diff --git a/types/kv/helpers_test.go b/types/kv/helpers_test.go
new file mode 100644
index 0000000000..37e9f36853
--- /dev/null
+++ b/types/kv/helpers_test.go
@@ -0,0 +1,89 @@
+package kv_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/cosmos/cosmos-sdk/types/kv"
+)
+
+func TestAssertKeyAtLeastLength(t *testing.T) {
+	cases := []struct {
+		name        string
+		key         []byte
+		length      int
+		expectPanic bool
+	}{
+		{
+			name:        "Store key length is less than the given length",
+			key:         []byte("hello"),
+			length:      10,
+			expectPanic: true,
+		},
+		{
+			name:        "Store key length is equal to the given length",
+			key:         []byte("store-key"),
+			length:      9,
+			expectPanic: false,
+		},
+		{
+			name:        "Store key length is greater than the given length",
+			key:         []byte("unique"),
+			length:      3,
+			expectPanic: false,
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if tc.expectPanic {
+				assert.Panics(t, func() {
+					kv.AssertKeyAtLeastLength(tc.key, tc.length)
+				})
+				return
+			}
+			kv.AssertKeyAtLeastLength(tc.key, tc.length)
+		})
+	}
+}
+
+func TestAssertKeyLength(t *testing.T) {
+	cases := []struct {
+		name        string
+		key         []byte
+		length      int
+		expectPanic bool
+	}{
+		{
+			name:        "Store key length is less than the given length",
+			key:         []byte("hello"),
+			length:      10,
+			expectPanic: true,
+		},
+		{
+			name:        "Store key length is equal to the given length",
+			key:         []byte("store-key"),
+			length:      9,
+			expectPanic: false,
+		},
+		{
+			name:        "Store key length is greater than the given length",
+			key:         []byte("unique"),
+			length:      3,
+			expectPanic: true,
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if tc.expectPanic {
+				assert.Panics(t, func() {
+					kv.AssertKeyLength(tc.key, tc.length)
+				})
+				return
+			}
+			kv.AssertKeyLength(tc.key, tc.length)
+		})
+	}
+}