tests/float: Adjust float-parsing tests to pass with only a small error.

dpgeorge · dpgeorge · commit 6dad0885692f · 2018-02-26T15:54:03.000+11:00
Float parsing (both single and double precision) may have a relative error
of order the floating point precision, so adjust tests to take this into
account by not printing all of the digits of the answer.
diff --git a/tests/float/float_parse.py b/tests/float/float_parse.py
@@ -7,9 +7,8 @@
 print(float('1.015625') - float('1015625e-6'))
 
 # very large integer part with a very negative exponent should cancel out
-print(float('9' * 60 + 'e-60'))
-print(float('9' * 60 + 'e-40'))
-print(float('9' * 60 + 'e-20') == float('1e40'))
+print('%.4e' % float('9' * 60 + 'e-60'))
+print('%.4e' % float('9' * 60 + 'e-40'))
 
 # many fractional digits
 print(float('.' + '9' * 70))
diff --git a/tests/float/float_parse_doubleprec.py b/tests/float/float_parse_doubleprec.py
@@ -11,9 +11,9 @@
 print(float('.' + '9' * 400 + 'e-100'))
 
 # tiny fraction with large exponent
-print(float('.' + '0' * 400 + '9e100'))
-print(float('.' + '0' * 400 + '9e200'))
-print(float('.' + '0' * 400 + '9e400'))
+print('%.14e' % float('.' + '0' * 400 + '9e100'))
+print('%.14e' % float('.' + '0' * 400 + '9e200'))
+print('%.14e' % float('.' + '0' * 400 + '9e400'))
 
 # ensure that accuracy is retained when value is close to a subnormal
 print(float('1.00000000000000000000e-307'))
