Keep complete paths in missing version evidence

internal/engine/source_version_test.go

@@ -3,11 +3,40 @@ package engine
 import (
 	"errors"
 	"path/filepath"
+	"reflect"
 	"testing"
 
 	"gitea.maximumdirect.net/eric/ConfigKit/internal/document"
 )
 
+func TestSourceVersionAbsentPathKeepsUnresolvedSegmentIntent(t *testing.T) {
+	t.Parallel()
+	for _, test := range []struct {
+		name string
+		body string
+		path string
+		want []pathSegment
+	}{
+		{"missing member", "{}\n", "/meta/version", []pathSegment{{kind: pathSegmentKey, key: "meta"}, {kind: pathSegmentParsed, key: "version"}}},
+		{"scalar obstruction", "meta: false\n", "/meta/version", []pathSegment{{kind: pathSegmentKey, key: "meta"}, {kind: pathSegmentParsed, key: "version"}}},
+		{"unavailable index", "meta: []\n", "/meta/3/version", []pathSegment{{kind: pathSegmentKey, key: "meta"}, {kind: pathSegmentIndex, index: 3}, {kind: pathSegmentParsed, key: "version"}}},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			path, err := ParsePath(test.path)
+			if err != nil {
+				t.Fatal(err)
+			}
+			resolved := resolveSourceVersionPath(sourceVersionTestDocument(t, test.body), path)
+			if resolved.present || !reflect.DeepEqual(resolved.resolvedPath.segments, test.want) {
+				t.Fatalf("absent path = %#v, want %#v", resolved.resolvedPath, test.want)
+			}
+			if !reflect.DeepEqual(path.segments, mustParseSourceVersionPath(t, test.path).segments) {
+				t.Fatal("lookup mutated the requested path")
+			}
+		})
+	}
+}
+
 type sourceVersionMountedService struct {
 	Version string `yaml:"version"`
 }