tendermint/test/e2e/generator/random_test.go

package main

import (
	"fmt"
	"math/rand"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestCombinations(t *testing.T) {
	input := map[string][]interface{}{
		"bool":   {false, true},
		"int":    {1, 2, 3},
		"string": {"foo", "bar"},
	}

	c := combinations(input)
	assert.Equal(t, []map[string]interface{}{
		{"bool": false, "int": 1, "string": "foo"},
		{"bool": false, "int": 1, "string": "bar"},
		{"bool": false, "int": 2, "string": "foo"},
		{"bool": false, "int": 2, "string": "bar"},
		{"bool": false, "int": 3, "string": "foo"},
		{"bool": false, "int": 3, "string": "bar"},
		{"bool": true, "int": 1, "string": "foo"},
		{"bool": true, "int": 1, "string": "bar"},
		{"bool": true, "int": 2, "string": "foo"},
		{"bool": true, "int": 2, "string": "bar"},
		{"bool": true, "int": 3, "string": "foo"},
		{"bool": true, "int": 3, "string": "bar"},
	}, c)
}

func TestUniformSetChoice(t *testing.T) {
	set := uniformSetChoice([]string{"a", "b", "c"})
	r := rand.New(rand.NewSource(2384))

	for i := 0; i < 100; i++ {
		t.Run(fmt.Sprintf("Iteration%03d", i), func(t *testing.T) {
			set = append(set, t.Name())

			t.Run("ChooseAtLeastSubset", func(t *testing.T) {
				require.True(t, len(set.ChooseAtLeast(r, 1)) >= 1)
				require.True(t, len(set.ChooseAtLeast(r, 2)) >= 2)
				require.True(t, len(set.ChooseAtLeast(r, len(set)/2)) >= len(set)/2)
			})
			t.Run("ChooseAtLeastEqualOrGreaterToLength", func(t *testing.T) {
				require.Len(t, set.ChooseAtLeast(r, len(set)), len(set))
				require.Len(t, set.ChooseAtLeast(r, len(set)+1), len(set))
				require.Len(t, set.ChooseAtLeast(r, len(set)*10), len(set))
			})
			t.Run("ChooseSingle", func(t *testing.T) {
				require.True(t, len(set.Choose(r)) >= 1)
			})
		})
	}
}