1 files changed, 34 insertions, 0 deletions
diff --git a/internal/engine/match_test.go b/internal/engine/match_test.go
index 63bb54a..224f881 100644
--- a/internal/engine/match_test.go
+++ b/internal/engine/match_test.go
@@ -460,3 +460,37 @@ func TestRuleDuplicateWarningShortensThePath(t *testing.T) {
 		t.Errorf("no shortened rule warning for a.txt: %+v %+v", r.Matched, r.Unmatched)
 	}
 }
+
+// TestFileMatchNamesTheDuplicate: a file a (duplicate) test matched comes
+// back with the other copy's absolute path, so a front end can say where it
+// is and act on it - the reason text alone says "duplicate of NAME" for a
+// copy inside the directory, which reads as no place at all (plan 21).
+func TestFileMatchNamesTheDuplicate(t *testing.T) {
+	e, d, _ := fixture(t)
+	res, err := e.Match(context.Background(), d)
+	if err != nil {
+		t.Fatal(err)
+	}
+	found := false
+	for _, fm := range res.Matched {
+		if fm.File.Rel != "report (1).pdf" && fm.File.Rel != "report.pdf" {
+			continue
+		}
+		if fm.DuplicateOf == "" {
+			continue
+		}
+		found = true
+		if !filepath.IsAbs(fm.DuplicateOf) {
+			t.Errorf("%s: DuplicateOf = %q, want an absolute path", fm.File.Rel, fm.DuplicateOf)
+		}
+		if fm.DuplicateOf == fm.File.Path {
+			t.Errorf("%s: reported as a duplicate of itself", fm.File.Rel)
+		}
+		if _, err := os.Stat(fm.DuplicateOf); err != nil {
+			t.Errorf("%s: DuplicateOf does not exist: %v", fm.File.Rel, err)
+		}
+	}
+	if !found {
+		t.Fatal("neither copy came back with the file it duplicates")
+	}
+}