test(scrubber): Add unit tests for Sentry.Scrubber

Cover redaction of default sensitive keys, credit card patterns,
recursion into nested maps, lists, and structs, and the public helper
functions.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: solnic

test/sentry/scrubber_test.exs

@@ -0,0 +1,53 @@
+defmodule Sentry.ScrubberTest do
+  use ExUnit.Case, async: true
+
+  alias Sentry.Scrubber
+
+  describe "scrub_map/1" do
+    test "redacts default sensitive keys" do
+      assert Scrubber.scrub_map(%{"password" => "hunter2", "username" => "alice"}) ==
+               %{"password" => "*********", "username" => "alice"}
+
+      assert Scrubber.scrub_map(%{"passwd" => "x", "secret" => "y", "ok" => "z"}) ==
+               %{"passwd" => "*********", "secret" => "*********", "ok" => "z"}
+    end
+
+    test "redacts credit card-like values" do
+      assert Scrubber.scrub_map(%{"card" => "4111111111111111"}) ==
+               %{"card" => "*********"}
+    end
+
+    test "leaves non-sensitive data untouched" do
+      data = %{"username" => "alice", "age" => 30, "active" => true}
+      assert Scrubber.scrub_map(data) == data
+    end
+
+    test "recurses into nested maps" do
+      assert Scrubber.scrub_map(%{"user" => %{"password" => "x", "name" => "alice"}}) ==
+               %{"user" => %{"password" => "*********", "name" => "alice"}}
+    end
+
+    test "recurses into lists of maps" do
+      assert Scrubber.scrub_map(%{"users" => [%{"password" => "x"}, %{"password" => "y"}]}) ==
+               %{"users" => [%{"password" => "*********"}, %{"password" => "*********"}]}
+    end
+
+    test "recurses into structs by converting them to maps" do
+      struct = %URI{scheme: "https", host: "example.com"}
+      result = Scrubber.scrub_map(%{"uri" => struct})
+      assert result["uri"].host == "example.com"
+    end
+  end
+
+  describe "default_scrubbed_param_keys/0" do
+    test "returns the default sensitive keys" do
+      assert Scrubber.default_scrubbed_param_keys() == ["password", "passwd", "secret"]
+    end
+  end
+
+  describe "scrubbed_value/0" do
+    test "returns the placeholder value used for redacted data" do
+      assert Scrubber.scrubbed_value() == "*********"
+    end
+  end
+end