feat: alignment on media import event shape

test/bds/alignment_test.exs

@@ -0,0 +1,31 @@
+defmodule BDS.AlignmentTest do
+  use ExUnit.Case, async: true
+
+  @media_import_specs [
+    "specs/media.allium",
+    "specs/media_processing.allium"
+  ]
+
+  test "media import specs use one source-path-first event shape" do
+    signatures =
+      @media_import_specs
+      |> Enum.flat_map(fn path ->
+        path
+        |> File.read!()
+        |> import_media_signatures(path)
+      end)
+
+    assert signatures == [
+             {"specs/media.allium", "source_path, project, metadata"},
+             {"specs/media.allium", "source_path, project, metadata"},
+             {"specs/media_processing.allium", "source_path, project, metadata"},
+             {"specs/media_processing.allium", "source_path, project, metadata"}
+           ]
+  end
+
+  defp import_media_signatures(source, path) do
+    ~r/ImportMediaRequested\(([^)]+)\)/
+    |> Regex.scan(source, capture: :all_but_first)
+    |> Enum.map(fn [signature] -> {path, signature} end)
+  end
+end