tests: Add a few tests for bool, bytearray, float to improve coverage.

tests/basics/bool1.py

@@ -9,3 +9,9 @@ print(False or True)
 # unary operators
 print(+True)
 print(-True)
+
+# unsupported unary op
+try:
+    len(False)
+except TypeError:
+    print('TypeError')

tests/basics/bytearray1.py

@@ -27,4 +27,7 @@ print(bytearray([1]) == b"1")
 print(b"1" == bytearray([1]))
 print(bytearray() == bytearray())
 
+# comparison with other type should return False
+print(bytearray() == 1)
+
 # TODO: other comparisons

tests/basics/bytearray_add.py

@@ -12,3 +12,7 @@ print(b)
 # extend
 b.extend(bytearray(4))
 print(b)
+
+# this inplace add tests the code when the buffer doesn't need to be increased
+b = bytearray()
+b += b''

tests/float/float_divmod_relaxed.py

@@ -25,3 +25,9 @@ for i in range(25):
     for j in range(25):
         y = (j - 12.5) / 6
         test(x, y)
+
+# test division by zero error
+try:
+    divmod(1.0, 0)
+except ZeroDivisionError:
+    print('ZeroDivisionError')