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alg/ensemble: test results unchanged #101

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May 13, 2021
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alg/ensemble: test results unchanged #101

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2676db6
alg/ensemble: test results unchanged
mmcloughlin May 13, 2021
202e30f
mark test parallel at top level
mmcloughlin May 13, 2021
1d4f7a4
test.RequireLong
mmcloughlin May 13, 2021
5561ee2
comment
mmcloughlin May 13, 2021
5f837b6
restore t.Parallel()
mmcloughlin May 13, 2021
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69 changes: 69 additions & 0 deletions alg/ensemble/ensemble_test.go
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,11 +1,80 @@
package ensemble

import (
"encoding/json"
"io/ioutil"
"reflect"
"testing"

"github.com/mmcloughlin/addchain/alg/exec"
"github.com/mmcloughlin/addchain/internal/results"
"github.com/mmcloughlin/addchain/internal/test"
)

// TestResults confirms that chain lengths from every ensemble algorithm remain
// unchanged. This is intended to provide confidence when making risky changes
// or refactors. The results package has its own similar test, but this is
// focussed on verifying that the best recorded result is still the same.
//
// The test uses the "golden test" technique, where we dump
// known-good results into golden files and later verify that we get the same
// result.
func TestResults(t *testing.T) {
t.Parallel()
test.RequireLong(t)

as := Ensemble()
for _, c := range results.Results {
c := c // scopelint
t.Run(c.Slug, func(t *testing.T) {
t.Parallel()

// Execute.
ex := exec.NewParallel()
rs := ex.Execute(c.Target(), as)

// Summarize results in map from algorithm name to program length.
got := map[string]int{}
for _, r := range rs {
if r.Err != nil {
t.Fatalf("error with %s: %v", r.Algorithm, r.Err)
}
got[r.Algorithm.String()] = len(r.Program)
}

// If golden, write out results data file.
filename := test.GoldenName(c.Slug)

if test.Golden() {
t.Logf("writing golden file %s", filename)
b, err := json.MarshalIndent(got, "", "\t")
if err != nil {
t.Fatal(err)
}
if err := ioutil.WriteFile(filename, b, 0644); err != nil {
t.Fatalf("write golden file: %v", err)
}
}

// Load golden file.
b, err := ioutil.ReadFile(filename)
if err != nil {
t.Fatalf("read golden file: %v", err)
}

var expect map[string]int
if err := json.Unmarshal(b, &expect); err != nil {
t.Fatal(err)
}

// Verify equal.
if !reflect.DeepEqual(expect, got) {
t.Fatal("results do not match golden file")
}
})
}
}

func BenchmarkResults(b *testing.B) {
as := Ensemble()
for _, c := range results.Results {
Expand Down
202 changes: 202 additions & 0 deletions alg/ensemble/testdata/curve25519_field.golden
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,202 @@
{
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"opt(dictionary(hybrid(2,0),continued_fractions(co_binary)))": 381,
"opt(dictionary(hybrid(2,0),continued_fractions(dichotomic)))": 268,
"opt(dictionary(hybrid(2,0),heuristic(use_first(halving,approximation))))": 381,
"opt(dictionary(hybrid(2,0),heuristic(use_first(halving,delta_largest))))": 502,
"opt(dictionary(hybrid(2,16),continued_fractions(binary)))": 276,
"opt(dictionary(hybrid(2,16),continued_fractions(co_binary)))": 276,
"opt(dictionary(hybrid(2,16),continued_fractions(dichotomic)))": 276,
"opt(dictionary(hybrid(2,16),heuristic(use_first(halving,approximation))))": 276,
"opt(dictionary(hybrid(2,16),heuristic(use_first(halving,delta_largest))))": 276,
"opt(dictionary(hybrid(2,32),continued_fractions(binary)))": 271,
"opt(dictionary(hybrid(2,32),continued_fractions(co_binary)))": 271,
"opt(dictionary(hybrid(2,32),continued_fractions(dichotomic)))": 270,
"opt(dictionary(hybrid(2,32),heuristic(use_first(halving,approximation))))": 271,
"opt(dictionary(hybrid(2,32),heuristic(use_first(halving,delta_largest))))": 281,
"opt(dictionary(hybrid(2,64),continued_fractions(binary)))": 272,
"opt(dictionary(hybrid(2,64),continued_fractions(co_binary)))": 272,
"opt(dictionary(hybrid(2,64),continued_fractions(dichotomic)))": 268,
"opt(dictionary(hybrid(2,64),heuristic(use_first(halving,approximation))))": 272,
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"opt(dictionary(hybrid(3,0),continued_fractions(dichotomic)))": 268,
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"opt(dictionary(hybrid(3,0),heuristic(use_first(halving,delta_largest))))": 503,
"opt(dictionary(hybrid(3,16),continued_fractions(binary)))": 276,
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"opt(dictionary(hybrid(5,32),continued_fractions(co_binary)))": 271,
"opt(dictionary(hybrid(5,32),continued_fractions(dichotomic)))": 270,
"opt(dictionary(hybrid(5,32),heuristic(use_first(halving,approximation))))": 271,
"opt(dictionary(hybrid(5,32),heuristic(use_first(halving,delta_largest))))": 282,
"opt(dictionary(hybrid(5,64),continued_fractions(binary)))": 272,
"opt(dictionary(hybrid(5,64),continued_fractions(co_binary)))": 272,
"opt(dictionary(hybrid(5,64),continued_fractions(dichotomic)))": 268,
"opt(dictionary(hybrid(5,64),heuristic(use_first(halving,approximation))))": 272,
"opt(dictionary(hybrid(5,64),heuristic(use_first(halving,delta_largest))))": 310,
"opt(dictionary(hybrid(6,0),continued_fractions(binary)))": 381,
"opt(dictionary(hybrid(6,0),continued_fractions(co_binary)))": 381,
"opt(dictionary(hybrid(6,0),continued_fractions(dichotomic)))": 277,
"opt(dictionary(hybrid(6,0),heuristic(use_first(halving,approximation))))": 320,
"opt(dictionary(hybrid(6,0),heuristic(use_first(halving,delta_largest))))": 502,
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"opt(runs(heuristic(use_first(halving,approximation))))": 268,
"opt(runs(heuristic(use_first(halving,delta_largest))))": 270
}
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