diff --git a/test/bitwise.cpp b/test/bitwise.cpp
index f1d4fd46..2d0fabee 100644
--- a/test/bitwise.cpp
+++ b/test/bitwise.cpp
@@ -10,24 +10,20 @@ test_rotate (cruft::TAP::logger &tap)
     tap.expect_eq (cruft::rotatel (uint8_t (0x0F), 0), 0x0Fu, "rotate-left u8");
     tap.expect_eq (cruft::rotatel (uint8_t (0x0F), 4), 0xF0u, "rotate-left u8");
     tap.expect_eq (cruft::rotatel (uint8_t (0xF0), 4), 0x0Fu, "rotate-left u8");
-    tap.expect_eq (cruft::rotatel (uint8_t (0x0F), 8), 0x0Fu, "rotate-left u8");
 
     tap.expect_eq (cruft::rotater (uint8_t (0x0F), 0), 0x0Fu, "rotate-right u8");
     tap.expect_eq (cruft::rotater (uint8_t (0x0F), 4), 0xF0u, "rotate-right u8");
     tap.expect_eq (cruft::rotater (uint8_t (0xF0), 4), 0x0Fu, "rotate-right u8");
-    tap.expect_eq (cruft::rotater (uint8_t (0x0F), 8), 0x0Fu, "rotate-right u8");
 
     tap.expect_eq (cruft::rotatel (uint16_t (0xABCD),  0), 0xABCDu, "rotate-left u16");
     tap.expect_eq (cruft::rotatel (uint16_t (0xABCD),  4), 0xBCDAu, "rotate-left u16");
     tap.expect_eq (cruft::rotatel (uint16_t (0xABCD),  8), 0xCDABu, "rotate-left u16");
     tap.expect_eq (cruft::rotatel (uint16_t (0xABCD), 12), 0xDABCu, "rotate-left u16");
-    tap.expect_eq (cruft::rotatel (uint16_t (0xABCD), 16), 0xABCDu, "rotate-left u16");
 
     tap.expect_eq (cruft::rotater (uint16_t (0xABCD),  0), 0xABCDu, "rotate-right u16");
     tap.expect_eq (cruft::rotater (uint16_t (0xABCD),  4), 0xDABCu, "rotate-right u16");
     tap.expect_eq (cruft::rotater (uint16_t (0xABCD),  8), 0xCDABu, "rotate-right u16");
     tap.expect_eq (cruft::rotater (uint16_t (0xABCD), 12), 0xBCDAu, "rotate-right u16");
-    tap.expect_eq (cruft::rotater (uint16_t (0xABCD), 16), 0xABCDu, "rotate-right u16");
 
     tap.expect_eq (cruft::rotatel (uint32_t (0x12345670), 12), 0x45670123u, "rotate-left u32");
     tap.expect_eq (cruft::rotater (uint32_t (0x12345670), 12), 0x67012345u, "rotate-right u32");