diff --git a/cranelift/src/libcretonne/cfg.rs b/cranelift/src/libcretonne/cfg.rs
index 8c423c23ac..668f5b51ef 100644
--- a/cranelift/src/libcretonne/cfg.rs
+++ b/cranelift/src/libcretonne/cfg.rs
@@ -94,37 +94,10 @@ impl ControlFlowGraph {
 
 #[cfg(test)]
 mod tests {
-    use instructions::*;
-    use entity_map::EntityRef;
-    use entities::{Ebb, Inst, NO_VALUE};
-    use repr::Function;
     use super::*;
-    use types;
+    use repr::Function;
 
-    // Some instructions will be re-used in several tests.
-
-    fn jump(func: &mut Function, dest: Ebb) -> Inst {
-        func.make_inst(InstructionData::Jump {
-            opcode: Opcode::Jump,
-            ty: types::VOID,
-            data: Box::new(JumpData {
-                destination: dest,
-                arguments: VariableArgs::new(),
-            }),
-        })
-    }
-
-    fn branch(func: &mut Function, dest: Ebb) -> Inst {
-        func.make_inst(InstructionData::Branch {
-            opcode: Opcode::Brz,
-            ty: types::VOID,
-            data: Box::new(BranchData {
-                arg: NO_VALUE,
-                destination: dest,
-                arguments: VariableArgs::new(),
-            }),
-        })
-    }
+    use test_utils::make_inst;
 
     #[test]
     fn empty() {
@@ -145,7 +118,7 @@ mod tests {
 
         let mut fun_ebbs = func.ebbs_numerically();
         for (ebb, predecessors) in nodes {
-            assert_eq!(ebb.index(), fun_ebbs.next().unwrap().index());
+            assert_eq!(*ebb, fun_ebbs.next().unwrap());
             assert_eq!(predecessors.len(), 0);
         }
     }
@@ -157,16 +130,16 @@ mod tests {
         let ebb1 = func.make_ebb();
         let ebb2 = func.make_ebb();
 
-        let br_ebb0_ebb2 = branch(&mut func, ebb2);
+        let br_ebb0_ebb2 = make_inst::branch(&mut func, ebb2);
         func.append_inst(ebb0, br_ebb0_ebb2);
 
-        let jmp_ebb0_ebb1 = jump(&mut func, ebb1);
+        let jmp_ebb0_ebb1 = make_inst::jump(&mut func, ebb1);
         func.append_inst(ebb0, jmp_ebb0_ebb1);
 
-        let br_ebb1_ebb1 = branch(&mut func, ebb1);
+        let br_ebb1_ebb1 = make_inst::branch(&mut func, ebb1);
         func.append_inst(ebb1, br_ebb1_ebb1);
 
-        let jmp_ebb1_ebb2 = jump(&mut func, ebb2);
+        let jmp_ebb1_ebb2 = make_inst::jump(&mut func, ebb2);
         func.append_inst(ebb1, jmp_ebb1_ebb2);
 
         let cfg = ControlFlowGraph::new(&func);
diff --git a/cranelift/src/libcretonne/lib.rs b/cranelift/src/libcretonne/lib.rs
index 100d3121e2..d5c501477c 100644
--- a/cranelift/src/libcretonne/lib.rs
+++ b/cranelift/src/libcretonne/lib.rs
@@ -18,3 +18,5 @@ pub mod write;
 pub mod cfg;
 
 pub mod entity_map;
+
+#[cfg(test)] pub mod test_utils;
diff --git a/cranelift/src/libcretonne/test_utils/make_inst.rs b/cranelift/src/libcretonne/test_utils/make_inst.rs
new file mode 100644
index 0000000000..167512b8b5
--- /dev/null
+++ b/cranelift/src/libcretonne/test_utils/make_inst.rs
@@ -0,0 +1,35 @@
+///! Helper functions for generating dummy instructions.
+
+use repr::Function;
+use entities::{Ebb, Inst, NO_VALUE};
+use instructions::{
+    InstructionData,
+    Opcode,
+    VariableArgs,
+    JumpData,
+    BranchData,
+};
+use types;
+
+pub fn jump(func: &mut Function, dest: Ebb) -> Inst {
+    func.make_inst(InstructionData::Jump {
+        opcode: Opcode::Jump,
+        ty: types::VOID,
+        data: Box::new(JumpData {
+            destination: dest,
+            arguments: VariableArgs::new(),
+        }),
+    })
+}
+
+pub fn branch(func: &mut Function, dest: Ebb) -> Inst {
+    func.make_inst(InstructionData::Branch {
+        opcode: Opcode::Brz,
+        ty: types::VOID,
+        data: Box::new(BranchData {
+            arg: NO_VALUE,
+            destination: dest,
+            arguments: VariableArgs::new(),
+        }),
+    })
+}
diff --git a/cranelift/src/libcretonne/test_utils/mod.rs b/cranelift/src/libcretonne/test_utils/mod.rs
new file mode 100644
index 0000000000..49e6b23be8
--- /dev/null
+++ b/cranelift/src/libcretonne/test_utils/mod.rs
@@ -0,0 +1,3 @@
+///! Test utility functions.
+
+pub mod make_inst;