feat: support title render function

range_test.go

@@ -0,0 +1,49 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// 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 charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRange(t *testing.T) {
+	assert := assert.New(t)
+
+	r := NewRange(0, 8, 6)
+	assert.Equal(0.0, r.Min)
+	assert.Equal(30.0, r.Max)
+
+	r = NewRange(0, 12, 6)
+	assert.Equal(0.0, r.Min)
+	assert.Equal(30.0, r.Max)
+
+	r = NewRange(-13, 18, 6)
+	assert.Equal(-20.0, r.Min)
+	assert.Equal(40.0, r.Max)
+
+	r = NewRange(0, 400, 6)
+	assert.Equal(0.0, r.Min)
+	assert.Equal(480.0, r.Max)
+}