test: add slice tests

testdata/slice.go

@@ -0,0 +1,29 @@
+package main
+
+func main() {
+	l := 5
+	foo := []int{1, 2, 4, 5}
+	bar := make([]int, l-2, l)
+	printslice("foo", foo)
+	printslice("bar", bar)
+	printslice("foo[1:2]", foo[1:2])
+	println("sum foo:", sum(foo))
+	println("copy foo -> bar:", copy(bar, foo))
+	printslice("bar", bar)
+}
+
+func printslice(name string, s []int) {
+	print(name, ": len=", len(s), " cap=", cap(s), " data:")
+	for _, n := range s {
+		print(" ", n)
+	}
+	println()
+}
+
+func sum(l []int) int {
+	sum := 0
+	for _, n := range l {
+		sum += n
+	}
+	return sum
+}

testdata/slice.txt

@@ -0,0 +1,6 @@
+foo: len=4 cap=4 data: 1 2 4 5
+bar: len=3 cap=5 data: 0 0 0
+foo[1:2]: len=1 cap=3 data: 2
+sum foo: 12
+copy foo -> bar: 3
+bar: len=3 cap=5 data: 1 2 4