Keep import selection evidence with its declaring source

internal/engine/import_evidence_test.go

@@ -2,11 +2,54 @@ package engine
 
 import (
 	"errors"
+	"fmt"
 	"path/filepath"
 	"reflect"
 	"testing"
 )
 
+func TestBroadEmptyImportSelectionsKeepDeclaringSourceOwnership(t *testing.T) {
+	t.Parallel()
+
+	directory := t.TempDir()
+	mainPath := writeImportFile(t, directory, "main.yml", `configkit:
+  imports:
+    - glob: fragments/*.yml
+    - path: []
+`)
+	const fragments = 32
+	for index := 0; index < fragments; index++ {
+		writeImportFile(t, directory, fmt.Sprintf("fragments/fragment-%02d.yml", index), `configkit:
+  imports:
+    - path: missing.yml
+    - path: []
+`)
+	}
+	loaded, err := testLoad[map[string]any](File(mainPath), Options[map[string]any]{Imports: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	sources := loaded.Sources()
+	if len(sources) != fragments+1 {
+		t.Fatalf("source count = %d, want %d", len(sources), fragments+1)
+	}
+	for index, source := range sources {
+		wantPaths := []string{"/configkit/imports/0", "/configkit/imports/1"}
+		if index == 0 {
+			wantPaths = wantPaths[1:]
+		}
+		if len(source.importSelections) != len(wantPaths) {
+			t.Fatalf("source %s selections = %#v", source.ID, source.importSelections)
+		}
+		for selectionIndex, selection := range source.importSelections {
+			if selection.path.String() != wantPaths[selectionIndex] || selection.location.SourceID != source.ID ||
+				selection.selector != importSelectorPath || selection.outcome != importSelectionNone {
+				t.Errorf("source %s selection %d = %#v", source.ID, selectionIndex, selection)
+			}
+		}
+	}
+}
+
 func TestOptionalEmptyImportSelectionsRemainSourceLocalAndDetached(t *testing.T) {
 	t.Parallel()