From ac0c6bcf18efc4854a0bedb8a6541721baeed03a Mon Sep 17 00:00:00 2001
From: prathamesh <pratham_920@yahoo.com>
Date: Fri, 12 Jun 2020 07:42:28 +0530
Subject: [PATCH] Create test cases easily for C CPP

While creating a C or CPP standard function based question,
the standard test case will simply be the assert function of CPP.
This replaces the writing of complete C code and print inputs and
expected output for the user code evaluation.
Now the creator simply needs to write the assert function.
Example: For add function (adding two numbers), the test case will be:

assert(add(1, 2) == 3)
---
 yaksh/cpp_code_evaluator.py                   |  63 ++++----
 .../evaluator_tests/test_c_cpp_evaluation.py  | 135 +-----------------
 yaksh/fixtures/demo_questions.zip             | Bin 9957 -> 2512 bytes
 3 files changed, 40 insertions(+), 158 deletions(-)

diff --git a/yaksh/cpp_code_evaluator.py b/yaksh/cpp_code_evaluator.py
index d249c66d8..96ec15233 100644
--- a/yaksh/cpp_code_evaluator.py
+++ b/yaksh/cpp_code_evaluator.py
@@ -3,6 +3,7 @@
 import os
 from os.path import isfile
 import subprocess
+from textwrap import dedent
 
 # Local imports
 from .file_utils import copy_files, delete_files
@@ -49,16 +50,42 @@ def set_file_paths(self):
 
         return user_output_path, ref_output_path
 
+    def append_test_case_to_answer(self):
+        content = dedent('''
+        {0}
+        #include <cassert>
+        int main(){{
+            {1};
+            return 0;
+        }}
+        '''.format(self.user_answer, self.test_case))
+        return content
+
     def get_commands(self, clean_ref_code_path, user_output_path,
                      ref_output_path):
-        compile_command = 'g++  {0} -c -o {1}'.format(
+        compile_command = 'g++ {0} -c -o {1}'.format(
             self.submit_code_path, user_output_path)
-        compile_main = 'g++ {0} {1} -o {2}'.format(
-            clean_ref_code_path, user_output_path,
-            ref_output_path
+        compile_main = 'g++ {0} -o {1}'.format(
+            clean_ref_code_path, ref_output_path
             )
         return compile_command, compile_main
 
+    def trim_error(self, error_type, error):
+        err = error_type
+        try:
+            error_lines = error.splitlines()
+            for e in error_lines:
+                if ':' in e:
+                    if error_type == 'Assertion Error:':
+                        err = '{0} \n {1}'.format(err, e.split(':')[-1])
+                    else:
+                        err = '{0} \n {1}'.format(err, e.split(':', 1)[1])
+                else:
+                    err = '{0} \n {1}'.format(err, e)
+        except Exception:
+            return '{0} \n {1}'.format(err, main_err)
+        return err
+
     def compile_code(self):
         if self.compiled_user_answer and self.compiled_test_code:
             return None
@@ -67,7 +94,8 @@ def compile_code(self):
             self.test_code_path = self.create_submit_code_file('main.c')
             self.write_to_submit_code_file(self.submit_code_path,
                                            self.user_answer)
-            self.write_to_submit_code_file(self.test_code_path, self.test_case)
+            main_content = self.append_test_case_to_answer()
+            self.write_to_submit_code_file(self.test_code_path, main_content)
             clean_ref_code_path = self.test_code_path
             if self.file_paths:
                 self.files = copy_files(self.file_paths)
@@ -90,7 +118,6 @@ def compile_code(self):
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE
             )
-
             self.compiled_test_code = self._run_command(
                 self.compile_main,
                 shell=True,
@@ -141,31 +168,13 @@ def check_code(self):
                     success, err = True, None
                     mark_fraction = 1.0 if self.partial_grading else 0.0
                 else:
-                    err = "{0} \n {1}".format(stdout, stderr)
+                    err = self.trim_error('Assertion Error:', stderr)
                     raise AssertionError(err)
             else:
-                err = "Test case Error:"
-                try:
-                    error_lines = main_err.splitlines()
-                    for e in error_lines:
-                        if ':' in e:
-                            err = "{0} \n {1}".format(err, e.split(":", 1)[1])
-                        else:
-                            err = "{0} \n {1}".format(err, e)
-                except Exception:
-                        err = "{0} \n {1}".format(err, main_err)
+                err = self.trim_error('Test case Error:', main_err)
                 raise TestCaseError(err)
         else:
-            err = "Compilation Error:"
-            try:
-                error_lines = stdnt_stderr.splitlines()
-                for e in error_lines:
-                    if ':' in e:
-                        err = "{0} \n {1}".format(err, e.split(":", 1)[1])
-                    else:
-                        err = "{0} \n {1}".format(err, e)
-            except Exception:
-                err = "{0} \n {1}".format(err, stdnt_stderr)
+            err = self.trim_error('Compilation Error:', stdnt_stderr)
             raise CompilationError(err)
 
