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// Copyright 2019 Google Inc.
//
// 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 axes
import (
"image"
"testing"
"github.com/kylelemons/godebug/pretty"
)
type updateY struct {
minVal float64
maxVal float64
}
func TestY(t *testing.T) {
tests := []struct {
desc string
minVal float64
maxVal float64
update *updateY
cvsHeight int
maxWidth int
wantWidth int
want *YDetails
wantErr bool
}{
{
desc: "fails on canvas too small",
minVal: 0,
maxVal: 3,
cvsHeight: 1,
maxWidth: 2,
wantWidth: 2,
wantErr: true,
},
{
desc: "fails on maxWidth less than required width",
minVal: 0,
maxVal: 3,
cvsHeight: 2,
maxWidth: 1,
wantWidth: 2,
wantErr: true,
},
{
desc: "maxWidth equals required width",
minVal: 0,
maxVal: 3,
cvsHeight: 2,
wantWidth: 2,
maxWidth: 2,
want: &YDetails{
Width: 2,
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Scale: mustNewYScale(0, 3, 2, nonZeroDecimals),
Labels: []*Label{
{NewValue(0, nonZeroDecimals), image.Point{0, 1}},
{NewValue(1.72, nonZeroDecimals), image.Point{0, 0}},
},
},
},
{
desc: "maxWidth just accommodates the longest label",
minVal: 0,
maxVal: 3,
cvsHeight: 2,
wantWidth: 2,
maxWidth: 5,
want: &YDetails{
Width: 5,
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Scale: mustNewYScale(0, 3, 2, nonZeroDecimals),
Labels: []*Label{
{NewValue(0, nonZeroDecimals), image.Point{3, 1}},
{NewValue(1.72, nonZeroDecimals), image.Point{0, 0}},
},
},
},
{
desc: "maxWidth is more than we need",
minVal: 0,
maxVal: 3,
cvsHeight: 2,
wantWidth: 2,
maxWidth: 6,
want: &YDetails{
Width: 5,
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Scale: mustNewYScale(0, 3, 2, nonZeroDecimals),
Labels: []*Label{
{NewValue(0, nonZeroDecimals), image.Point{3, 1}},
{NewValue(1.72, nonZeroDecimals), image.Point{0, 0}},
},
},
},
}
for _, tc := range tests {
t.Run(tc.desc, func(t *testing.T) {
y := NewY(tc.minVal, tc.maxVal)
if tc.update != nil {
y.Update(tc.update.minVal, tc.update.maxVal)
}
gotWidth := y.RequiredWidth()
if gotWidth != tc.wantWidth {
t.Errorf("RequiredWidth => got %v, want %v", gotWidth, tc.wantWidth)
}
got, err := y.Details(tc.cvsHeight, tc.maxWidth)
if (err != nil) != tc.wantErr {
t.Errorf("Details => unexpected error: %v, wantErr: %v", err, tc.wantErr)
}
if err != nil {
return
}
if diff := pretty.Compare(tc.want, got); diff != "" {
t.Errorf("Details => unexpected diff (-want, +got):\n%s", diff)
}
})
}
}