test DRY refactor

test/commands/add_execute_test.exs

@@ -83,40 +83,42 @@ defmodule AddExecuteTest do
     end
   end
 
-  test ":package_already_exists when poison already exists" do
-    Helpers.IO.stub_stderr()
-    %WandFile{
-      dependencies: [
-        %Dependency{name: "poison", requirement: "~> 3.1"},
-      ]
-    }
-    |> Helpers.WandFile.stub_load()
-    Helpers.Hex.stub_poison()
-    assert Add.execute([@poison]) == error(:package_already_exists)
-  end
+  describe "dependency errors" do
+    setup do
+      Helpers.IO.stub_stderr()
+      Helpers.Hex.stub_poison()
+      :ok
+    end
 
-  test ":package_already_exists when trying to add the same package twice" do
-    Helpers.IO.stub_stderr()
-    Helpers.WandFile.stub_load()
-    Helpers.Hex.stub_poison()
-    Helpers.Hex.stub_poison()
-      assert Add.execute([@poison, @poison]) == error(:package_already_exists)
-  end
+    test ":package_already_exists when poison already exists" do
+      %WandFile{
+        dependencies: [
+          %Dependency{name: "poison", requirement: "~> 3.1"},
+        ]
+      }
+      |> Helpers.WandFile.stub_load()
+      assert Add.execute([@poison]) == error(:package_already_exists)
+    end
 
-  test ":file_write_error when trying to save the file" do
-    Helpers.IO.stub_stderr()
-    Helpers.Hex.stub_poison()
-    Helpers.WandFile.stub_load()
-    %WandFile{
-      dependencies: [%Dependency{name: "poison", requirement: "~> 3.1.0"}]
-    }
-    |> Helpers.WandFile.stub_cannot_save()
-    assert Add.execute([@poison]) == error(:file_write_error)
+    test ":package_already_exists when trying to add the same package twice" do
+      Helpers.WandFile.stub_load()
+      Helpers.Hex.stub_poison()
+        assert Add.execute([@poison, @poison]) == error(:package_already_exists)
+    end
+
+    test ":file_write_error when trying to save the file" do
+      Helpers.WandFile.stub_load()
+      %WandFile{
+        dependencies: [%Dependency{name: "poison", requirement: "~> 3.1.0"}]
+      }
+      |> Helpers.WandFile.stub_cannot_save()
+      assert Add.execute([@poison]) == error(:file_write_error)
+    end
   end
 
   test "adds a single package" do
-    Helpers.Hex.stub_poison()
     Helpers.WandFile.stub_load()
+    Helpers.Hex.stub_poison()
     %WandFile{
       dependencies: [%Dependency{name: "poison", requirement: "~> 3.1.0"}]
     }