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diff --git a/test/ir/ir.py b/test/ir/ir.py
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+++ b/test/ir/ir.py
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+from miasm2.expression.expression import *
+from miasm2.ir.ir import AssignBlock
+from miasm2.expression.simplifications import expr_simp
+
+id_a = ExprId("a")
+id_b = ExprId("b")
+int0 = ExprInt(0, id_a.size)
+
+# Test AssignBlock
+## Constructors
+assignblk1 = AssignBlock([ExprAff(id_a, id_b)])
+assignblk2 = AssignBlock({id_a: id_b})
+
+## Equality
+assignblk1_bis = AssignBlock([ExprAff(id_a, id_b)])
+assert assignblk1 == assignblk1_bis
+assert assignblk1 == assignblk2
+
+## Immutability
+try:
+    assignblk1[id_a] = id_a
+except RuntimeError:
+    pass
+else:
+    raise RuntimeError("An error was expected")
+try:
+    del assignblk1[id_a]
+except RuntimeError:
+    pass
+else:
+    raise RuntimeError("An error was expected")
+
+## Basic APIs
+assert assignblk1.get_r() == set([id_b])
+assert assignblk1.get_w() == set([id_a])
+assert assignblk1.get_rw() == {id_a: set([id_b])}
+assert assignblk1.keys() == [id_a]
+assert dict(assignblk1) == {id_a: id_b}
+assert assignblk1[id_a] == id_b
+
+## Simplify
+assignblk3 = AssignBlock({id_a: id_b - id_b})
+assert assignblk3[id_a] != int0
+assignblk4 = assignblk3.simplify(expr_simp)
+assert assignblk3[id_a] != int0
+assert assignblk4[id_a] == int0