ensure symbolic functions work on Chain, MultiVector and Simplex objects

src/Grassmann.jl

@@ -255,7 +255,7 @@ function __init__()
     end
     @require SymPy="24249f21-da20-56a4-8eb1-6a02cf4ae2e6" begin
         generate_algebra(:SymPy,:Sym,:diff,:symbols)
-        T = Union{TensorTerm, TensorMixed}
+        T = Union{TensorGraded, TensorMixed}
         symbolic = v -> typeof(v) == SymPy.Sym
         SymPy.expand(x::T) = map(v -> symbolic(v) ? SymPy.expand(v) : v, x)
         SymPy.factor(x::T) = map(v -> symbolic(v) ? SymPy.factor(v) : v, x)
@@ -269,7 +269,7 @@ function __init__()
     end
     @require SymEngine="123dc426-2d89-5057-bbad-38513e3affd8" begin
         generate_algebra(:SymEngine,:Basic,:diff,:symbols)
-        T = Union{TensorTerm, TensorMixed}
+        T = Union{TensorGraded, TensorMixed}
         symbolic = v -> typeof(v) == SymEngine.Basic
         SymEngine.expand(x::T) = map(v -> symbolic(v) ? SymEngine.expand(v) : v, x)
         SymEngine.subs(x::T, args...) = map(v -> symbolic(v) ? SymEngine.subs(v, args...) : v, x)

test/symbolictests.jl

@@ -1,6 +1,6 @@
 
 """
-Test symbolic expressions.
+Smoke tests for common SymPy and SymEngine functions.
 """
 module SymbolicTests
 using Grassmann
@@ -11,12 +11,17 @@ using Grassmann
         @basis S"+++"
         x,y,z = SymEngine.symbols("x y z")
 
+        # expanding the symbolic coefficient of a `Simplex`
         simp = (x+1)^2*v1
         @show SymEngine.expand(simp)
 
+        # expansion/substitution on each symbolic coefficient of a `MultiVector`
         mv = (x+y)^3 * v12 + (y+z) * v123
         @show SymEngine.subs(mv, Dict(x=>2, y=>2, z=>2))
         @show SymEngine.expand(mv)
+
+        # expanding each symbolic coefficient of a `Chain`
+        @show expand((x+1)*(x+2)*(v1+v2))
     end
 
     @testset "Test SymPy" begin