From d09dd1f6975771946f76a5556050cfc6eddd3eda Mon Sep 17 00:00:00 2001
From: Hubert Plociniczak <hubert.plociniczak@gmail.com>
Date: Fri, 16 Dec 2022 16:35:49 +0100
Subject: [PATCH] Allow for dry-running benchmark test (#3989)

When integrated with CI, will guard against any compilation failures. Can be enabled via env var `ENSO_BENCHMARK_TEST_DRY_RUN="True"`:
```
ENSO_BENCHMARK_TEST_DRY_RUN="True" built-distribution/enso-engine-0.0.0-dev-linux-amd64/enso-0.0.0-dev/bin/enso --run test/Benchmarks
```

# Important Notes
/cc @mwu-tow this could be run only on linux PRs in CI
---
 .../Standard/Test/0.0.0-dev/src/Bench.enso    | 20 ++++++++++++-------
 .../src/Statistics/Count_Min_Max.enso         |  1 +
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/distribution/lib/Standard/Test/0.0.0-dev/src/Bench.enso b/distribution/lib/Standard/Test/0.0.0-dev/src/Bench.enso
index 5f5794fbd7b..ba8da26143f 100644
--- a/distribution/lib/Standard/Test/0.0.0-dev/src/Bench.enso
+++ b/distribution/lib/Standard/Test/0.0.0-dev/src/Bench.enso
@@ -20,23 +20,29 @@ type Bench
              example_measure =
                  Bench.measure Examples.get_boolean "foo" iter_size=2 num_iters=1
     measure : Any -> Text -> Integer -> Integer -> Nothing
-    measure = ~act -> label -> iter_size -> num_iters ->
+    measure = ~act -> label -> iter_size -> num_iters  ->
+        dry_run = Environment.get_or_else "ENSO_BENCHMARK_TEST_DRY_RUN" "False" == "True"
         result = Ref.new 0.0
         single_call = _ ->
             x1 = System.nano_time
             Runtime.no_inline act
             x2 = System.nano_time
             x2 - x1
-        iteration = it_num ->
+        iteration = it_size -> it_num ->
             act_it_num = num_iters - it_num
-            res = times iter_size single_call
+            res = times it_size single_call
             avg = avg_list res
             fmt = (avg / 1000000).format "%.2f"
             result.put (result.get + avg)
-            IO.println (label + "/iteration:" + act_it_num.to_text + ": " + fmt + "ms")
-        times num_iters iteration
-        fmt_avg = (result.get / (1000000*num_iters)).format "%.2f"
-        IO.println (label + " average: " + fmt_avg + "ms")
+            case dry_run of
+                False ->
+                    IO.println (label + "/iteration:" + act_it_num.to_text + ": " + fmt + "ms")
+                True ->
+                    IO.println (label + "/dry-run: " + fmt)
+        if dry_run then times 1 (iteration 1) else
+            times num_iters (iteration iter_size)
+            fmt_avg = (result.get / (1000000*num_iters)).format "%.2f"
+            IO.println (label + " average: " + fmt_avg + "ms")
 
 ## PRIVATE
 
diff --git a/test/Benchmarks/src/Statistics/Count_Min_Max.enso b/test/Benchmarks/src/Statistics/Count_Min_Max.enso
index d43d1eaa2f8..3a6d59cebda 100644
--- a/test/Benchmarks/src/Statistics/Count_Min_Max.enso
+++ b/test/Benchmarks/src/Statistics/Count_Min_Max.enso
@@ -1,5 +1,6 @@
 from Standard.Base import IO, Integer, Vector
 from Standard.Base.Data.Statistics import all
+import Standard.Base.Data.Range
 
 from Standard.Test import Bench, Faker