Finish writing tests

[iquidus]

Current test coverage is too small

go run build/ci.go test
>>> /usr/local/go/bin/go test -timeout=20m -tags=ckzg -p 1 ./...
ok  	github.com/iquidus/blockspider/cache	(cached)
?   	github.com/iquidus/blockspider/cmd/blockspiderd	[no test files]
?   	github.com/iquidus/blockspider/cmd/consumer	[no test files]
?   	github.com/iquidus/blockspider/cmd/reorgd	[no test files]
?   	github.com/iquidus/blockspider/common	[no test files]
?   	github.com/iquidus/blockspider/crawler	[no test files]
?   	github.com/iquidus/blockspider/internal/build	[no test files]
?   	github.com/iquidus/blockspider/kafka	[no test files]
?   	github.com/iquidus/blockspider/params	[no test files]
?   	github.com/iquidus/blockspider/rpc	[no test files]
?   	github.com/iquidus/blockspider/state	[no test files]
ok  	github.com/iquidus/blockspider/syncronizer	(cached)
?   	github.com/iquidus/blockspider/util	[no test files]

Finish writing tests. This will likely require some refactoring.