Put in unit tests to catch parser failure

Noticed that the reader could over-consume “NaN” if token terminated in
the middle.

Author: StilesCrisis

test/unittest/readertest.cpp

@@ -1832,6 +1832,10 @@ TEST(Reader, ParseNanAndInfinity) {
     TEST_NAN_INF("Infinity", inf);
     TEST_NAN_INF("-Inf", -inf);
     TEST_NAN_INF("-Infinity", -inf);
+    TEST_NAN_INF_ERROR(kParseErrorValueInvalid, "NInf", 1);
+    TEST_NAN_INF_ERROR(kParseErrorValueInvalid, "NaInf", 1);
+    TEST_NAN_INF_ERROR(kParseErrorValueInvalid, "INan", 1);
+    TEST_NAN_INF_ERROR(kParseErrorValueInvalid, "InNan", 1);
     TEST_NAN_INF_ERROR(kParseErrorValueInvalid, "nan", 1);
     TEST_NAN_INF_ERROR(kParseErrorValueInvalid, "-nan", 1);
     TEST_NAN_INF_ERROR(kParseErrorValueInvalid, "NAN", 1);