unit tests

Author: a

test/runtests.jl

@@ -7,6 +7,7 @@ using Test
     @test children(ex) == [:f, :a, :b]
     @test operation(ex) == :f
     @test arguments(ex) == [:a, :b]
+    @test isexpr(ex)
     @test iscall(ex)
     @test ex == maketerm(Expr, :call, [:f, :a, :b])
 
@@ -15,6 +16,7 @@ using Test
     @test head(ex) == :ref
     @test_throws ErrorException operation(ex)
     @test_throws ErrorException arguments(ex)
+    @test isexpr(ex)
     @test !iscall(ex)
     @test ex == maketerm(Expr, :ref, [:arr, :i, :j])
 end