From 2de851d5bd7ca15cbf72d3cf643ad8c44ff0adbe Mon Sep 17 00:00:00 2001
From: dauTT <dautruongtan@gmail.com>
Date: Sun, 12 Jul 2020 04:26:38 +0200
Subject: [PATCH] Merge PR #6693: x/staking/simulation/params.go: add unit
 tests

---
 x/staking/simulation/params_test.go | 37 +++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 x/staking/simulation/params_test.go

diff --git a/x/staking/simulation/params_test.go b/x/staking/simulation/params_test.go
new file mode 100644
index 000000000..cb52bba00
--- /dev/null
+++ b/x/staking/simulation/params_test.go
@@ -0,0 +1,37 @@
+package simulation_test
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/cosmos/cosmos-sdk/x/staking/simulation"
+)
+
+func TestParamChanges(t *testing.T) {
+	s := rand.NewSource(1)
+	r := rand.New(s)
+
+	expected := []struct {
+		composedKey string
+		key         string
+		simValue    string
+		subspace    string
+	}{
+		{"staking/MaxValidators", "MaxValidators", "82", "staking"},
+		{"staking/UnbondingTime", "UnbondingTime", "\"275307000000000\"", "staking"},
+		{"staking/HistoricalEntries", "HistoricalEntries", "29", "staking"},
+	}
+
+	paramChanges := simulation.ParamChanges(r)
+
+	require.Len(t, paramChanges, 3)
+
+	for i, p := range paramChanges {
+		require.Equal(t, expected[i].composedKey, p.ComposedKey())
+		require.Equal(t, expected[i].key, p.Key())
+		require.Equal(t, expected[i].simValue, p.SimValue()(r))
+		require.Equal(t, expected[i].subspace, p.Subspace())
+	}
+}