Test Expr conversions

Author: HarrisonGrodin

test/variable_parsing.jl

@@ -4,6 +4,7 @@ using Test
 @Var a=1.0 b
 a1 = Variable(:a,1.0)
 @test a1 == a
+@test Expr(a) == :a
 
 @Var begin
     a = 1.0
@@ -20,6 +21,10 @@ z1 = DependentVariable(:z,dependents = [t])
 @test x1 == x
 @test y1 == y
 @test z1 == z
+@test Expr(x) == :x
+@test Expr(y) == :y
+@test Expr(z) == :z
+
 @IVar begin
     t
     s = cos(2.5)
@@ -28,11 +33,19 @@ t1 = IndependentVariable(:t)
 s1 = IndependentVariable(:s, cos(2.5))
 @test t1 == t
 @test s1 == s
+@test Expr(t) == :t
+@test Expr(s) == :s
+@test Expr(cos(t + sin(s))) == :(cos(t + sin(s)))
+
 @Deriv D''~t
 D1 = Differential(t, 2)
 @test D1 == D
+@test Expr(D) == D
+
 @Const c=0 v=2
 c1 = Constant(0)
 v1 = Constant(2)
 @test c1 == c
 @test v1 == v
+@test Expr(c) == 0
+@test Expr(v) == 2