Improve comments and assertion messages

test/built-ins/Temporal/Duration/prototype/round/relativeto-zoneddatetime-nanoseconds-to-days-range-errors.js

@@ -54,7 +54,8 @@ assert.throws(RangeError, () =>
   oneNsDuration.round({
     relativeTo: zdt,
     smallestUnit: "days",
-  })
+  }),
+  "RangeError when days < 0 and sign = 1"
 );
 
 // NanosecondsToDays.20: days > 0 and sign = -1
@@ -74,7 +75,8 @@ assert.throws(RangeError, () =>
   negOneNsDuration.round({
     relativeTo: zdt,
     smallestUnit: "days",
-  })
+  }),
+  "RangeError when days > 0 and sign = -1"
 );
 
 // NanosecondsToDays.22: nanoseconds > 0 and sign = -1
@@ -93,9 +95,10 @@ zdt = new Temporal.ZonedDateTime(
   )
 );
 assert.throws(RangeError, () =>
-  // Using -1ns duration sets _nanoseocnds_ to -1 and _sign_ to -1
+  // Using -1ns duration sets _nanoseconds_ to -1 and _sign_ to -1
   negOneNsDuration.round({
     relativeTo: zdt,
     smallestUnit: "days",
-  })
+  }),
+  "RangeError when nanoseconds > 0 and sign = -1"
 );

test/built-ins/Temporal/Duration/prototype/total/relativeto-zoneddatetime-nanoseconds-to-days-range-errors.js

@@ -53,7 +53,8 @@ assert.throws(RangeError, () =>
   oneNsDuration.total({
     relativeTo: zdt,
     unit: "day",
-  })
+  }),
+  "RangeError when days < 0 and sign = 1"
 );
 
 // NanosecondsToDays.20: days > 0 and sign = -1
@@ -72,7 +73,8 @@ assert.throws(RangeError, () =>
   negOneNsDuration.total({
     relativeTo: zdt,
     unit: "day",
-  })
+  }),
+  "RangeError when days > 0 and sign = -1"
 );
 
 // NanosecondsToDays.22: nanoseconds > 0 and sign = -1
@@ -94,5 +96,6 @@ assert.throws(RangeError, () =>
   negOneNsDuration.total({
     relativeTo: zdt,
     unit: "day",
-  })
+  }),
+  "RangeError when nanoseconds > 0 and sign = -1"
 );