Test Stream::parseFloat() with a huge number of digits

edgar-bonet · edgar-bonet · commit 91c5e2985335 · 2021-01-25T13:48:26.000+01:00
Give a 311-digit number to Stream::parseFloat(). This makes the local
variable `value' overflow to infinity. With so many digits, the number
cannot be parsed into an integer, not even into an integer stored as a
`double'.

Note that 40 digits would be enough to unveil this issue on AVR.
diff --git a/test/src/Stream/test_parseFloat.cpp b/test/src/Stream/test_parseFloat.cpp
@@ -47,7 +47,7 @@ TEST_CASE ("Testing parseFloat(LookaheadMode lookahead = SKIP_ALL, char ignore =
   }
   WHEN ("A float is provided with too many digits after the decimal point")
   {
-    mock << "3.1415926535897932384";
+    mock << "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870064";
     REQUIRE(mock.parseFloat() == Approx(3.141592654f));
   }
   WHEN ("A float is larger than LONG_MAX")

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,7 @@ TEST_CASE ("Testing parseFloat(LookaheadMode lookahead = SKIP_ALL, char ignore =`
`47`	`47`	`}`
`48`	`48`	`WHEN ("A float is provided with too many digits after the decimal point")`
`49`	`49`	`{`
`50`		`- mock << "3.1415926535897932384";`
	`50`	`+ mock << "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870064";`
`51`	`51`	`REQUIRE(mock.parseFloat() == Approx(3.141592654f));`
`52`	`52`	`}`
`53`	`53`	`WHEN ("A float is larger than LONG_MAX")`