Rough tests for the clientAddr function.

server/server_test.go

+package main
+
+import (
+	"net"
+	"strconv"
+	"testing"
+)
+
+func TestClientAddr(t *testing.T) {
+	// good tests
+	for _, test := range []struct {
+		input    string
+		expected net.IP
+	}{
+		{"1.2.3.4", net.ParseIP("1.2.3.4")},
+		{"1:2::3:4", net.ParseIP("1:2::3:4")},
+	} {
+		useraddr := clientAddr(test.input)
+		host, port, err := net.SplitHostPort(useraddr)
+		if err != nil {
+			t.Errorf("clientAddr(%q) → SplitHostPort error %v", test.input, err)
+			continue
+		}
+		if !test.expected.Equal(net.ParseIP(host)) {
+			t.Errorf("clientAddr(%q) → host %q, not %v", test.input, host, test.expected)
+		}
+		portNo, err := strconv.Atoi(port)
+		if err != nil {
+			t.Errorf("clientAddr(%q) → port %q", test.input, port)
+			continue
+		}
+		if portNo == 0 {
+			t.Errorf("clientAddr(%q) → port %d", test.input, portNo)
+		}
+	}
+
+	// bad tests
+	for _, input := range []string{
+		"",
+		"abc",
+		"1.2.3.4.5",
+		"[12::34]",
+	} {
+		useraddr := clientAddr(input)
+		if useraddr != "" {
+			t.Errorf("clientAddr(%q) → %q, not %q", input, useraddr, "")
+		}
+	}
+}