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file_system_store_test.go
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file_system_store_test.go
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package poker
import (
"os"
"testing"
)
func TestFileSystemStore(t *testing.T) {
t.Run("returns league sorted", func(t *testing.T) {
database, cleanDatabase := createTempFile(t, `[
{"Name": "Cleo", "Wins": 10},
{"Name": "Chris", "Wins": 33}]`)
defer cleanDatabase()
store, err := NewFileSystemPlayerStore(database)
AssertNoError(t, err)
got := store.GetLeague()
want := League{
{"Chris", 33},
{"Cleo", 10},
}
AssertLeague(t, got, want)
got = store.GetLeague()
AssertLeague(t, got, want)
})
t.Run("get player score", func(t *testing.T) {
database, cleanDatabase := createTempFile(t, `[
{"Name": "Cleo", "Wins": 10},
{"Name": "Chris", "Wins": 33}
]`)
defer cleanDatabase()
store, err := NewFileSystemPlayerStore(database)
AssertNoError(t, err)
got := store.GetPlayerScore("Chris")
want := 33
AssertScoreEquals(t, got, want)
})
t.Run("store wins for existing players", func(t *testing.T) {
database, cleanDatabase := createTempFile(t, `[
{"Name": "Cleo", "Wins": 10},
{"Name": "Chris", "Wins": 33}
]`)
defer cleanDatabase()
store, err := NewFileSystemPlayerStore(database)
AssertNoError(t, err)
store.RecordWin("Chris")
got := store.GetPlayerScore("Chris")
want := 34
AssertScoreEquals(t, got, want)
})
t.Run("store wins for new players", func(t *testing.T) {
database, cleanDatabase := createTempFile(t, `[
{"Name": "Cleo", "Wins": 10},
{"Name": "Chris", "Wins": 33}]`)
defer cleanDatabase()
store, err := NewFileSystemPlayerStore(database)
AssertNoError(t, err)
store.RecordWin("Pepper")
got := store.GetPlayerScore("Pepper")
want := 1
AssertScoreEquals(t, got, want)
})
t.Run("works with an empty file", func(t *testing.T) {
database, cleanDatabase := createTempFile(t, "")
defer cleanDatabase()
_, err := NewFileSystemPlayerStore(database)
AssertNoError(t, err)
})
}
func createTempFile(t testing.TB, initialData string) (*os.File, func()) {
t.Helper()
tmpfile, err := os.CreateTemp("", "db")
if err != nil {
t.Fatalf("could not create temp file %v", err)
}
tmpfile.Write([]byte(initialData))
removeFile := func() {
tmpfile.Close()
os.Remove(tmpfile.Name())
}
return tmpfile, removeFile
}
func AssertScoreEquals(t testing.TB, got, want int) {
t.Helper()
if got != want {
t.Errorf("wrong score received. got %d, want %d", got, want)
}
}
func AssertNoError(t testing.TB, err error) {
t.Helper()
if err != nil {
t.Fatalf("didn't expect an error but got one, %v", err)
}
}