Added a test for a simple loop

.gitignore

@@ -3,4 +3,5 @@ exec/
 cmake*/*
 .idea/
 venv/
-lbuild/
+lbuild/
+/programs.txt

blackbox_test.py

@@ -29,14 +29,14 @@ def test_program(program_name, expected_output):
     if not isinstance(received_output, str):
         received_output = received_output.decode("utf-8")
 
-    print("testing '" + program_name + "'... ", end="")
+    print("testing '{}'... ".format(program_name), end="")
 
     if expected_output == received_output:
         print("passed")
 
         return 0
     else:
-        print("failed! '" + received_output + "' != '" + expected_output + "'")
+        print("failed! '{}' != '{}'".format(received_output, expected_output))
 
         return 1
 
@@ -49,11 +49,12 @@ def main():
     """
 
     failed_tests = 0
-    failed_tests += test_program("hello_world", "hello world! \n")
+    failed_tests += test_program("hello_world", "hello world!\n")
+    failed_tests += test_program("loop", "*")
     # TODO: Add more test cases here...
 
     if failed_tests:
-        print("Errors: Failed '" + str(failed_tests) + "' tests!")
+        print("Errors: Failed '{}' tests!".format(str(failed_tests)))
     else:
         print("All tests passed!")
 
@@ -77,7 +78,7 @@ def main():
         mbvm_exec = mbvm_unix_exec
 
 if not mbvm_exec:
-    sys.stderr.write("ERROR: Could not find the mbvm executable.")
+    sys.stderr.write("ERROR: Could not find the mbvm executable")
     sys.exit(1)
 
 if __name__ == "__main__":

src/instructions/instructions.c

@@ -600,6 +600,7 @@ void instr_jmp(struct instruction ic)
     // TODO: add the other jump modes
     mem_addr = get_dword(ram, incr_pc());
 
+    // TODO: I don't think this will always be true
     if ((mem_addr % INSTRUCTION_SIZE) == 0)
     {
         switch (ic.mode)

src/mbvm.c

@@ -58,7 +58,7 @@ int parse_args(int argc, const char *argv[])
 int main(int argc, const char *argv[])
 {
     if (parse_args(argc, argv) != 0)
-        return 1;
+        return EXIT_FAILURE;
 
     // Create the virtual machine in RAM
     // TODO: Take VM init values as command line arguments
@@ -69,13 +69,13 @@ int main(int argc, const char *argv[])
     if (0 != load_file(file_name))
     {
         printf("ERROR: Failed to open file '%s'.", file_name);
-        return 1;
+        return EXIT_FAILURE;
     }
 
     // Pass the program to the virtual machine and begin executing
     exec_program();
     // Free all the memory we allocated
     deallocate_vm();
 
-    return 0;
+    return EXIT_SUCCESS;
 }