Add a few tests for unicode symbols

Author: d-torrance

M2/Macaulay2/tests/normal/unicode.m2

@@ -0,0 +1,9 @@
+v = vector {1, 2}
+w = vector {3, 4}
+assert(v⊗w == vector {3, 4, 6, 8})
+
+Vector·Vector := (v, w) -> ((transpose v#0) * w#0)_(0, 0)
+assert(v·w == 11)
+
+-- should get "invalid symbol" error
+assert try getSymbol "⟎⟎" then false else true