add --warnings-as-errors behaviour for tests

Adriano Mitre · Adriano Mitre · commit 73ef4ce0f0b9 · 2020-11-03T19:30:20.000-03:00
elixir-toniq/norm#100 (comment)
diff --git a/test/test_helper.exs b/test/test_helper.exs
@@ -1 +1,4 @@
+if System.get_env("CI") do
+  Code.compiler_options(warnings_as_errors: true)
+end
 ExUnit.start()
