test(05-04): add failing tests for attach File, Thumb, and bucket

- ThumbFilename/PartitionDirectory/File.Thumb behavior tests
- OpenBucket fail-loud and memblob tests
- Migrate empty plugin list must create system_files

lagoon/migrations_test.go

@@ -137,6 +137,20 @@ func (p migPlugin) Register(*backpack.App) error        { return nil }
 func (p migPlugin) Boot(*backpack.App) error            { return nil }
 func (p migPlugin) Migrations() []*gormigrate.Migration { return p.migrations }
 
+func TestMigrateRunsSystemFilesFirst(t *testing.T) {
+	db, _ := dedicatedDB(t, "lagoon_attach_first")
+	gdb, err := Use(t.Context(), db)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := Migrate(gdb, nil); err != nil {
+		t.Fatal(err)
+	}
+	if !gdb.Migrator().HasTable("system_files") {
+		t.Fatal("system_files must exist after Migrate with an empty plugin list")
+	}
+}
+
 func TestTwoPluginMigrationSetsIsolated(t *testing.T) {
 	db, _ := dedicatedDB(t, "lagoon_mig_iso")
 	gdb, err := Use(t.Context(), db)