add travis and tasks tests

.travis.yml

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+language: elixir
+
+elixir:
+  - 1.7.4
+  - 1.8.1
+
+otp_release:
+  - 20.3
+before_script:
+  - if elixir -v | grep -q 1.8; then mix format --check-formatted; fi # only enforce formatting for Elixir ~> 1.8
+
+script:
+  - mix coveralls.safe_travis
+  - mix credo --strict
+
+after_script:
+  - MIX_ENV=test mix inch.report

lib/mix/tasks/safe_travis.ex

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+if Mix.env() == :test do
+  defmodule Mix.Tasks.Coveralls.SafeTravis do
+    @moduledoc false
+    alias Mix.Tasks.Coveralls
+
+    use Mix.Task
+
+    @preferred_cli_env :test
+    @shortdoc "A safe `coveralls.travis` variant that doesn't crash on failed upload."
+
+    def run(args) do
+      Coveralls.Travis.run(args)
+    rescue
+      e in ExCoveralls.ReportUploadError ->
+        Mix.shell().error("Failed coveralls upload: #{Exception.message(e)}")
+    end
+  end
+end

test/mix/tasks_test.exs

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+defmodule Mix.Tasks.OpenStates.BuildTest do
+  use ExUnit.Case
+  import ExUnit.CaptureIO
+  import Mock
+  alias Mix.Tasks.{Coveralls, Coveralls.SafeTravis, Coveralls.Travis}
+  alias Mix.Tasks.{Credo, Docs, Format, Inch, OpenStates.Build}
+
+  describe "mix open_states.build" do
+    test "runs build task" do
+      with_mocks([
+        {Coveralls.Html, [], [run: fn _ -> nil end]},
+        {Credo, [], [run: fn _ -> nil end]},
+        {Docs, [], [run: fn _ -> nil end]},
+        {Inch, [], [run: fn _ -> nil end]}
+      ]) do
+        Build.run(["--no-format"])
+        assert_called(Coveralls.Html.run([]))
+        assert_called(Credo.run(["--strict"]))
+        assert_called(Docs.run([]))
+        assert_called(Inch.run([]))
+      end
+    end
+
+    test "runs the formatter when Elixir >= 1.8" do
+      if System.version() >= "1.8" do
+        with_mock(Format, run: fn _ -> nil end) do
+          assert capture_io(fn -> Build.run_formatter([]) end)
+                 |> String.contains?("Running formatter")
+
+          assert_called(Format.run(["--check-equivalent"]))
+        end
+      else
+        assert_raise RuntimeError, ~r/Elixir version must be >= 1.8/, fn ->
+          Build.run_formatter([])
+        end
+      end
+    end
+  end
+
+  describe "mix coveralls.safe_travis" do
+    test "runs" do
+      with_mock Travis, run: fn _ -> nil end do
+        SafeTravis.run(["hello"])
+        assert_called(Travis.run(["hello"]))
+      end
+    end
+
+    test "catches ExCoveralls.ReportUploadError" do
+      with_mock Travis, run: fn _ -> raise ExCoveralls.ReportUploadError end do
+        assert capture_io(:stderr, fn -> SafeTravis.run(["hello"]) end)
+      end
+    end
+  end
+end