fix(style): add missing @impl true to all handle_call clauses in Publishing GenServer (CSM-036)

test/bds/csm036_impl_true_test.exs

@@ -0,0 +1,45 @@
+defmodule BDS.CSM036ImplTrueTest do
+  use ExUnit.Case, async: true
+
+  @publishing_source File.read!("lib/bds/publishing.ex")
+
+  describe "CSM-036: @impl true on GenServer callbacks" do
+    test "every handle_call clause has @impl true" do
+      lines = String.split(@publishing_source, "\n")
+
+      handle_call_lines =
+        lines
+        |> Enum.with_index(1)
+        |> Enum.filter(fn {line, _idx} ->
+          String.contains?(line, "def handle_call(")
+        end)
+
+      assert length(handle_call_lines) >= 5, "expected at least 5 handle_call clauses"
+
+      for {_line, idx} <- handle_call_lines do
+        preceding = Enum.at(lines, idx - 2)
+
+        assert String.contains?(preceding, "@impl true"),
+               "handle_call at line #{idx} missing @impl true (preceding line: #{inspect(preceding)})"
+      end
+    end
+
+    test "no handle_cast, handle_info, or terminate without @impl true" do
+      lines = String.split(@publishing_source, "\n")
+
+      callback_lines =
+        lines
+        |> Enum.with_index(1)
+        |> Enum.filter(fn {line, _idx} ->
+          Regex.match?(~r/^\s+def (handle_cast|handle_info|terminate)\(/, line)
+        end)
+
+      for {_line, idx} <- callback_lines do
+        preceding = Enum.at(lines, idx - 2)
+
+        assert String.contains?(preceding, "@impl true"),
+               "callback at line #{idx} missing @impl true"
+      end
+    end
+  end
+end