interp_test.go

//
// Copyright 2019 Timothy E. Peoples
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//

package interp

import (
	"fmt"
	"testing"
)

func TestInterpolator(t *testing.T) {
	cases := []*intTestcase{
		{"foo${one}bar", "fooabcbar"},
		{"foo${${one}bar}", "fooshizzl"},
	}

	for i, tc := range cases {
		t.Run(fmt.Sprintf("T%d", i), tc.test)
	}
}

type intTestcase struct {
	in   string
	want string
}

func (tc *intTestcase) test(t *testing.T) {
	i := New(mkVars())

	if got, err := i.Interpolate(tc.in); err != nil || got != tc.want {
		t.Errorf("Interpolate(%q) == (%q, %v); wanted(%q, %v)", tc.in, got, err, tc.want, nil)
	}
}

func mkVars() testResolver {
	return testResolver(map[string]string{
		"one":    "abc",
		"abcbar": "shizzl",
	})
}

type testResolver map[string]string

func (tg testResolver) Resolve(s string) (Value, error) {
	if v, ok := tg[s]; ok {
		return v, nil
	}
	return "", fmt.Errorf("unknown var: %s", s)
}