Add tests for time validator

lib/code_corps/github/sync/comment/comment/changeset.ex

@@ -76,7 +76,7 @@ defmodule CodeCorps.GitHub.Sync.Comment.Comment.Changeset do
     |> Changeset.cast(CommentAdapter.to_comment(attrs), @update_attrs)
     |> MarkdownRendererService.render_markdown_to_html(:markdown, :body)
     |> Changeset.put_change(:modified_from, "github")
-    |> TimeValidator.validate_time_after(:modified_at)
+    |> TimeValidator.validate_time_not_before(:modified_at)
     |> Changeset.validate_required([:markdown, :body])
   end
 end

lib/code_corps/github/sync/issue/task/changeset.ex

@@ -89,7 +89,7 @@ defmodule CodeCorps.GitHub.Sync.Issue.Task.Changeset do
     |> Changeset.cast(IssueAdapter.to_task(issue_attrs), @update_attrs)
     |> MarkdownRendererService.render_markdown_to_html(:markdown, :body)
     |> Changeset.put_change(:modified_from, "github")
-    |> TimeValidator.validate_time_after(:modified_at)
+    |> TimeValidator.validate_time_not_before(:modified_at)
     |> Changeset.validate_required([:project_id, :title, :user_id])
     |> Changeset.assoc_constraint(:github_repo)
     |> Changeset.assoc_constraint(:project)

lib/code_corps/validators/time_validator.ex

@@ -6,24 +6,21 @@ defmodule CodeCorps.Validators.TimeValidator do
   alias Ecto.Changeset
 
   @doc """
-  Validates a time after a given time.
+  Validates the new time is not before the previous time.
   """
-  def validate_time_after(%{data: data} = changeset, field) do
+  def validate_time_not_before(%{data: data} = changeset, field) do
     previous_time = Map.get(data, field)
     current_time = Changeset.get_change(changeset, field)
     case current_time do
       nil -> changeset
-      _ -> do_validate_time_after(changeset, field, previous_time, current_time)
+      _ -> do_validate_time_not_before(changeset, field, previous_time, current_time)
     end
   end
 
-  defp do_validate_time_after(changeset, field, previous_time, current_time) do
-    is_after = current_time |> Timex.after?(previous_time)
-    is_equal = current_time |> Timex.equal?(previous_time)
-    after_or_equal = is_after || is_equal
-    case after_or_equal do
-      true -> changeset
-      false -> Changeset.add_error(changeset, field, "cannot be before the last recorded time")
+  defp do_validate_time_not_before(changeset, field, previous_time, current_time) do
+    case Timex.before?(current_time, previous_time) do
+      true -> Changeset.add_error(changeset, field, "cannot be before the last recorded time")
+      false -> changeset
     end
   end
 end

test/lib/code_corps/validators/time_validator_test.exs

@@ -5,20 +5,27 @@ defmodule CodeCorps.Validators.TimeValidatorTest do
 
   @previous_time DateTime.utc_now
 
-  describe "validate_time_after/2" do
+  describe "validate_time_not_before/2" do
     test "when the time happened before" do
       # set the time to 1 day before the previous (recorded) time
       current_time = @previous_time |> Timex.shift(days: -1)
       changeset = cast_times(@previous_time, current_time, :modified_at)
-      changeset = changeset |> validate_time_after(:modified_at)
+      changeset = changeset |> validate_time_not_before(:modified_at)
       refute changeset.valid?
     end
 
+    test "when the time happened at the same time" do
+      current_time = @previous_time
+      changeset = cast_times(@previous_time, current_time, :modified_at)
+      changeset = changeset |> validate_time_not_before(:modified_at)
+      assert changeset.valid?
+    end
+
     test "when the time happened after" do
       # set the time to 1 day after the previous (recorded) time
       current_time = @previous_time |> Timex.shift(days: 1)
       changeset = cast_times(@previous_time, current_time, :modified_at)
-      changeset = changeset |> validate_time_after(:modified_at)
+      changeset = changeset |> validate_time_not_before(:modified_at)
       assert changeset.valid?
     end
   end