tests: Use read() instead of readall().

tests/io/file1.py

@@ -37,7 +37,7 @@ except OSError:
     print('OSError')
 f.close()
 
-# readall() error (call read() for compat with CPy)
+# read() w/o args error
 f = open('io/data/file1', 'ab')
 try:
     f.read()

tests/wipy/os.py

@@ -38,7 +38,7 @@ n_w = f.write(test_bytes)
 print(n_w == len(test_bytes))
 f.close()
 f = open('test.txt', 'r')
-r = bytes(f.readall(), 'ascii')
+r = bytes(f.read(), 'ascii')
 # check that we can write and read it correctly
 print(r == test_bytes)
 f.close()
@@ -65,7 +65,7 @@ n_w = f.write(test_bytes)
 print(n_w == len(test_bytes))
 f.close()
 f = open('test.txt', 'r')
-r = bytes(f.readall(), 'ascii')
+r = bytes(f.read(), 'ascii')
 # check that we can write and read it correctly
 print(r == test_bytes)
 f.close()

tests/wipy/uart.py

@@ -72,7 +72,7 @@ print(uart1.readline() == b'1234567890')
 print(uart1.any() == 0)
 
 uart0.write(b'1234567890')
-print(uart1.readall() == b'1234567890')
+print(uart1.read() == b'1234567890')
 
 # tx only mode
 uart0 = UART(0, 1000000, pins=('GP12', None))