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package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestMigrationNumber(t *testing.T) {
	n := len(migrations)

	entries, err := os.ReadDir(migrationDir)
	if err != nil {
		t.Fatalf("Failed to determine number of migration files: %v", err)
	}
	expectation := len(entries)

	if n != expectation {
		t.Fatalf("Expected %d migration files but got %d.", expectation, n)
	}
}

func TestMigrationContent(t *testing.T) {
	for i, migration := range migrations {
		name := fmt.Sprintf(migrationFilePattern, i+1)
		path := filepath.Join(migrationDir, name)

		expectation := fmt.Sprintf("PRAGMA user_version = %d;", i+1)
		if !strings.HasPrefix(migration, expectation) {
			t.Fatalf("Expected '%s' at start of '%s'.", expectation, path)
		}

		n := strings.Count(migration, `user_version`)
		if n != 1 {
			t.Fatalf(
				"'user_version' was mentioned more than once in %s. "+
				"This is likely not intended.",
				path,
			)
		}
	}
}