diff --git a/sa-builder/src/lib.rs b/sa-builder/src/lib.rs
index 47a4aef..5cc8140 100644
--- a/sa-builder/src/lib.rs
+++ b/sa-builder/src/lib.rs
@@ -175,42 +175,42 @@ mod tests {
     #[test]
     fn test_build_ssa_libsais() {
         let mut text = b"ABRACADABRA$".to_vec();
-        let sa = build_ssa(&mut text, &SAConstructionAlgorithm::LibSais, 1).unwrap();
+        let sa = build_ssa(text, &SAConstructionAlgorithm::LibSais, 1).unwrap();
         assert_eq!(sa, vec![11, 10, 7, 0, 3, 5, 8, 1, 4, 6, 9, 2]);
     }
 
     #[test]
     fn test_build_ssa_libsais_empty() {
         let mut text = b"".to_vec();
-        let sa = build_ssa(&mut text, &SAConstructionAlgorithm::LibSais, 1).unwrap();
+        let sa = build_ssa(text, &SAConstructionAlgorithm::LibSais, 1).unwrap();
         assert_eq!(sa, vec![]);
     }
 
     #[test]
     fn test_build_ssa_libsais_sparse() {
         let mut text = b"ABRACADABRA$".to_vec();
-        let sa = build_ssa(&mut text, &SAConstructionAlgorithm::LibSais, 2).unwrap();
+        let sa = build_ssa(text, &SAConstructionAlgorithm::LibSais, 2).unwrap();
         assert_eq!(sa, vec![10, 0, 8, 4, 6, 2]);
     }
 
     #[test]
     fn test_build_ssa_libdivsufsort() {
         let mut text = b"ABRACADABRA$".to_vec();
-        let sa = build_ssa(&mut text, &SAConstructionAlgorithm::LibDivSufSort, 1).unwrap();
+        let sa = build_ssa(text, &SAConstructionAlgorithm::LibDivSufSort, 1).unwrap();
         assert_eq!(sa, vec![11, 10, 7, 0, 3, 5, 8, 1, 4, 6, 9, 2]);
     }
 
     #[test]
     fn test_build_ssa_libdivsufsort_empty() {
         let mut text = b"".to_vec();
-        let sa = build_ssa(&mut text, &SAConstructionAlgorithm::LibDivSufSort, 1).unwrap();
+        let sa = build_ssa(text, &SAConstructionAlgorithm::LibDivSufSort, 1).unwrap();
         assert_eq!(sa, vec![]);
     }
 
     #[test]
     fn test_build_ssa_libdivsufsort_sparse() {
         let mut text = b"ABRACADABRA$".to_vec();
-        let sa = build_ssa(&mut text, &SAConstructionAlgorithm::LibDivSufSort, 2).unwrap();
+        let sa = build_ssa(text, &SAConstructionAlgorithm::LibDivSufSort, 2).unwrap();
         assert_eq!(sa, vec![10, 0, 8, 4, 6, 2]);
     }