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selection_test.go
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selection_test.go
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package dbfailover
import (
"database/sql"
"testing"
"time"
)
func TestMakeSelection(t *testing.T) {
db1 := &sql.DB{}
db2 := &sql.DB{}
db3 := &sql.DB{}
tests := []struct {
msg string
states map[*sql.DB]dbStatus
lastMaster *sql.DB
want selection
}{
{
msg: "nil",
},
{
msg: "single master",
states: map[*sql.DB]dbStatus{
db1: {role: roleMaster},
},
want: selection{
master: db1,
slave: db1,
lastMaster: db1,
},
},
{
msg: "keep lastMaster",
states: map[*sql.DB]dbStatus{},
lastMaster: db1,
want: selection{
master: nil,
slave: nil,
lastMaster: db1,
},
},
{
msg: "one_master_one_slave",
states: map[*sql.DB]dbStatus{
db1: {role: roleMaster},
db2: {role: roleSlave},
},
want: selection{
master: db1,
slave: db2,
lastMaster: db1,
},
},
{
msg: "one master two slaves pick lowest latency",
states: map[*sql.DB]dbStatus{
db1: {role: roleMaster, latency: 1 * time.Second},
db2: {role: roleSlave, latency: 5 * time.Second},
db3: {role: roleSlave, latency: 2 * time.Second},
},
want: selection{
master: db1,
slave: db3,
lastMaster: db1,
},
},
{
msg: "two masters one slave pick lowest latency",
states: map[*sql.DB]dbStatus{
db1: {role: roleMaster, latency: 5 * time.Second},
db2: {role: roleMaster, latency: 2 * time.Second},
db3: {role: roleSlave, latency: 1 * time.Second},
},
want: selection{
master: db2,
slave: db3,
lastMaster: db2,
},
},
{
msg: "slave only",
states: map[*sql.DB]dbStatus{
db1: {role: roleSlave},
},
lastMaster: db2,
want: selection{
master: nil,
slave: db1,
lastMaster: db2,
},
},
{
msg: "offline only",
states: map[*sql.DB]dbStatus{
db1: {role: roleOffline},
db2: {role: roleOffline},
db3: {role: roleOffline},
},
want: selection{
master: nil,
slave: nil,
lastMaster: nil,
},
},
}
for _, test := range tests {
t.Run(test.msg, func(t *testing.T) {
actual := makeSelection(test.states, test.lastMaster)
if actual != test.want {
t.Errorf("expected %v, got %v", test.want, actual)
}
})
}
}