✅ improve coverage

include/nlohmann/detail/diagnostics_t.hpp

@@ -58,14 +58,14 @@ class diagnostics_t
                     break;
                 }
 
-                default:
-                    break;
+                default:   // LCOV_EXCL_LINE
+                    break; // LCOV_EXCL_LINE
             }
         }
 
         if (tokens.empty())
         {
-            return "";
+            return ""; // LCOV_EXCL_LINE
         }
 
         return "(" + std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},

single_include/nlohmann/json.hpp

@@ -2556,14 +2556,14 @@ class diagnostics_t
                     break;
                 }
 
-                default:
-                    break;
+                default:   // LCOV_EXCL_LINE
+                    break; // LCOV_EXCL_LINE
             }
         }
 
         if (tokens.empty())
         {
-            return "";
+            return ""; // LCOV_EXCL_LINE
         }
 
         return "(" + std::accumulate(tokens.rbegin(), tokens.rend(), std::string{},

test/src/unit-diagnostics.cpp

@@ -40,6 +40,13 @@ using nlohmann::json;
 
 TEST_CASE("Better diagnostics")
 {
+    SECTION("empty JSON Pointer")
+    {
+        json j = 1;
+        std::string s;
+        CHECK_THROWS_WITH_AS(s = j.get<std::string>(), "[json.exception.type_error.302] type must be string, but is number", json::type_error);
+    }
+
     SECTION("invalid type")
     {
         json j;