From 069ee93de17579230ef749d5804df7a0ac350ac5 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Sun, 1 Aug 2021 17:54:53 -0600
Subject: implemented PoW backend

---
 srv/pow/pow_test.go | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 srv/pow/pow_test.go

(limited to 'srv/pow/pow_test.go')

diff --git a/srv/pow/pow_test.go b/srv/pow/pow_test.go
new file mode 100644
index 0000000..4bc4141
--- /dev/null
+++ b/srv/pow/pow_test.go
@@ -0,0 +1,120 @@
+package pow
+
+import (
+	"encoding/hex"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tilinna/clock"
+)
+
+func TestChallengeParams(t *testing.T) {
+	tests := []challengeParams{
+		{},
+		{
+			Target:    1,
+			ExpiresAt: 3,
+		},
+		{
+			Target:    2,
+			ExpiresAt: -10,
+			Random:    []byte{0, 1, 2},
+		},
+		{
+			Random: []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
+		},
+	}
+
+	t.Run("marshal_unmarshal", func(t *testing.T) {
+		for i, test := range tests {
+			t.Run(strconv.Itoa(i), func(t *testing.T) {
+				b, err := test.MarshalBinary()
+				assert.NoError(t, err)
+
+				var c2 challengeParams
+				assert.NoError(t, c2.UnmarshalBinary(b))
+				assert.Equal(t, test, c2)
+
+				b2, err := c2.MarshalBinary()
+				assert.NoError(t, err)
+				assert.Equal(t, b, b2)
+			})
+		}
+	})
+
+	secret := []byte("shhh")
+
+	t.Run("to_from_seed", func(t *testing.T) {
+
+		for i, test := range tests {
+			t.Run(strconv.Itoa(i), func(t *testing.T) {
+				seed, err := newSeed(test, secret)
+				assert.NoError(t, err)
+
+				// generating seed should be deterministic
+				seed2, err := newSeed(test, secret)
+				assert.NoError(t, err)
+				assert.Equal(t, seed, seed2)
+
+				c, err := challengeParamsFromSeed(seed, secret)
+				assert.NoError(t, err)
+				assert.Equal(t, test, c)
+			})
+		}
+	})
+
+	t.Run("malformed_seed", func(t *testing.T) {
+		tests := []string{
+			"",
+			"01",
+			"0000",
+			"00374a1ad84d6b7a93e68042c1f850cbb100000000000000000000000000000102030405060708A0", // changed one byte from a good seed
+		}
+
+		for i, test := range tests {
+			t.Run(strconv.Itoa(i), func(t *testing.T) {
+				seed, err := hex.DecodeString(test)
+				if err != nil {
+					panic(err)
+				}
+
+				_, err = challengeParamsFromSeed(seed, secret)
+				assert.ErrorIs(t, errMalformedSeed, err)
+			})
+		}
+	})
+}
+
+func TestManager(t *testing.T) {
+	clock := clock.NewMock(time.Now().Truncate(time.Hour))
+
+	store := NewMemoryStore(clock)
+	defer store.Close()
+
+	mgr := NewManager(ManagerParams{
+		Clock:            clock,
+		Store:            store,
+		Secret:           []byte("shhhh"),
+		Target:           0x00FFFFFF,
+		ChallengeTimeout: 1 * time.Second,
+	})
+
+	{
+		c := mgr.NewChallenge()
+		solution := Solve(c)
+		assert.NoError(t, mgr.CheckSolution(c.Seed, solution))
+
+		// doing again should fail, the seed should already be marked as solved
+		assert.ErrorIs(t, mgr.CheckSolution(c.Seed, solution), ErrSeedSolved)
+	}
+
+	{
+		c := mgr.NewChallenge()
+		solution := Solve(c)
+		clock.Add(2 * time.Second)
+		assert.ErrorIs(t, mgr.CheckSolution(c.Seed, solution), ErrExpiredSolution)
+	}
+
+}
-- 
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