tests/basics: Add more tuple tests to improve coverage testing.

tests/basics/tuple1.py

@@ -16,3 +16,18 @@ print(x[:-1])
 print(x[2:3])
 
 print(x + (10, 100, 10000))
+
+# construction of tuple from large iterator (tests implementation detail of uPy)
+print(tuple(range(20)))
+
+# unsupported unary operation
+try:
+    +()
+except TypeError:
+    print('TypeError')
+
+# unsupported type on RHS of add
+try:
+    () + None
+except TypeError:
+    print('TypeError')