examples/returns: demonstrate return types

examples/returns/returns_test.go

@@ -0,0 +1,25 @@
+package returns
+
+import (
+	"testing"
+	"testing/quick"
+)
+
+//go:generate go run asm.go -out returns.s -stubs stub.go
+
+func TestFunctionsEqual(t *testing.T) {
+	cases := []struct {
+		f, g interface{}
+	}{
+		{Interval, func(s, n uint64) (uint64, uint64) { return s, s + n }},
+		{Butterfly, func(x0, x1 float64) (float64, float64) { return x0 + x1, x0 - x1 }},
+		{Septuple, func(b byte) [7]byte { return [...]byte{b, b, b, b, b, b, b} }},
+		{CriticalLine, func(t float64) complex128 { return complex(0.5, t) }},
+		{NewStruct, func(w uint16, p [2]float64, q uint64) Struct { return Struct{Word: w, Point: p, Quad: q} }},
+	}
+	for _, c := range cases {
+		if err := quick.CheckEqual(c.f, c.g, nil); err != nil {
+			t.Fatal(err)
+		}
+	}
+}