Add test cases for xparser (#47)

Author: tharun571

src/xparser.hpp

@@ -10,10 +10,13 @@
 #ifndef XEUS_CPP_PARSER_HPP
 #define XEUS_CPP_PARSER_HPP
 
+#include "xeus-cpp/xeus_cpp_config.hpp"
+
 #include <string>
 
 namespace xcpp
-{
+{   
+    XEUS_CPP_API
     std::string trim(const std::string& str);
 }
 #endif

test/test_interpreter.cpp

@@ -12,6 +12,8 @@
 #include "xeus-cpp/xmanager.hpp"
 #include "xeus-cpp/xutils.hpp"
 
+#include "../src/xparser.hpp"
+
 TEST_SUITE("execute_request")
 {
     TEST_CASE("fetch_documentation")
@@ -50,6 +52,37 @@ TEST_SUITE("extract_filename")
     }
 }
 
+TEST_SUITE("trim"){
+
+    TEST_CASE("trim_basic_test"){
+        std::string argument = "argument";
+
+        std::string result = xcpp::trim(argument);
+
+        REQUIRE(result == "argument");
+    }
+
+    /*Checks if it trims the string which 
+    has an empty space at the start and in the end*/
+    TEST_CASE("trim_start_and_end"){
+        std::string argument = " argument ";
+
+        std::string result = xcpp::trim(argument);
+
+        REQUIRE(result == "argument");
+    }
+
+    /*Checks if it trims the string which has no characters*/
+    TEST_CASE("trim_empty"){
+        std::string argument = "  ";
+
+        std::string result = xcpp::trim(argument);
+
+        REQUIRE(result == "");
+    }
+
+}
+
 TEST_SUITE("should_print_version")
 {
     // This test case checks if the function `should_print_version` correctly identifies