🐐 Compound assignment

tests.py

@@ -265,6 +265,31 @@ assignment_tests = [
                  Designa(ID("x"), BinOp(ID("x"), Numeral("I"), "SYMBOL_PLUS")),
                  ExpressionStatement(ID("x"))]),
     ValInt(3)),
+  # Compound assignment — AVGE (+=)
+  ("DESIGNA x VT V\nx AVGE III\nx",
+    Program([], [Designa(ID("x"), Numeral("V")),
+                 Designa(ID("x"), BinOp(ID("x"), Numeral("III"), "SYMBOL_PLUS")),
+                 ExpressionStatement(ID("x"))]),
+    ValInt(8)),
+  # Compound assignment — MINVE (-=)
+  ("DESIGNA x VT X\nx MINVE III\nx",
+    Program([], [Designa(ID("x"), Numeral("X")),
+                 Designa(ID("x"), BinOp(ID("x"), Numeral("III"), "SYMBOL_MINUS")),
+                 ExpressionStatement(ID("x"))]),
+    ValInt(7)),
+  # AVGE with complex expression
+  ("DESIGNA x VT I\nx AVGE II + III\nx",
+    Program([], [Designa(ID("x"), Numeral("I")),
+                 Designa(ID("x"), BinOp(ID("x"), BinOp(Numeral("II"), Numeral("III"), "SYMBOL_PLUS"), "SYMBOL_PLUS")),
+                 ExpressionStatement(ID("x"))]),
+    ValInt(6)),
+  # AVGE inside a loop (DONICVM range is exclusive of upper bound: I VSQVE III = [1, 2])
+  ("DESIGNA s VT NVLLVS\nDONICVM i VT I VSQVE III FACE {\ns AVGE i\n}\ns",
+    Program([], [Designa(ID("s"), Nullus()),
+                 PerStatement(DataRangeArray(Numeral("I"), Numeral("III")), ID("i"),
+                   [Designa(ID("s"), BinOp(ID("s"), ID("i"), "SYMBOL_PLUS"))]),
+                 ExpressionStatement(ID("s"))]),
+    ValInt(3)),
 ]
 
 class TestAssignment(unittest.TestCase):