Implement ffi.from_buffer("foo[]", x)

Also contains some improvements to the documentation about other recent
additions

1 files changed, 9 insertions, 3 deletions

diff --git a/testing/cffi0/test_ffi_backend.py b/testing/cffi0/test_ffi_backend.py
index 4b43074..12ecaee 100644
--- a/testing/cffi0/test_ffi_backend.py
+++ b/testing/cffi0/test_ffi_backend.py
@@ -324,16 +324,22 @@ class TestBitfield:
         a = array.array('H', [10000, 20000, 30000])
         c = ffi.from_buffer(a)
         assert ffi.typeof(c) is ffi.typeof("char[]")
+        assert len(c) == 6
         ffi.cast("unsigned short *", c)[1] += 500
         assert list(a) == [10000, 20500, 30000]
-        assert c == ffi.from_buffer(a, True)
+        assert c == ffi.from_buffer("char[]", a, True)
         assert c == ffi.from_buffer(a, require_writable=True)
         #
+        c = ffi.from_buffer("unsigned short[]", a)
+        assert len(c) == 3
+        assert c[1] == 20500
+        #
         p = ffi.from_buffer(b"abcd")
         assert p[2] == b"c"
         #
-        assert p == ffi.from_buffer(b"abcd", False)
-        py.test.raises((TypeError, BufferError), ffi.from_buffer, b"abcd", True)
+        assert p == ffi.from_buffer(b"abcd", require_writable=False)
+        py.test.raises((TypeError, BufferError), ffi.from_buffer,
+                                                 "char[]", b"abcd", True)
         py.test.raises((TypeError, BufferError), ffi.from_buffer, b"abcd",
                                                  require_writable=True)