[WIP] Start requests order#7

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kalessin wants to merge 3 commits intomasterfrom

start_requests_order

Commits on May 6, 2021

fix tests in order to work with recent version of scrapy
kalessin
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Commits on May 7, 2021

added next_requests() test and check default ordering of scheduling
kalessin
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Commits on Jun 8, 2021

temp commit
kalessin
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