「goapp test」が予想外のエラーを出して困っている件 #Go

このエラーにビビッときたらコメントを。

環境

Google App Engine SDK のインストール
Go のインストール
Git のインストール

versions

>goapp version
go version go1.6.3 (appengine-1.9.46) windows/amd64

>go version
go version go1.7.1 windows/amd64

>git version
git version 2.11.0.windows.3

テストコード

package sample

import (
    "testing"

    "google.golang.org/appengine/aetest"
    "google.golang.org/appengine/memcache"
)

func TestFoo(t *testing.T) {
    ctx, done, err := aetest.NewContext()
    if err != nil {
        t.Fatal(err)
    }

    defer done()

    it := &memcache.Item{
        Key:   "some-key",
        Value: []byte("some-value"),
    }
    err = memcache.Set(ctx, it)
    if err != nil {
        t.Fatalf("Set err: %v", err)
    }
    it, err = memcache.Get(ctx, "some-key")
    if err != nil {
        t.Fatalf("Get err: %v; want no error", err)
    }
    if g, w := string(it.Value), "some-value"; g != w {
        t.Errorf("retrieved Item.Value = %q, want %q", g, w)
    }
}

goapp test！

エラーコード

>goapp test
2017/01/25 14:19:20 appengine: not running under devappserver2; using some default configuration
INFO     2017-01-25 14:19:23,394 devappserver2.py:756] Skipping SDK update check.
WARNING  2017-01-25 14:19:23,394 devappserver2.py:772] DEFAULT_VERSION_HOSTNAME will not be set correctly with --port=0
Traceback (most recent call last):
  File "C:\go_appengine\\dev_appserver.py", line 94, in <module>
    _run_file(__file__, globals())
  File "C:\go_appengine\\dev_appserver.py", line 90, in _run_file
    execfile(_PATHS.script_file(script_name), globals_)
  File "C:\go_appengine\google\appengine\tools\devappserver2\devappserver2.py", line 1027, in <module>
    main()
  File "C:\go_appengine\google\appengine\tools\devappserver2\devappserver2.py", line 1015, in main
    dev_server.start(options)
  File "C:\go_appengine\google\appengine\tools\devappserver2\devappserver2.py", line 807, in start
    request_data, storage_path, options, configuration)
  File "C:\go_appengine\google\appengine\tools\devappserver2\devappserver2.py", line 907, in _create_api_server
    appidentity_oauth_url=options.appidentity_oauth_url)
  File "C:\go_appengine\google\appengine\tools\devappserver2\api_server.py", line 421, in setup_stubs
    auto_id_policy=datastore_auto_id_policy)
  File "C:\go_appengine\google\appengine\datastore\datastore_sqlite_stub.py", line 615, in __init__
    factory=sql_conn)
sqlite3.OperationalError: unable to open database file
--- FAIL: TestFoo (3.20s)
sample_test.go:13: unable to find admin server URL
FAIL
exit status 1

単体テストできないつらみ

自前の環境が壊れてるから失敗しているはずだと、仮想マシンにWindows10のクリーン環境を用意して、同じ手順にて試すも同じエラーが出て意気消沈。

sqlite3.OperationalError: unable to open database file
sample_test.go:13: unable to find admin server URL