diff --git a/tests/src/unit-json_view_builder.cpp b/tests/src/unit-json_view_builder.cpp
index 4d2d3ffd8..ad44e9bc3 100644
--- a/tests/src/unit-json_view_builder.cpp
+++ b/tests/src/unit-json_view_builder.cpp
@@ -227,6 +227,17 @@ TEST_CASE("json_view builder")
         {
             check_same(text);
         }
+
+        // the midpoint between the largest double and 2^1024 rounds to
+        // infinity (an overflow), one less to the largest double: with more
+        // than 19 digits, the fast conversions cannot decide these, and the
+        // overflow check falls back to strtod
+        const std::string midpoint = "179769313486231580793728971405303415079934132710037826936173778980444968292764750946649017977587207096330286416692887910946555547851940402630657488671505820681908902000708383676273854845817711531764475730270069855571366959622842914819860834936475292719074168444365510704342711559699508093042880177904174497792";
+        const std::string below = "179769313486231580793728971405303415079934132710037826936173778980444968292764750946649017977587207096330286416692887910946555547851940402630657488671505820681908902000708383676273854845817711531764475730270069855571366959622842914819860834936475292719074168444365510704342711559699508093042880177904174497791";
+        check_same(midpoint);
+        check_same("-" + midpoint);
+        check_same(below);
+        check_same("[" + below + "," + midpoint + "]");
     }
 
     SECTION("malformed input")