diff --git a/manualtest.cpp b/manualtest.cpp
index a05dc2a..04db37d 100644
--- a/manualtest.cpp
+++ b/manualtest.cpp
@@ -1,30 +1,121 @@
 #include<iostream>
 #include<sstream>
 #include<cstring>
+#include <type_traits>
 #include"String.h"
 
 
 
+/* This is a demonstration, that the String class and it's components work
+ * correctly, basically a non-unit test. */
 int main()
 {
-    String str1;
+    if (std::is_default_constructible<String>::value)
+        std::cout << "class String is default constructible" << std::endl;
+    if (std::is_constructible<String, const char*>::value)
+        std::cout << "class String is constructible from const char*" << std::endl;
+    if (std::is_copy_constructible<String>::value)
+        std::cout << "class String is copy constructible" << std::endl;
+    if (std::is_copy_assignable<String>::value)
+        std::cout << "class String is copy assignable" << std::endl;
+    if (std::is_move_constructible<String>::value)
+        std::cout << "class String is move constructible" << std::endl;
+    if (std::is_move_assignable<String>::value)
+        std::cout << "class String is move assignable" << std::endl;
+
+
+    std::cout << std::endl;
+
+
+    String str("cica");
+    if (!std::strcmp(str.c_str(), "cica"))
+        std::cout << "String::c_str() method works" << std::endl;
+
+    String uninitialized;
+    try { uninitialized.c_str(); }
+    catch (std::runtime_error)
+    { std::cout << "String::c_str() throws if String is not initialized" << std::endl; }
+
+
+    std::cout << std::endl;
+
+
+    String sajt("sajt");
+    if (!std::strcmp((str+sajt).c_str(), "cicasajt"))
+        std::cout << "String::operator+ works with other Strings" << std::endl;
+
+    String cica(str);
+    cica += sajt;
+    if (!std::strcmp(cica.c_str(), "cicasajt"))
+        std::cout << "String::operator+= works with other Strings" << std::endl;
+
+    String cica1("cicá");
+    if (!std::strcmp((cica1+'k').c_str(), "cicák"))
+        std::cout << "String::operator+ works with char primitives" << std::endl;
+
+    cica1 += 'k';
+    if (!std::strcmp(cica1.c_str(), "cicák"))
+        std::cout << "String::operator+= works with char primitives" << std::endl;
+
+
+    std::cout << std::endl;
+
+
+    String sajt1(sajt);
+    if (sajt == sajt1)
+        std::cout << "String::operator== works" << std::endl;
+
+    try { uninitialized == sajt; }
+    catch (std::runtime_error)
+    { std::cout << "String::operator== throws if String is not initialized" << std::endl; }
+
+
+    std::cout << std::endl;
+
+
+    if (str[1] == 'i')
+        std::cout << "String::operator[] works" << std::endl;
+
+    try { str[8]; }
+    catch (std::out_of_range)
+    { std::cout << "String::operator[] throws when index is out of range" << std::endl; }
+
+    try { uninitialized[0]; }
+    catch (std::runtime_error)
+    { std::cout << "String::operator[] throws when String is not initialized" << std::endl; }
+
+
+    std::cout << std::endl;
+
+
+    String tej("tej");
+    String tej1 = tej;
+    tej1[0] = 's';
+    if (!std::strcmp(tej.c_str(), "tej") && !std::strcmp(tej1.c_str(), "sej"))
+        std::cout << "Copy-on-write works when indexing Strings" << std::endl;
+
+    String lel("lel");
+    String lel1("lel");
+
+    if (lel.c_str() == lel1.c_str())
+        std::cout << "Resource sharing works on Strings" << std::endl;
+
+
+    std::cout << std::endl;
+
+
     std::stringstream stream;
-    stream << "sajt";
-    stream >> str1;
-    std::cout << str1 << std::endl;
-    String str2(" cicasajt");
-    String str3(str2);
-    str2 = str1;
-    String str4(String("sajtos cica"));
-    str2 = String(" tihihi");
-    std::cout << str4 + str3 << std::endl;
-    std::cout << ((str4 + str3)+=str2) << std::endl;
-    str4 += 'k';
-    std::cout << str4 << std::endl;
-    std::cout << str2+'k' << std::endl;
-    std::cout << str4[0] << static_cast<const String>(str2)[1] << std::endl;
-    String str5 = str2;
-    str5[0] = 'i';
-    std::cout << str5 << std::endl;
-    std::cout << str2 << std::endl;
+    stream << lel;
+    if (!std::strcmp(stream.str().c_str(), lel.c_str()))
+        std::cout << "ostream operator<< works on Strings" << std::endl;
+
+    stream = std::stringstream();
+
+    stream << "C++11";
+    stream >> uninitialized;
+    if (!std::strcmp(uninitialized.c_str(), "C++11"))
+        std::cout << "istream operator>> works on Strings" << std::endl;
+
+
+    return EXIT_SUCCESS;
 }
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