Symbolic indexing interface tests

Author: AayushSabharwal

test/symbolic_indexing_interface_test.jl

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+using RecursiveArrayTools, Test
+
+sc = SymbolCache(nothing, nothing, nothing)
+@test isempty(independent_variables(sc))
+@test !is_indep_sym(sc, :a)
+@test isempty(states(sc))
+@test isnothing(state_sym_to_index(sc, :a))
+@test !is_state_sym(sc, :a)
+@test isempty(parameters(sc))
+@test isnothing(param_sym_to_index(sc, :a))
+@test !is_param_sym(sc, :a)
+
+sc = SymbolCache([:a, :b], [:t], [:c, :d])
+@test independent_variables(sc) == [:t]
+@test is_indep_sym(sc, :t)
+@test !is_indep_sym(sc, :a)
+@test states(sc) == [:a, :b]
+@test state_sym_to_index(sc, :a) == 1
+@test state_sym_to_index(sc, :b) == 2
+@test isnothing(state_sym_to_index(sc, :t))
+@test all(is_state_sym.((sc,), [:a, :b]))
+@test !is_state_sym(sc, :c)
+@test parameters(sc) == [:c, :d]
+@test param_sym_to_index(sc, :c) == 1
+@test param_sym_to_index(sc, :d) == 2
+@test isnothing(param_sym_to_index(sc, :a))
+@test all(is_param_sym.((sc,), [:c, :d]))
+@test !is_param_sym(sc, :b)