Test coverage: make LCOV ignore code unreachable without interactive shell

misc.c

@@ -252,7 +252,10 @@ char* get_input()
             input = NULL;
             size_t n = 0;
             if (isatty(0))
+            // LCOV_EXCL_START
+            // Should be unreachable in tests, as they will use a non-interactive shell.
                 printf("%s", input_prompt);
+            // LCOV_EXCL_STOP 
             IGNORE(getline(&input, &n, stdin));
         }
 
@@ -290,8 +293,11 @@ bool yes(const char* question, const char* yes_response, const char* no_response
 
         reply = get_input();
         if (reply == NULL) {
+            // LCOV_EXCL_START
+            // Should be unreachable. Reply should never be NULL
             linenoiseFree(reply);
             exit(EXIT_SUCCESS);
+            // LCOV_EXCL_STOP 
         }
 
         char* firstword = (char*) xmalloc(strlen(reply)+1);