Add Task DB implementation using a local BoltDB.

build_scheduler/go/db/testutil.go

 package db
 
 import (
         "net/url"
         "testing"
         "time"
 
         assert "github.com/stretchr/testify/require"
 
         "go.skia.org/infra/go/testutils"
 )
 
 func makeTask(ts time.Time, commits []string) *Task {
         return &Task{
                 Created: ts,
                 Commits: commits,
                 Name:    "Test-Task",
         }
 }
 
-func testDB(t *testing.T, db DB) {
+func TestDB(t *testing.T, db DB) {
         defer testutils.AssertCloses(t, db)
 
         _, err := db.GetModifiedTasks("dummy-id")
         assert.True(t, IsUnknownId(err))
 
         id, err := db.StartTrackingModifiedTasks()
         assert.NoError(t, err)
 
         tasks, err := db.GetModifiedTasks(id)
         assert.NoError(t, err)
@@ skipping 111 matching lines @@
 
         tasks, err = db.GetTasksFromDateRange(t3Before, timeEnd)
         assert.NoError(t, err)
         testutils.AssertDeepEqual(t, []*Task{t3}, tasks)
 
         tasks, err = db.GetTasksFromDateRange(t3After, timeEnd)
         assert.NoError(t, err)
         testutils.AssertDeepEqual(t, []*Task{}, tasks)
 }
 
-func testTooManyUsers(t *testing.T, db DB) {
+func TestTooManyUsers(t *testing.T, db DB) {
         defer testutils.AssertCloses(t, db)
 
         // Max out the number of modified-tasks users; ensure that we error out.
         for i := 0; i < MAX_MODIFIED_BUILDS_USERS; i++ {
                 _, err := db.StartTrackingModifiedTasks()
                 assert.NoError(t, err)
         }
         _, err := db.StartTrackingModifiedTasks()
         assert.True(t, IsTooManyUsers(err))
 }
-
-func TestInMemoryDB(t *testing.T) {
-        testDB(t, NewInMemoryDB())
-}
-
-func TestInMemoryTooManyUsers(t *testing.T) {
-        testTooManyUsers(t, NewInMemoryDB())
-}