tests: Make float and framebuf tests skip or run on big-endian archs.

Signed-off-by: Damien George <damien@micropython.org>

tests/extmod/framebuf16.py

@@ -1,9 +1,14 @@
 try:
-    import framebuf
+    import framebuf, usys
 except ImportError:
     print("SKIP")
     raise SystemExit
 
+# This test and its .exp file is based on a little-endian architecture.
+if usys.byteorder != "little":
+    print("SKIP")
+    raise SystemExit
+
 
 def printbuf():
     print("--8<--")

tests/extmod/framebuf_subclass.py

@@ -1,11 +1,16 @@
 # test subclassing framebuf.FrameBuffer
 
 try:
-    import framebuf
+    import framebuf, usys
 except ImportError:
     print("SKIP")
     raise SystemExit
 
+# This test and its .exp file is based on a little-endian architecture.
+if usys.byteorder != "little":
+    print("SKIP")
+    raise SystemExit
+
 
 class FB(framebuf.FrameBuffer):
     def __init__(self, n):

tests/float/bytes_construct_endian.py

@@ -1,4 +1,4 @@
-# test construction of bytearray from array with float type
+# test construction of bytes from array with float type
 
 try:
     from uarray import array

tests/float/float_array.py

@@ -22,4 +22,4 @@ def test(a):
 test(array("f"))
 test(array("d"))
 
-print("{:.4f}".format(array("f", b"\xcc\xcc\xcc=")[0]))
+print("{:.4f}".format(array("f", bytes(array("I", [0x3DCCCCCC])))[0]))