Added basic `scrapy check` tests

tests/test_command_check.py

@@ -0,0 +1,96 @@
+from os.path import join, abspath
+
+from tests.test_commands import CommandTest
+
+
+class CheckCommandTest(CommandTest):
+
+    command = 'check'
+
+    def setUp(self):
+        super(CheckCommandTest, self).setUp()
+        self.spider_name = 'check_spider'
+        self.spider = abspath(join(self.proj_mod_path, 'spiders', 'checkspider.py'))
+
+    def _write_contract(self, contracts, parse_def):
+        with open(self.spider, 'w') as file:
+            file.write(f"""
+import scrapy
+
+class CheckSpider(scrapy.Spider):
+    name = '{self.spider_name}'
+    start_urls = ['http://example.com']
+
+    def parse(self, response, **cb_kwargs):
+        \"\"\"
+        @url http://www.amazon.com/s?field-keywords=selfish+gene
+        {contracts}
+        \"\"\"
+        {parse_def}
+            """)
+
+    def _test_contract(self, contracts='', parse_def='pass'):
+        self._write_contract(contracts, parse_def)
+        p, out, err = self.proc('check')
+        self.assertIn('OK', err)
+        self.assertEqual(p.returncode, 0)
+
+    def test_check_returns_requests_contract(self):
+        contracts = """
+        @returns requests 1
+        """
+        parse_def = """
+        yield scrapy.Request(url='http://next-url.com')
+        """
+        self._test_contract(contracts, parse_def)
+
+    def test_check_returns_items_contract(self):
+        contracts = """
+        @returns items 1
+        """
+        parse_def = """
+        yield {'key1': 'val1', 'key2': 'val2'}
+        """
+        self._test_contract(contracts, parse_def)
+
+    def test_check_cb_kwargs_contract(self):
+        contracts = """
+        @cb_kwargs {"arg1": "val1", "arg2": "val2"}
+        """
+        parse_def = """
+        if len(cb_kwargs.items()) == 0:
+            raise Exception("Callback args not set")
+        """
+        self._test_contract(contracts, parse_def)
+
+    def test_check_scrapes_contract(self):
+        contracts = """
+        @scrapes key1 key2
+        """
+        parse_def = """
+        yield {'key1': 'val1', 'key2': 'val2'}
+        """
+        self._test_contract(contracts, parse_def)
+
+    def test_check_all_default_contracts(self):
+        contracts = """
+        @returns items 1
+        @returns requests 1
+        @scrapes key1 key2
+        @cb_kwargs {"arg1": "val1", "arg2": "val2"}
+        """
+        parse_def = """
+        yield {'key1': 'val1', 'key2': 'val2'}
+        yield scrapy.Request(url='http://next-url.com')
+        if len(cb_kwargs.items()) == 0:
+            raise Exception("Callback args not set")
+        """
+        self._test_contract(contracts, parse_def)
+
+    def test_SCRAPY_CHECK_set(self):
+        parse_def = """
+        import os
+        if not os.environ.get('SCRAPY_CHECK'):
+            raise Exception('SCRAPY_CHECK not set')
+        """
+        self._test_contract(parse_def=parse_def)