Apply suggestions from code review

Author: simonrw

fitsio/tests/test_bit_datatype.rs

@@ -38,5 +38,6 @@ fn test_writing_bit_data_type() {
 
     let table_hdu = f.hdu("DATA").unwrap();
     let flags: Vec<u32> = dbg!(table_hdu.read_col(&mut f, "BITMASK").unwrap());
+    assert_eq!(flags.len(), 64);
     assert!(data.iter().zip(&flags).all(|(a, b)| a == b));
 }

fitsio/tests/test_vector_datatypes.rs

@@ -32,6 +32,7 @@ macro_rules! make_test {
 
             let table_hdu = f.hdu("DATA").unwrap();
             let data: Vec<$t> = table_hdu.read_col(&mut f, "TEST").unwrap();
+            assert_eq!(orig_data.len(), data.len());
             assert!(orig_data.iter().zip(&data).all(|(a, b)| a == b));
         }
     };