Use the root directory for the tox project (where the configuration f…

…ile is found) to install editable requirements (#151)

tox.ini

@@ -15,28 +15,28 @@ commands = /bin/bash -c '{envpython} -m pytest -v {posargs} tests/unit'
 passenv = DBT_INVOCATION_ENV
 deps =
    -r{toxinidir}/requirements-dev.txt
-   -e.
+   -r{toxinidir}/requirements-editable.txt
 
 [testenv:integration-mysql-8.0]
 basepython = python3.9
 commands = {envpython} -m pytest -v --profile mysql {posargs} tests/functional
 passenv = DBT_INVOCATION_ENV DBT_MYSQL_SERVER_NAME DBT_MYSQL_80_PORT
 deps =
    -r{toxinidir}/requirements-dev.txt
-   -e.
+   -r{toxinidir}/requirements-editable.txt
 
 [testenv:integration-mysql-5.7]
 basepython = python3.9
 commands = {envpython} -m pytest -v --profile mysql5 {posargs} tests/functional
 passenv = DBT_INVOCATION_ENV DBT_MYSQL_SERVER_NAME DBT_MYSQL_57_PORT
 deps =
    -r{toxinidir}/requirements-dev.txt
-   -e.
+   -r{toxinidir}/requirements-editable.txt
 
 [testenv:integration-mariadb-10.5]
 basepython = python3.9
 commands = {envpython} -m pytest -v --profile mariadb {posargs} tests/functional
 passenv = DBT_INVOCATION_ENV DBT_MYSQL_SERVER_NAME DBT_MARIADB_105_PORT
 deps =
   -r{toxinidir}/requirements-dev.txt
-  -e.
+  -r{toxinidir}/requirements-editable.txt