1 files changed, 120 insertions, 0 deletions
diff --git a/tests/basics/string_format.py b/tests/basics/string_format.py
new file mode 100644
index 0000000000..84ea054758
--- /dev/null
+++ b/tests/basics/string_format.py
@@ -0,0 +1,120 @@
+# Change the following to True to get a much more comprehensive set of tests
+# to run, albeit, which take considerably longer.
+
+full_tests = False
+
+def test(fmt, *args):
+    print('{:8s}'.format(fmt) + '>' +  fmt.format(*args) + '<')
+
+test("{}-{}", 1, [4, 5])
+test("{0}-{1}", 1, [4, 5])
+test("{1}-{0}", 1, [4, 5])
+test("{:x}", 1)
+test("{!r}", 2)
+test("{:x}", 0x10)
+test("{!r}", "foo")
+test("{!s}", "foo")
+test("{0!r:>10s} {0!s:>10s}", "foo")
+
+test("{:4b}", 10)
+test("{:4c}", 48)
+test("{:4d}", 123)
+test("{:4n}", 123)
+test("{:4o}", 123)
+test("{:4x}", 123)
+test("{:4X}", 123)
+
+test("{:4,d}", 12345678)
+
+test("{:#4b}", 10)
+test("{:#4o}", 123)
+test("{:#4x}", 123)
+test("{:#4X}", 123)
+
+test("{:#4d}", 0)
+test("{:#4b}", 0)
+test("{:#4o}", 0)
+test("{:#4x}", 0)
+test("{:#4X}", 0)
+
+test("{:<6s}", "ab")
+test("{:>6s}", "ab")
+test("{:^6s}", "ab")
+
+test("{: <6d}", 123)
+test("{: <6d}", -123)
+test("{:0<6d}", 123)
+test("{:0<6d}", -123)
+test("{:@<6d}", 123)
+test("{:@<6d}", -123)
+
+test("{:@< 6d}", 123)
+test("{:@< 6d}", -123)
+test("{:@<+6d}", 123)
+test("{:@<+6d}", -123)
+test("{:@<-6d}", 123)
+test("{:@<-6d}", -123)
+
+test("{:@>6d}",  -123)
+test("{:@<6d}",  -123)
+test("{:@=6d}",  -123)
+test("{:06d}",  -123)
+
+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)
+
+# TODO Add tests for erroneous format strings.