Updating server dependancies (#5249)

vendor/github.com/disintegration/imaging/histogram_test.go

@@ -0,0 +1,42 @@
+package imaging
+
+import (
+	"image"
+	"image/color"
+	"testing"
+)
+
+func TestHistogram(t *testing.T) {
+	b := image.Rectangle{image.Point{0, 0}, image.Point{2, 2}}
+
+	i1 := image.NewRGBA(b)
+	i1.Set(0, 0, image.Black)
+	i1.Set(1, 0, image.White)
+	i1.Set(1, 1, image.White)
+	i1.Set(0, 1, color.Gray{123})
+
+	h := Histogram(i1)
+	if h[0] != 0.25 || h[123] != 0.25 || h[255] != 0.5 {
+		t.Errorf("Incorrect histogram for image i1")
+	}
+
+	i2 := image.NewRGBA(b)
+	i2.Set(0, 0, color.Gray{51})
+	i2.Set(0, 1, color.Gray{14})
+	i2.Set(1, 0, color.Gray{14})
+
+	h = Histogram(i2)
+	if h[14] != 0.5 || h[51] != 0.25 || h[0] != 0.25 {
+		t.Errorf("Incorrect histogram for image i2")
+	}
+
+	b = image.Rectangle{image.Point{0, 0}, image.Point{0, 0}}
+	i3 := image.NewRGBA(b)
+	h = Histogram(i3)
+	for _, val := range h {
+		if val != 0 {
+			t.Errorf("Histogram for an empty image should be a zero histogram.")
+			return 
+		}
+	}
+}