revert skipped tests

Author: Christopher Doris

test/Wrap.jl

@@ -367,13 +367,12 @@ end
     end
     @testset "pushfirst!" begin
         t = copy(z)
-        # TODO: Fix these
-        @test_skip pushfirst!(t, -1) === t
-        @test_skip t == [-1, 1, 2, 3]
-        @test_skip pushfirst!(t, -3, -2) === t
-        @test_skip t == [-3, -2, -1, 1, 2, 3]
-        @test_skip @test_throws Exception pushfirst!(t, 4.5)
-        @test_skip t == [-3, -2, -1, 1, 2, 3]
+        @test pushfirst!(t, -1) === t
+        @test t == [-1, 1, 2, 3]
+        @test pushfirst!(t, -3, -2) === t
+        @test t == [-3, -2, -1, 1, 2, 3]
+        @test @test_throws Exception pushfirst!(t, 4.5)
+        @test t == [-3, -2, -1, 1, 2, 3]
     end
     @testset "append!" begin
         t = copy(z)