feat: support line chart draw function

util_test.go

@@ -0,0 +1,121 @@
+// 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"
+	"github.com/wcharczuk/go-chart/v2"
+)
+
+func TestGetDefaultInt(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(1, getDefaultInt(0, 1))
+	assert.Equal(10, getDefaultInt(10, 1))
+}
+
+func TestAutoDivide(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal([]int{
+		0,
+		86,
+		172,
+		258,
+		344,
+		430,
+		515,
+		600,
+	}, autoDivide(600, 7))
+}
+
+func TestMaxInt(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(5, maxInt(1, 3, 5, 2))
+}
+
+func TestMeasureTextMaxWidthHeight(t *testing.T) {
+	assert := assert.New(t)
+	r, err := chart.SVG(400, 300)
+	assert.Nil(err)
+	style := chart.Style{
+		FontSize: 10,
+	}
+	style.Font, _ = chart.GetDefaultFont()
+	style.WriteToRenderer(r)
+
+	maxWidth, maxHeight := measureTextMaxWidthHeight([]string{
+		"Mon",
+		"Tue",
+		"Wed",
+		"Thu",
+		"Fri",
+		"Sat",
+		"Sun",
+	}, r)
+	assert.Equal(26, maxWidth)
+	assert.Equal(12, maxHeight)
+}
+
+func TestReverseSlice(t *testing.T) {
+	assert := assert.New(t)
+
+	arr := []string{
+		"Mon",
+		"Tue",
+		"Wed",
+		"Thu",
+		"Fri",
+		"Sat",
+		"Sun",
+	}
+	reverseStringSlice(arr)
+	assert.Equal([]string{
+		"Sun",
+		"Sat",
+		"Fri",
+		"Thu",
+		"Wed",
+		"Tue",
+		"Mon",
+	}, arr)
+
+	numbers := []int{
+		1,
+		3,
+		5,
+		7,
+		9,
+	}
+	reverseIntSlice(numbers)
+	assert.Equal([]int{
+		9,
+		7,
+		5,
+		3,
+		1,
+	}, numbers)
+}