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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| package rand | ||
|
|
||
| import ( | ||
| "math/rand" | ||
|
|
||
| simtypes "github.com/cosmos/cosmos-sdk/types/simulation" | ||
| ) | ||
|
|
||
| // SelectAccounts selects count accounts from the ones provided. | ||
| func SelectAccounts(r *rand.Rand, accs []simtypes.Account, count int) ([]simtypes.Account, error) { | ||
| return SelectEntries(r, accs, count, "accounts") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| package rand | ||
|
|
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| import "math/rand" | ||
|
|
||
| // IntBetween generates a random number between min and max inclusive. | ||
| func IntBetween(r *rand.Rand, min, max int) int { | ||
| return r.Intn(max-min+1) + min | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| package rand | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "math/rand" | ||
| "slices" | ||
| "testing" | ||
|
|
||
| internalcollections "github.com/provenance-io/provenance/internal/collections" | ||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestIntBetween(t *testing.T) { | ||
| tests := []struct { | ||
| min int | ||
| max int | ||
| expPanic bool | ||
| }{ | ||
| {min: 0, max: 0}, | ||
| {min: 0, max: 10}, | ||
| {min: 1, max: 1}, | ||
| {min: -1, max: -1}, | ||
| {min: 1, max: 0, expPanic: true}, | ||
| {min: 0, max: -1, expPanic: true}, | ||
| {min: 1, max: -1, expPanic: true}, | ||
| {min: 10, max: -20, expPanic: true}, | ||
| {min: 10, max: -11, expPanic: true}, | ||
| {min: 10, max: -10, expPanic: true}, | ||
| {min: 10, max: -9, expPanic: true}, | ||
| {min: 10, max: 9, expPanic: true}, | ||
| {min: 10, max: 10}, | ||
| {min: 10, max: 11}, | ||
| {min: 10, max: 20}, | ||
| {min: -10, max: -11, expPanic: true}, | ||
| {min: -10, max: -10}, | ||
| {min: -10, max: -9}, | ||
| {min: -10, max: 9}, | ||
| {min: -10, max: 10}, | ||
| {min: -10, max: 11}, | ||
| {min: -20, max: -1}, | ||
| {min: -20, max: 0}, | ||
| {min: -20, max: 1}, | ||
| {min: 1001, max: 1100}, | ||
| {min: -1778, max: -1670}, | ||
| } | ||
|
|
||
| for _, tc := range tests { | ||
| name := fmt.Sprintf("RandIntBetween(%d, %d)", tc.min, tc.max) | ||
| if tc.expPanic { | ||
| name += " panics" | ||
| } | ||
|
|
||
| t.Run(name, func(t *testing.T) { | ||
| r := rand.New(rand.NewSource(1)) | ||
| // Check for panic for the first try. | ||
| seen := make(map[int]bool) | ||
| testFunc := func() { | ||
| val := IntBetween(r, tc.min, tc.max) | ||
| seen[val] = true | ||
| } | ||
| if tc.expPanic { | ||
| require.PanicsWithValue(t, "invalid argument to Intn", testFunc) | ||
| return | ||
| } | ||
| require.NotPanics(t, testFunc) | ||
|
|
||
| count := tc.max - tc.min + 1 | ||
| expected := make([]int, 0, count) | ||
| for i := tc.min; i <= tc.max; i++ { | ||
| expected = append(expected, i) | ||
| } | ||
|
|
||
| // Run it a bunch of times, trying to get it to return all possible values. | ||
| // I chose count*100 to essentially give each value 100 chances to be chosen, but be | ||
| // low enough to still finish pretty quickly if one or more values never gets returned. | ||
| for i := 0; i < count*100 && len(seen) < count; i++ { | ||
| testFunc() | ||
| } | ||
| // Make sure both the min and max were returned at some point. | ||
| assert.True(t, seen[tc.min], "minimum value %d in seen map", tc.min) | ||
| assert.True(t, seen[tc.max], "maximum value %d in seen map", tc.max) | ||
|
|
||
| seenVals := internalcollections.Keys(seen) | ||
| slices.Sort(seenVals) | ||
| // Make sure the smallest and largest are as expected. | ||
| assert.Equal(t, tc.min, seenVals[0], "smallest number generated") | ||
| assert.Equal(t, tc.max, seenVals[len(seenVals)-1], "largest number generated") | ||
| // Make sure all values were generated. This check technically covers the previous ones, | ||
| // but I've got them split out like this for friendlier test failure messages. | ||
| assert.Equal(t, expected, seenVals, "values generated") | ||
| }) | ||
| } | ||
| } |
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