morph/naming_test.go at main · seeruk/morph · GitHub

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package morph_test

import (
	"testing"

	"github.com/seeruk/morph"
	"github.com/seeruk/morph/spec"
	"github.com/seeruk/morph/types"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestMapperName(t *testing.T) {
	input := morph.NameInput{
		Source: types.Type{
			Name:    "User",
			Package: types.PackageRef{Name: "source"},
		},
		Target: types.Type{
			Name:    "Person",
			Package: types.PackageRef{Name: "target"},
		},
		Signature: spec.MapperSignature{
			Accepts: spec.ParameterKindPointer,
			Returns: spec.ParameterKindValue,
		},
	}

	tests := []struct {
		name  string
		templ string
		want  string
	}{
		{
			name:  "renders type names",
			templ: "Map{{ .Source.Type }}To{{ .Target.Type }}",
			want:  "MapUserToPerson",
		},
		{
			name:  "renders package and type names",
			templ: "Map{{ .Source.Package }}{{ .Source.Type }}To{{ .Target.Package }}{{ .Target.Type }}",
			want:  "MapSourceUserToTargetPerson",
		},
		{
			name:  "renders signature names as function name parts",
			templ: "Map{{ .Source.Type }}{{ .Signature.Accepts }}To{{ .Target.Type }}{{ .Signature.Returns }}",
			want:  "MapUserPointerToPersonValue",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := morph.MapperName(input, tt.templ)

			require.NoError(t, err)
			assert.Equal(t, tt.want, got)
		})
	}

	t.Run("should use zero-value signature parts as value", func(t *testing.T) {
		input := morph.NameInput{
			Source: types.Type{Name: "User"},
			Target: types.Type{Name: "Person"},
		}

		got, err := morph.MapperName(input, "Map{{ .Source.Type }}{{ .Signature.Accepts }}To{{ .Target.Type }}{{ .Signature.Returns }}")

		require.NoError(t, err)
		assert.Equal(t, "MapUserValueToPersonValue", got)
	})
}

func TestMapperName_Error(t *testing.T) {
	input := morph.NameInput{
		Source: types.Type{Name: "User"},
		Target: types.Type{Name: "Person"},
		Signature: spec.MapperSignature{
			Accepts: spec.ParameterKindPointer,
			Returns: spec.ParameterKindValue,
		},
	}

	tests := []struct {
		name       string
		templ      string
		wantErrMsg string
	}{
		{
			name:       "returns parse errors",
			templ:      "Map{{ if }}",
			wantErrMsg: "failed to parse template",
		},
		{
			name:       "returns execute errors",
			templ:      "Map{{ .Source.Name }}To{{ .Target.Name }}",
			wantErrMsg: "failed to execute template",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := morph.MapperName(input, tt.templ)

			require.Error(t, err)
			assert.Empty(t, got)
			assert.ErrorContains(t, err, tt.wantErrMsg)
		})
	}
}