add test packages

These packages are not meant to be used; they exist only to test
the go command in various scenarios.

test.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"io"
+	"net/http"
+)
+
+func init() {
+	// For golang.org/issue/18660.
+	{
+		h := func(w http.ResponseWriter, req *http.Request) {
+			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+			io.WriteString(w, `<meta name="go-import" content="dmitri.shuralyov.com/test/go-get-issue-unicode git https://github.com/dmitshur-test/go-get-issue-unicode">`)
+		}
+		http.HandleFunc("/test/go-get-issue-unicode", h)
+		http.HandleFunc("/test/go-get-issue-unicode/испытание", h)
+	}
+
+	// For own module learning.
+	{
+		h := func(w http.ResponseWriter, req *http.Request) {
+			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+			io.WriteString(w, `<meta name="go-import" content="dmitri.shuralyov.com/test/modtest1 mod https://dmitri.shuralyov.com/test/moduleproxy">`)
+		}
+		http.HandleFunc("/test/modtest1", h)
+		http.HandleFunc("/test/modtest1/inner", h)
+		http.HandleFunc("/test/modtest1/inner/p", h)
+	}
+}