Add benchmark for List.mapConserve

1 files changed, 15 insertions, 0 deletions

diff --git a/test/benchmarks/src/main/scala/scala/collection/immutable/ListBenchmark.scala b/test/benchmarks/src/main/scala/scala/collection/immutable/ListBenchmark.scala
index 5ed30de7f6..94844dcae2 100644
--- a/test/benchmarks/src/main/scala/scala/collection/immutable/ListBenchmark.scala
+++ b/test/benchmarks/src/main/scala/scala/collection/immutable/ListBenchmark.scala
@@ -54,4 +54,19 @@ class ListBenchmark {
   @Benchmark def filter_only_last: Any = {
     values.filter(v => v.value == last.value)
   }
+
+  @Setup(Level.Trial) def initKeys(): Unit = {
+    values = List.tabulate(size)(n => if (n == size / 2) "mid" else "")
+  }
+
+  @Benchmark def mapConserve_identity: Any = {
+    values.mapConserve(x => x)
+  }
+
+  @Benchmark def mapConserve_modifyAll: Any = {
+    values.mapConserve(x => "replace")
+  }
+  @Benchmark def mapConserve_modifyMid: Any = {
+    values.mapConserve(x => if (x == "mid") "replace" else x)
+  }
 }