Add unit tests

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+HOW TO USE
+
+You can use CuTest to create unit tests to drive your development
+in the style of Extreme Programming. You can also add unit tests to
+existing code to ensure that it works as you suspect.
+
+Your unit tests are an investment. They let you to change your
+code and add new features confidently without worrying about
+accidentally breaking earlier features.
+
+
+LICENSING
+
+For details on licensing see license.txt.
+
+
+GETTING STARTED
+
+To add unit testing to your C code the only files you need are
+CuTest.c and CuTest.h. 
+
+CuTestTest.c and AllTests.c have been included to provide an
+example of how to write unit tests and then how to aggregate them
+into suites and into a single AllTests.c file. Suites allow you
+to put group tests into logical sets. AllTests.c combines all the
+suites and runs them. 
+
+You should not have to look inside CuTest.c. Looking in
+CuTestTest.c and AllTests.c (for example usage) should be
+sufficient. 
+
+After downloading the sources, run your compiler to create an
+executable called AllTests.exe. For example, if you are using
+Windows with the cl.exe compiler you would type: 
+
+    cl.exe AllTests.c CuTest.c CuTestTest.c
+    AllTests.exe
+
+This will run all the unit tests associated with CuTest and print
+the output on the console. You can replace cl.exe with gcc or
+your favorite compiler in the command above.
+
+
+DETAILED EXAMPLE
+
+Here is a more detailed example. We will work through a simple
+test first exercise. The goal is to create a library of string
+utilities. First, lets write a function that converts a
+null-terminated string to all upper case.
+
+Ensure that CuTest.c and CuTest.h are accessible from your C
+project. Next, create a file called StrUtil.c with these
+contents:
+
+    #include "CuTest.h"
+    
+    char* StrToUpper(char* str) {
+        return str;
+    }
+    
+    void TestStrToUpper(CuTest *tc) {
+        char* input = strdup("hello world");
+        char* actual = StrToUpper(input);
+        char* expected = "HELLO WORLD";
+        CuAssertStrEquals(tc, expected, actual);
+    }
+   
+    CuSuite* StrUtilGetSuite() {
+        CuSuite* suite = CuSuiteNew();
+        SUITE_ADD_TEST(suite, TestStrToUpper);
+        return suite;
+    }
+    
+Create another file called AllTests.c with these contents:
+
+    #include "CuTest.h"
+    
+    CuSuite* StrUtilGetSuite();
+    
+    void RunAllTests(void) {
+        CuString *output = CuStringNew();
+        CuSuite* suite = CuSuiteNew();
+        
+        CuSuiteAddSuite(suite, StrUtilGetSuite());
+    
+        CuSuiteRun(suite);
+        CuSuiteSummary(suite, output);
+        CuSuiteDetails(suite, output);
+        printf("%s\n", output->buffer);
+    }
+    
+    int main(void) {
+        RunAllTests();
+    }
+
+Then type this on the command line:
+
+    gcc AllTests.c CuTest.c StrUtil.c
+
+to compile. You can replace gcc with your favorite compiler.
+CuTest should be portable enough to handle all Windows and Unix
+compilers. Then to run the tests type:
+
+    a.out
+
+This will print an error because we haven't implemented the
+StrToUpper function correctly. We are just returning the string
+without changing it to upper case. 
+
+    char* StrToUpper(char* str) {
+        return str;
+    }
+
+Rewrite this as follows:
+
+    char* StrToUpper(char* str) {
+        char* p;
+        for (p = str ; *p ; ++p) *p = toupper(*p);
+        return str;
+    }
+
+Recompile and run the tests again. The test should pass this
+time.
+
+
+WHAT TO DO NEXT
+
+At this point you might want to write more tests for the
+StrToUpper function. Here are some ideas:
+
+TestStrToUpper_EmptyString :  pass in ""
+TestStrToUpper_UpperCase   :  pass in "HELLO WORLD"
+TestStrToUpper_MixedCase   :  pass in "HELLO world"
+TestStrToUpper_Numbers     :  pass in "1234 hello"
+
+As you write each one of these tests add it to StrUtilGetSuite
+function. If you don't the tests won't be run. Later as you write
+other functions and write tests for them be sure to include those
+in StrUtilGetSuite also. The StrUtilGetSuite function should
+include all the tests in StrUtil.c
+
+Over time you will create another file called FunkyStuff.c
+containing other functions unrelated to StrUtil. Follow the same
+pattern. Create a FunkyStuffGetSuite function in FunkyStuff.c.
+And add FunkyStuffGetSuite to AllTests.c.
+
+The framework is designed in the way it is so that it is easy to
+organize a lot of tests.
+
+THE BIG PICTURE
+
+Each individual test corresponds to a CuTest. These are grouped
+to form a CuSuite. CuSuites can hold CuTests or other CuSuites.
+AllTests.c collects all the CuSuites in the program into a single
+CuSuite which it then runs as a single CuSuite.
+
+The project is open source so feel free to take a peek under the
+hood at the CuTest.c file to see how it works. CuTestTest.c
+contains tests for CuTest.c. So CuTest tests itself.
+
+Since AllTests.c has a main() you will need to exclude this when
+you are building your product. Here is a nicer way to do this if
+you want to avoid messing with multiple builds. Remove the main()
+in AllTests.c. Note that it just calls RunAllTests(). Instead
+we'll call this directly from the main program.
+
+Now in the main() of the actual program check to see if the
+command line option "--test" was passed. If it was then I call
+RunAllTests() from AllTests.c. Otherwise run the real program.
+
+Shipping the tests with the code can be useful. If you customers
+complain about a problem you can ask them to run the unit tests
+and send you the output. This can help you to quickly isolate the
+piece of your system that is malfunctioning in the customer's
+environment. 
+
+CuTest offers a rich set of CuAssert functions. Here is a list:
+
+void CuAssert(CuTest* tc, char* message, int condition);
+void CuAssertTrue(CuTest* tc, int condition);
+void CuAssertStrEquals(CuTest* tc, char* expected, char* actual);
+void CuAssertIntEquals(CuTest* tc, int expected, int actual);
+void CuAssertPtrEquals(CuTest* tc, void* expected, void* actual);
+void CuAssertPtrNotNull(CuTest* tc, void* pointer);
+
+The project is open source and so you can add other more powerful
+asserts to make your tests easier to write and more concise.
+Please feel free to send me changes you make so that I can
+incorporate them into future releases.
+
+If you see any errors in this document please contact me at
+asimjalis@peakprogramming.com.
+
+
+AUTOMATING TEST SUITE GENERATION
+
+make-tests.sh will grep through all the .c files in the current
+directory and generate the code to run all the tests contained in
+them. Using this script you don't have to worry about writing
+AllTests.c or dealing with any of the other suite code.
+
+
+CREDITS
+
+[02.23.2003] Dave Glowacki <dglo@hyde.ssec.wisc.edu> has added
+(1) file name and line numbers to the error messages, (2)
+AssertDblEquals for doubles, (3) Assert<X>Equals_Msg version of
+all the Assert<X>Equals to pass in optional message which is
+printed out on assert failure.