->setSummand(getValue());
-}
-
-
-float TestAWFloatFormatter::getValue() const
-{
-    return static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
+    formatter->setCount(AWTestLibrary::randomInt());
+    formatter->setFillChar(QChar(AWTestLibrary::randomChar()));
+    formatter->setFormat(AWTestLibrary::randomChar());
+    formatter->setMultiplier(AWTestLibrary::randomDouble());
+    formatter->setPrecision(AWTestLibrary::randomInt());
+    formatter->setSummand(AWTestLibrary::randomDouble());
 }
 
 
diff --git a/sources/test/testfloatformatter.h b/sources/test/testfloatformatter.h
index ea88f53..8ee99f7 100644
--- a/sources/test/testfloatformatter.h
+++ b/sources/test/testfloatformatter.h
@@ -45,7 +45,6 @@ private slots:
 
 private:
     void doRandom();
-    float getValue() const;
     AWFloatFormatter *formatter = nullptr;
 };
 
diff --git a/sources/test/testnoformatter.cpp b/sources/test/testnoformatter.cpp
index b4db641..dc5a937 100644
--- a/sources/test/testnoformatter.cpp
+++ b/sources/test/testnoformatter.cpp
@@ -20,6 +20,7 @@
 
 #include <QtTest>
 
+#include "awtestlibrary.h"
 #include "awnoformatter.h"
 
 
@@ -43,12 +44,12 @@ void TestAWNoFormatter::test_values()
 void TestAWNoFormatter::test_conversion()
 {
     // integer
-    int randomInt = rand();
+    int randomInt = AWTestLibrary::randomInt();
     QCOMPARE(formatter->convert(randomInt), QString::number(randomInt));
     // float
     QWARN("Float conversion isn't tested here due to possible rounding errors");
     // string
-    QString randomString = generateRandomString();
+    QString randomString = AWTestLibrary::randomString();
     QCOMPARE(formatter->convert(randomString), randomString);
 }
 
@@ -63,19 +64,4 @@ void TestAWNoFormatter::test_copy()
 }
 
 
-QString TestAWNoFormatter::generateRandomString()
-{
-    QString string;
-
-    int diff = 'Z' - 'A';
-    int count = rand() % 100 + 1;
-    for (int i = 0; i < count; i++) {
-        char c = 'A' + (rand() % diff);
-        string += QChar(c);
-    }
-
-    return string;
-}
-
-
 QTEST_MAIN(TestAWNoFormatter);
diff --git a/sources/test/testnoformatter.h b/sources/test/testnoformatter.h
index 26c01aa..1b43309 100644
--- a/sources/test/testnoformatter.h
+++ b/sources/test/testnoformatter.h
@@ -39,7 +39,6 @@ private slots:
     void test_copy();
 
 private:
-    QString generateRandomString();
     AWNoFormatter *formatter = nullptr;
 };