✅ add tests to improve coverage

include/nlohmann/detail/input/binary_reader.hpp

@@ -1578,7 +1578,7 @@ class binary_reader
             }
 
             default:           // LCOV_EXCL_LINE
-                assert(false);  // LCOV_EXCL_LINE
+                return false;  // LCOV_EXCL_LINE
         }
     }
 

include/nlohmann/detail/output/binary_writer.hpp

@@ -1092,9 +1092,7 @@ class binary_writer
         }
         write_number(subtype);
 
-        oa->write_characters(
-            reinterpret_cast<const CharType*>(value.data()),
-            value.size());
+        oa->write_characters(reinterpret_cast<const CharType*>(value.data()), value.size());
     }
 
     /*!

single_include/nlohmann/json.hpp

@@ -7105,7 +7105,7 @@ class binary_reader
             }
 
             default:           // LCOV_EXCL_LINE
-                assert(false);  // LCOV_EXCL_LINE
+                return false;  // LCOV_EXCL_LINE
         }
     }
 
@@ -13041,9 +13041,7 @@ class binary_writer
         }
         write_number(subtype);
 
-        oa->write_characters(
-            reinterpret_cast<const CharType*>(value.data()),
-            value.size());
+        oa->write_characters(reinterpret_cast<const CharType*>(value.data()), value.size());
     }
 
     /*!

test/src/unit-json_pointer.cpp

@@ -101,6 +101,9 @@ TEST_CASE("JSON pointers")
             CHECK(j["/foo/1"_json_pointer] == j["foo"][1]);
             CHECK(j.contains(json::json_pointer("/foo/0")));
             CHECK(j.contains(json::json_pointer("/foo/1")));
+            CHECK(not j.contains(json::json_pointer("/foo/3")));
+            CHECK(not j.contains(json::json_pointer("/foo/+")));
+            CHECK(not j.contains(json::json_pointer("/foo/1+2")));
             CHECK(not j.contains(json::json_pointer("/foo/-")));
 
             // checked array access

test/src/unit-regression.cpp

@@ -464,6 +464,11 @@ TEST_CASE("regression tests")
         s2 = o["name"];
 
         CHECK(s2 == "value");
+
+        // improve coverage
+        o["int"] = 1;
+        CHECK_THROWS_AS(s2 = o["int"], json::type_error);
+        CHECK_THROWS_WITH(s2 = o["int"], "[json.exception.type_error.302] type must be string, but is number");
     }
 
     SECTION("issue #146 - character following a surrogate pair is skipped")