expr/test/issues/785/issue_test.go

package issue_test

import (
	"testing"

	"github.com/expr-lang/expr"
	"github.com/expr-lang/expr/internal/testify/require"
)

func TestIssue785(t *testing.T) {
	emptyMap := map[string]any{}

	env := map[string]interface{}{
		"empty_map": emptyMap,
	}

	{
		code := `get(empty_map, "non_existing_key") | get("some_key") | get("another_key") | get("yet_another_key") | get("last_key")`

		program, err := expr.Compile(code, expr.Env(env))
		require.NoError(t, err)

		output, err := expr.Run(program, env)
		require.NoError(t, err)
		require.Equal(t, nil, output)
	}

	{
		code := `{} | get("non_existing_key") | get("some_key") | get("another_key") | get("yet_another_key") | get("last_key")`

		program, err := expr.Compile(code, expr.Env(env))
		require.NoError(t, err)

		output, err := expr.Run(program, env)
		require.NoError(t, err)
		require.Equal(t, nil, output)
	}
}