Test action

.github/workflows/reviewdog.yml

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+name: reviewdog
+on: [pull_request]
+jobs:
+  elvis:
+    name: runner / elvis
+    runs-on: ubuntu-latest
+    container:
+      image: elixir:1.9.1-slim
+    steps:
+      - name: Check out code.
+        uses: actions/checkout@v1
+      - name: elvis
+        uses: hauleth/reviewdog-action-elvis@master
+        with:
+          github_token: ${{ secrets.github_token }}
+      - name: elvis-pr-review
+        uses: hauleth/reviewdog-action-elvis@master
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-review

.gitignore

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+_build

elvis.config

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+[
+ {
+  elvis,
+  [
+   {config,
+    [#{dirs => ["test"],
+       filter => "*.erl",
+       ruleset => erl_files
+      }]
+   },
+   {output_format, plain}
+  ]
+ }
+].

test/example.erl

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+-module(example).
+
+fun(_foo) -> ok.