tests: Split large tests into smaller files, to run with a small heap.

All tests in basics/ directory can now run and pass using 64-bit unix
port with only a 16k heap (./run-tests --heapsize 16k).  Tests in this
directory should remain small so they can be used for ports with a
small heap.

tests/basics/string_format.py

@@ -1,7 +1,4 @@
-# Change the following to True to get a much more comprehensive set of tests
-# to run, albeit, which take considerably longer.
-
-full_tests = False
+# basic functionality test for {} format string
 
 def test(fmt, *args):
     print('{:8s}'.format(fmt) + '>' +  fmt.format(*args) + '<')
@@ -77,151 +74,3 @@ print("{text:{align}{width}}".format(text="foo", align=">", width=30))
 print("{foo}/foo".format(foo="bar"))
 print("{}".format(123, foo="bar"))
 print("{}-{foo}".format(123, foo="bar"))
-
-def test_fmt(conv, fill, alignment, sign, prefix, width, precision, type, arg):
-    fmt = '{'
-    if conv:
-        fmt += '!'
-        fmt += conv
-    fmt += ':'
-    if alignment:
-        fmt += fill
-        fmt += alignment
-    fmt += sign
-    fmt += prefix
-    fmt += width
-    if precision:
-        fmt += '.'
-        fmt += precision
-    fmt += type
-    fmt += '}'
-    test(fmt,  arg)
-    if fill == '0' and alignment == '=':
-        fmt = '{:'
-        fmt += sign
-        fmt += prefix
-        fmt += width
-        if precision:
-            fmt += '.'
-            fmt += precision
-        fmt += type
-        fmt += '}'
-        test(fmt, arg)
-
-int_nums = (-1234, -123, -12, -1, 0, 1, 12, 123, 1234, True, False)
-int_nums2 = (-12, -1, 0, 1, 12, True, False)
-
-if full_tests:
-    for type in ('', 'b', 'd', 'o', 'x', 'X'):
-        for width in ('', '1', '3', '5', '7'):
-            for alignment in ('', '<', '>', '=', '^'):
-                for fill in ('', ' ', '0', '@'):
-                    for sign in ('', '+', '-', ' '):
-                        for prefix in ('', '#'):
-                            for num in int_nums:
-                                test_fmt('', fill, alignment, sign, prefix, width, '', type, num)
-
-if full_tests:
-    for width in ('', '1', '2'):
-        for alignment in ('', '<', '>', '^'):
-            for fill in ('', ' ', '0', '@'):
-                test_fmt('', fill, alignment, '', '', width, '', 'c', 48)
-
-if full_tests:
-    for conv in ('', 'r', 's'):
-        for width in ('', '1', '4', '10'):
-            for alignment in ('', '<', '>', '^'):
-                for fill in ('', ' ', '0', '@'):
-                    for str in ('', 'a', 'bcd', 'This is a test with a longer string'):
-                        test_fmt(conv, fill, alignment, '', '', width, '', 's', str)
-
-# tests for errors in format string
-
-try:
-    '{0:0}'.format('zzz')
-except (ValueError):
-    print('ValueError')
-
-try:
-    '{1:}'.format(1)
-except IndexError:
-    print('IndexError')
-
-try:
-    '}'.format('zzzz')
-except ValueError:
-    print('ValueError')
-
-# end of format parsing conversion specifier
-try:
-    '{!'.format('a')
-except ValueError:
-    print('ValueError')
-
-# unknown conversion specifier
-try:
-    'abc{!d}'.format('1')
-except ValueError:
-    print('ValueError')
-
-try:
-    '{abc'.format('zzzz')
-except ValueError:
-    print('ValueError')
-
-# expected ':' after specifier
-try:
-    '{!s :}'.format(2)
-except ValueError:
-    print('ValueError')
-
-try:
-    '{}{0}'.format(1, 2)
-except ValueError:
-    print('ValueError')
-
-try:
-    '{1:}'.format(1)
-except IndexError:
-    print('IndexError')
-
-try:
-    '{ 0 :*^10}'.format(12)
-except KeyError:
-    print('KeyError')
-
-try:
-    '{0}{}'.format(1)
-except ValueError:
-    print('ValueError')
-
-try:
-    '{}{}'.format(1)
-except IndexError:
-    print('IndexError')
-
-try:
-    '{0:+s}'.format('1')
-except ValueError:
-    print('ValueError')
-
-try:
-    '{0:+c}'.format(1)
-except ValueError:
-    print('ValueError')
-
-try:
-    '{0:s}'.format(1)
-except ValueError:
-    print('ValueError')
-
-try:
-    '{:*"1"}'.format('zz')
-except ValueError:
-    print('ValueError')
-
-# unknown format code for str arg
-try:
-    '{:X}'.format('zz')
-except ValueError:
-    print('ValueError')