put snappy in 'generator' extra dep build and use for generator builds

setup.py

@@ -576,6 +576,7 @@ setup(
     extras_require={
         "test": ["pytest>=4.4", "pytest-cov", "pytest-xdist"],
         "lint": ["flake8==3.7.7", "mypy==0.750"],
+        "generator": ["python-snappy==0.5.4"],
     },
     install_requires=[
         "eth-utils>=1.3.0,<2",
@@ -587,6 +588,5 @@ setup(
         "remerkleable==0.1.18",
         "ruamel.yaml==0.16.5",
         "lru-dict==1.1.6",
-        "python-snappy==0.5.4",
     ]
 )

tests/generators/README.md

@@ -79,7 +79,7 @@ It's recommended to extend the base-generator.
 Create a `requirements.txt` in the root of your generator directory:
 ```
 pytest>=4.4
-../../../
+../../../[generator]
 ```
 
 The config helper and pyspec is optional, but preferred. We encourage generators to derive tests from the spec itself in order to prevent code duplication and outdated tests.

tests/generators/bls/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/epoch_processing/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/finality/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/forks/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/genesis/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/operations/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/rewards/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/shuffling/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/ssz_generic/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]

tests/generators/ssz_static/requirements.txt

@@ -1,2 +1,2 @@
 pytest>=4.4
-../../../
+../../../[generator]