moving averages! dashes!

ring_buffer_test.go

@@ -0,0 +1,162 @@
+package chart
+
+import (
+	"testing"
+
+	"github.com/blendlabs/go-assert"
+)
+
+func TestRingBuffer(t *testing.T) {
+	assert := assert.New(t)
+
+	buffer := NewRingBuffer()
+
+	buffer.Enqueue(1)
+	assert.Equal(1, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(1, buffer.PeekBack())
+
+	buffer.Enqueue(2)
+	assert.Equal(2, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(2, buffer.PeekBack())
+
+	buffer.Enqueue(3)
+	assert.Equal(3, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(3, buffer.PeekBack())
+
+	buffer.Enqueue(4)
+	assert.Equal(4, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(4, buffer.PeekBack())
+
+	buffer.Enqueue(5)
+	assert.Equal(5, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(5, buffer.PeekBack())
+
+	buffer.Enqueue(6)
+	assert.Equal(6, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(6, buffer.PeekBack())
+
+	buffer.Enqueue(7)
+	assert.Equal(7, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(7, buffer.PeekBack())
+
+	buffer.Enqueue(8)
+	assert.Equal(8, buffer.Len())
+	assert.Equal(1, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value := buffer.Dequeue()
+	assert.Equal(1, value)
+	assert.Equal(7, buffer.Len())
+	assert.Equal(2, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value = buffer.Dequeue()
+	assert.Equal(2, value)
+	assert.Equal(6, buffer.Len())
+	assert.Equal(3, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value = buffer.Dequeue()
+	assert.Equal(3, value)
+	assert.Equal(5, buffer.Len())
+	assert.Equal(4, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value = buffer.Dequeue()
+	assert.Equal(4, value)
+	assert.Equal(4, buffer.Len())
+	assert.Equal(5, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value = buffer.Dequeue()
+	assert.Equal(5, value)
+	assert.Equal(3, buffer.Len())
+	assert.Equal(6, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value = buffer.Dequeue()
+	assert.Equal(6, value)
+	assert.Equal(2, buffer.Len())
+	assert.Equal(7, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value = buffer.Dequeue()
+	assert.Equal(7, value)
+	assert.Equal(1, buffer.Len())
+	assert.Equal(8, buffer.Peek())
+	assert.Equal(8, buffer.PeekBack())
+
+	value = buffer.Dequeue()
+	assert.Equal(8, value)
+	assert.Equal(0, buffer.Len())
+	assert.Nil(buffer.Peek())
+	assert.Nil(buffer.PeekBack())
+}
+
+func TestRingBufferClear(t *testing.T) {
+	assert := assert.New(t)
+
+	buffer := NewRingBuffer()
+	buffer.Enqueue(1)
+	buffer.Enqueue(1)
+	buffer.Enqueue(1)
+	buffer.Enqueue(1)
+	buffer.Enqueue(1)
+	buffer.Enqueue(1)
+	buffer.Enqueue(1)
+	buffer.Enqueue(1)
+
+	assert.Equal(8, buffer.Len())
+
+	buffer.Clear()
+	assert.Equal(0, buffer.Len())
+	assert.Nil(buffer.Peek())
+	assert.Nil(buffer.PeekBack())
+}
+
+func TestRingBufferAsSlice(t *testing.T) {
+	assert := assert.New(t)
+
+	buffer := NewRingBuffer()
+	buffer.Enqueue(1)
+	buffer.Enqueue(2)
+	buffer.Enqueue(3)
+	buffer.Enqueue(4)
+	buffer.Enqueue(5)
+
+	contents := buffer.AsSlice()
+	assert.Len(contents, 5)
+	assert.Equal(1, contents[0])
+	assert.Equal(2, contents[1])
+	assert.Equal(3, contents[2])
+	assert.Equal(4, contents[3])
+	assert.Equal(5, contents[4])
+}
+
+func TestRingBufferEach(t *testing.T) {
+	assert := assert.New(t)
+
+	buffer := NewRingBuffer()
+
+	for x := 1; x < 17; x++ {
+		buffer.Enqueue(x)
+	}
+
+	called := 0
+	buffer.Each(func(v interface{}) {
+		if typed, isTyped := v.(int); isTyped {
+			if typed == (called + 1) {
+				called++
+			}
+		}
+	})
+
+	assert.Equal(16, called)
+}