utils tests

utils_test.go

@@ -0,0 +1,61 @@
+package imaging
+
+import (
+	"runtime"
+	"testing"
+)
+
+func testParallelN(enabled bool, n, procs int) bool {
+	data := make([]bool, n)
+	before := runtime.GOMAXPROCS(0)
+	runtime.GOMAXPROCS(procs)
+	parallel(n, func(start, end int) {
+		for i := start; i < end; i++ {
+			data[i] = true
+		}
+	})
+	for i := 0; i < n; i++ {
+		if data[i] != true {
+			return false
+		}
+	}
+	runtime.GOMAXPROCS(before)
+	return true
+}
+
+func TestParallel(t *testing.T) {
+	for _, e := range []bool{true, false} {
+		for _, n := range []int{1, 10, 100, 1000} {
+			for _, p := range []int{1, 2, 4, 8, 16, 100} {
+				if testParallelN(e, n, p) != true {
+					t.Errorf("test [parallel %v %d %d] failed", e, n, p)
+				}
+			}
+		}
+	}
+}
+
+func TestClamp(t *testing.T) {
+	td := []struct {
+		f float64
+		u uint8
+	}{
+		{0, 0},
+		{255, 255},
+		{128, 128},
+		{0.49, 0},
+		{0.50, 1},
+		{254.9, 255},
+		{254.0, 254},
+		{256, 255},
+		{2500, 255},
+		{-10, 0},
+		{127.6, 128},
+	}
+
+	for _, d := range td {
+		if clamp(d.f) != d.u {
+			t.Errorf("test [clamp %v %v] failed: %v", d.f, d.u, clamp(d.f))
+		}
+	}
+}