go-tupleconv: change the datetime conversion logic, improve tests #105

	---
	name: Tests

	on: [push, pull_request]

	jobs:
	tests:
	if: (github.event_name == 'push') \|\|
	(github.event_name == 'pull_request' &&
	github.event.pull_request.head.repo.full_name != github.repository)

	runs-on: ubuntu-22.04

	steps:
	- uses: actions/checkout@v3

	- name: Setup tarantool
	uses: tarantool/setup-tarantool@v2
	with:
	tarantool-version: 2.x-latest

	- name: Setup Go
	uses: actions/setup-go@v4
	with:
	go-version: '1.19'

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v3
	continue-on-error: true
	with:
	# The first run is for GitHub Actions error format.
	args: --config=golangci-lint.yml

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v3
	with:
	# The second run is for human-readable error format with a file name
	# and a line number.
	args: --out-${NO_FUTURE}format colored-line-number --config=golangci-lint.yml

	- name: Unit tests
	run: \|
	go test -race ./... -covermode=atomic -coverprofile=coverage.out

	- name: Print coverage and send to coveralls
	env:
	COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	go get golang.org/x/tools/cmd/cover
	go tool cover -func=coverage.out
	go get github.com/mattn/goveralls
	go install github.com/mattn/goveralls
	goveralls -coverprofile=coverage.out -service=github

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