Phase 1: data layer (SQLite, migrations, models, seed)

internal/db/db_test.go

@@ -0,0 +1,77 @@
+package db
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestOpenMigratesAndSeeds(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "test.db")
+
+	d, err := Open(path)
+	if err != nil {
+		t.Fatalf("first open: %v", err)
+	}
+
+	// Local user is seeded.
+	var email string
+	if err := d.QueryRow(`SELECT email FROM users WHERE id = ?`, LocalUserID).Scan(&email); err != nil {
+		t.Fatalf("local user not seeded: %v", err)
+	}
+
+	// All expected tables exist.
+	for _, table := range []string{"users", "documents", "suggestions", "plagiarism_reports", "schema_migrations"} {
+		var name string
+		err := d.QueryRow(`SELECT name FROM sqlite_master WHERE type='table' AND name=?`, table).Scan(&name)
+		if err != nil {
+			t.Errorf("table %q missing: %v", table, err)
+		}
+	}
+
+	// The voice suggestion type is permitted by the CHECK constraint.
+	if _, err := d.Exec(`INSERT INTO documents (id, user_id) VALUES ('d1', ?)`, LocalUserID); err != nil {
+		t.Fatalf("insert document: %v", err)
+	}
+	if _, err := d.Exec(
+		`INSERT INTO suggestions (doc_id, from_pos, to_pos, original, replacement, explanation, type)
+		 VALUES ('d1', 0, 4, 'teh', '', 'voice flag', 'voice')`,
+	); err != nil {
+		t.Fatalf("insert voice suggestion: %v", err)
+	}
+
+	// An invalid type is rejected.
+	if _, err := d.Exec(
+		`INSERT INTO suggestions (doc_id, from_pos, to_pos, original, replacement, explanation, type)
+		 VALUES ('d1', 0, 4, 'teh', 'the', 'x', 'nonsense')`,
+	); err == nil {
+		t.Error("expected CHECK constraint to reject invalid suggestion type")
+	}
+
+	// Cascade delete removes child suggestions (foreign keys enabled).
+	if _, err := d.Exec(`DELETE FROM documents WHERE id = 'd1'`); err != nil {
+		t.Fatalf("delete document: %v", err)
+	}
+	var n int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM suggestions WHERE doc_id = 'd1'`).Scan(&n); err != nil {
+		t.Fatal(err)
+	}
+	if n != 0 {
+		t.Errorf("expected cascade delete, got %d orphan suggestions", n)
+	}
+	d.Close()
+
+	// Re-opening is idempotent: migrations and seed don't double-apply or error.
+	d2, err := Open(path)
+	if err != nil {
+		t.Fatalf("second open: %v", err)
+	}
+	defer d2.Close()
+
+	var users int
+	if err := d2.QueryRow(`SELECT COUNT(*) FROM users WHERE id = ?`, LocalUserID).Scan(&users); err != nil {
+		t.Fatal(err)
+	}
+	if users != 1 {
+		t.Errorf("expected exactly 1 local user after reopen, got %d", users)
+	}
+}