implementation of unit test for to_string()

tests/test/test_StringManipulation.c

@@ -0,0 +1,38 @@
+#include "unity.h"
+#include "StringManipulation.h"
+
+void test_to_string() 
+{
+	/*initializing test values*/
+	char *result_1[] = {"0","1","2","3","4","5","6","7","8","9","10"};
+	char *result_2[] = {"500","502","504","506","508","510","512","514","516","518"};
+	char *result_3[] = {"1000","2000","3000","4000","5000","6000","7000","8000","9000","10000"};
+	char *result_4[] = {"9999","8999","7999","6999","5999","4999","3999","2999","1999","999"};
+	char *result_5[] = {"1000000","2000000","3000000","4000000","5000000","6000000","7000000",
+			    "8000000","9000000","10000000"};
+
+	for(int i=0;i<=10;++i){
+		printf("%s\n", to_string(i));
+		TEST_ASSERT_EQUAL_STRING(result_1[i],to_string(i));
+	}	
+	
+	for(int i=0, j=500;i<10;++i,j+=2){
+		printf("%s\n", to_string(j));
+		TEST_ASSERT_EQUAL_STRING(result_2[i],to_string(j));
+	}
+
+	for(int i=0, j=1000;i<10;++i,j+=1000){
+		printf("%s\n", to_string(j));
+		TEST_ASSERT_EQUAL_STRING(result_3[i],to_string(j));	
+	}
+	
+	for(int i=0, j=9999;i<10;++i,j-=1000){
+		printf("%s\n", to_string(j));
+		TEST_ASSERT_EQUAL_STRING(result_4[i], to_string(j));
+	}
+	for(int i=0, j=1000000;i<10;++i,j+=1000000){
+		printf("%s\n", to_string(j));
+		TEST_ASSERT_EQUAL_STRING(result_5[i],to_string(j));
+	}
+
+}