go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/config/vars/vars_test.go (about)

     1  // Copyright 2020 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package vars
    16  
    17  import (
    18  	"context"
    19  	"fmt"
    20  	"testing"
    21  
    22  	. "github.com/smartystreets/goconvey/convey"
    23  	. "go.chromium.org/luci/common/testing/assertions"
    24  )
    25  
    26  func TestVarSet(t *testing.T) {
    27  	t.Parallel()
    28  
    29  	ctx := context.Background()
    30  
    31  	Convey("Works", t, func() {
    32  		vs := VarSet{}
    33  		vs.Register("a", func(context.Context) (string, error) { return "a_val", nil })
    34  		vs.Register("b", func(context.Context) (string, error) { return "b_val", nil })
    35  
    36  		out, err := vs.RenderTemplate(ctx, "${a}")
    37  		So(err, ShouldBeNil)
    38  		So(out, ShouldEqual, "a_val")
    39  
    40  		out, err = vs.RenderTemplate(ctx, "${a}${b}")
    41  		So(err, ShouldBeNil)
    42  		So(out, ShouldEqual, "a_valb_val")
    43  
    44  		out, err = vs.RenderTemplate(ctx, "${a}_${b}_${a}")
    45  		So(err, ShouldBeNil)
    46  		So(out, ShouldEqual, "a_val_b_val_a_val")
    47  	})
    48  
    49  	Convey("Error in the callback", t, func() {
    50  		vs := VarSet{}
    51  		vs.Register("a", func(context.Context) (string, error) { return "", fmt.Errorf("boom") })
    52  
    53  		_, err := vs.RenderTemplate(ctx, "zzz_${a}")
    54  		So(err, ShouldErrLike, "boom")
    55  	})
    56  
    57  	Convey("Missing var", t, func() {
    58  		vs := VarSet{}
    59  		vs.Register("a", func(context.Context) (string, error) { return "a_val", nil })
    60  
    61  		_, err := vs.RenderTemplate(ctx, "zzz_${a}_${zzz}_${a}")
    62  		So(err, ShouldErrLike, `no placeholder named "zzz" is registered`)
    63  	})
    64  
    65  	Convey("Double registration", t, func() {
    66  		vs := VarSet{}
    67  		vs.Register("a", func(context.Context) (string, error) { return "a_val", nil })
    68  
    69  		So(func() { vs.Register("a", func(context.Context) (string, error) { return "a_val", nil }) }, ShouldPanic)
    70  	})
    71  }