diff --git a/dedupe_test.go b/dedupe_test.go
index 8bc2aa1d..c29b0851 100644
--- a/dedupe_test.go
+++ b/dedupe_test.go
@@ -60,13 +60,15 @@ func TestDedupe(t *testing.T) {
 			dedupeAdd := tessera.InMemoryDedupe(delegate, 256)
 
 			// Add foo, bar, baz to prime the cache to make things interesting
-			dedupeAdd(ctx, tessera.NewEntry([]byte("foo")))
-			dedupeAdd(ctx, tessera.NewEntry([]byte("bar")))
-			dedupeAdd(ctx, tessera.NewEntry([]byte("baz")))
+			for _, s := range []string{"foo", "bar", "baz"} {
+				if _, err := dedupeAdd(ctx, tessera.NewEntry([]byte(s)))(); err != nil {
+					t.Fatalf("dedupeAdd(%q): %v", s, err)
+				}
+			}
 
 			idx, err := dedupeAdd(ctx, tessera.NewEntry([]byte(tC.newValue)))()
 			if err != nil {
-				t.Fatal(err)
+				t.Fatalf("dedupeAdd(%q): %v", tC.newValue, err)
 			}
 			if idx != tC.wantIdx {
 				t.Errorf("got != want (%d != %d)", idx, tC.wantIdx)