         return success, err, mark_fraction
diff --git a/yaksh/evaluator_tests/test_c_cpp_evaluation.py b/yaksh/evaluator_tests/test_c_cpp_evaluation.py
index 14ed80893..6079abc24 100644
--- a/yaksh/evaluator_tests/test_c_cpp_evaluation.py
+++ b/yaksh/evaluator_tests/test_c_cpp_evaluation.py
@@ -18,40 +18,7 @@ def setUp(self):
         with open(self.f_path, 'wb') as f:
             f.write('2'.encode('ascii'))
         tmp_in_dir_path = tempfile.mkdtemp()
-        self.tc_data = dedent("""
-            #include <stdio.h>
-            #include <stdlib.h>
-
-            extern int add(int, int);
-
-            template <class T>
-
-            void check(T expect, T result)
-            {
-                if (expect == result)
-                {
-                printf("Correct: Expected %d got %d ",expect,result);
-                }
-                else
-                {
-                printf("Incorrect: Expected %d got %d ",expect,result);
-                exit (1);
-               }
-            }
-
-            int main(void)
-            {
-                int result;
-                result = add(0,0);
-                    printf("Input submitted to the function: 0, 0");
-                check(0, result);
-                result = add(2,3);
-                    printf("Input submitted to the function: 2 3");
-                check(5,result);
-                printf("All Correct");
-                return 0;
-            }
-            """)
+        self.tc_data = 'assert(add(2, 3) == 5)'
         self.test_case_data = [{"test_case": self.tc_data,
                                 "test_case_type": "standardtestcase",
                                 "weight": 0.0
@@ -157,33 +124,7 @@ def test_infinite_loop(self):
     def test_file_based_assert(self):
         # Given
         self.file_paths = [(self.f_path, False)]
-        self.tc_data = dedent("""
-            #include <stdio.h>
-            #include <stdlib.h>
-
-            extern int ans();
-
-            template <class T>
-            void check(T expect,T result)
-            {
-                if (expect == result)
-                {
-                printf("Correct: Expected %d got %d ",expect,result);
-                }
-                else
-                {
-                printf("Incorrect: Expected %d got %d ",expect,result);
-                exit (0);
-               }
-            }
-
-            int main(void)
-            {
-                int result;
-                result = ans();
-                check(50, result);
-            }
-            """)
+        self.tc_data = 'assert(ans() == 50)'
         self.test_case_data = [{"test_case": self.tc_data,
                                 "test_case_type": "standardtestcase",
                                 "weight": 0.0
@@ -218,40 +159,7 @@ def test_file_based_assert(self):
 
     def test_incorrect_testcase(self):
         # Given
-        self.tc_data = dedent("""
-            #include <stdio.h>
-            #include <stdlib.h>
-
-            extern int add(int, int);
-
-            template <class T>
-
-            void check(T expect, T result)
-            {
-                if (expect == result)
-                {
-                printf("Correct: Expected %d got %d ",expect,result);
-                }
-                else
-                {
-                printf("Incorrect: Expected %d got %d ",expect,result);
-                exit (1);
-               }
-            }
-
-            int main(void)
-            {
-                int result;
-                result = add(0,0);
-                printf("Input submitted to the function: 0, 0");
-                check(0, result);
-                result = add(2,3);
-                printf("Input submitted to the function: 2 3");
-                check(5,result)
-                printf("All Correct");
-                return 0;
-            }
-            """)
+        self.tc_data = 'assert(add(0, 1) == 1'
         user_answer = dedent("""\
                         int add(int a, int b)
                         {
@@ -828,42 +736,7 @@ def test_assert_with_hook(self):
         # Given
         user_answer = "int add(int a, int b)\n{return a+b;}"
 
-        assert_test_case = dedent("""\
-                          #include <stdio.h>
-                          #include <stdlib.h>
-
-                          extern int add(int, int);
-
-                          template <class T>
-
-                          void check(T expect, T result)
-                          {
-                              if (expect == result)
-                              {
-                              printf("Correct: Expected %d got %d ",
-                                    expect,result);
-                              }
-                              else
-                              {
-                              printf("Incorrect: Expected %d got %d ",
-                                    expect,result);
-                              exit (1);
-                             }
-                          }
-
-                          int main(void)
-                          {
-                              int result;
-                              result = add(0,0);
-                                  printf("Input submitted 0, 0");
-                              check(0, result);
-                              result = add(2,3);
-                                  printf("Input submitted 2 3");
-                              check(5,result);
-                              printf("All Correct");
-                              return 0;
-                          }
-                          """)
+        assert_test_case = 'assert(add(2, 3) == 5)'
 
         hook_code = dedent("""\
                             def check_answer(user_answer):
diff --git a/yaksh/fixtures/demo_questions.zip b/yaksh/fixtures/demo_questions.zip
index 6b0f8526c0d223d667043437a1b378467d5d0d3f..81381b14146bf542e2a6c2bc6c442fe68dd2edcd 100644
GIT binary patch
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