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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ext
import (
"fmt"
"strings"
"testing"
"github.com/google/cel-go/cel"
)
func TestLists(t *testing.T) {
listsTests := []struct {
expr string
err string
}{
{expr: `[1,2,3,4].slice(0, 4) == [1,2,3,4]`},
{expr: `[1,2,3,4].slice(0, 0) == []`},
{expr: `[1,2,3,4].slice(1, 1) == []`},
{expr: `[1,2,3,4].slice(4, 4) == []`},
{expr: `[1,2,3,4].slice(1, 3) == [2, 3]`},
{expr: `[1,2,3,4].slice(3, 0)`, err: "cannot slice(3, 0), start index must be less than or equal to end index"},
{expr: `[1,2,3,4].slice(0, 10)`, err: "cannot slice(0, 10), list is length 4"},
{expr: `[1,2,3,4].slice(-5, 10)`, err: "cannot slice(-5, 10), negative indexes not supported"},
{expr: `[1,2,3,4].slice(-5, -3)`, err: "cannot slice(-5, -3), negative indexes not supported"},
}
env := testListsEnv(t)
for i, tst := range listsTests {
tc := tst
t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
var asts []*cel.Ast
pAst, iss := env.Parse(tc.expr)
if iss.Err() != nil {
t.Fatalf("env.Parse(%v) failed: %v", tc.expr, iss.Err())
}
asts = append(asts, pAst)
cAst, iss := env.Check(pAst)
if iss.Err() != nil {
t.Fatalf("env.Check(%v) failed: %v", tc.expr, iss.Err())
}
asts = append(asts, cAst)
for _, ast := range asts {
prg, err := env.Program(ast)
if err != nil {
t.Fatalf("env.Program() failed: %v", err)
}
out, _, err := prg.Eval(cel.NoVars())
if tc.err != "" {
if err == nil {
t.Fatalf("got value %v, wanted error %s for expr: %s",
out.Value(), tc.err, tc.expr)
}
if !strings.Contains(err.Error(), tc.err) {
t.Errorf("got error %v, wanted error %s for expr: %s", err, tc.err, tc.expr)
}
} else if err != nil {
t.Fatal(err)
} else if out.Value() != true {
t.Errorf("got %v, wanted true for expr: %s", out.Value(), tc.expr)
}
}
})
}
}
func testListsEnv(t *testing.T, opts ...cel.EnvOption) *cel.Env {
t.Helper()
baseOpts := []cel.EnvOption{Lists()}
env, err := cel.NewEnv(append(baseOpts, opts...)...)
if err != nil {
t.Fatalf("cel.NewEnv(Lists()) failed: %v", err)
}
return env
}
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