Fix poetry version (#445)

__tests__/cache-restore.test.ts

@@ -1,6 +1,7 @@
 import * as core from '@actions/core';
 import * as cache from '@actions/cache';
 import * as exec from '@actions/exec';
+import * as io from '@actions/io';
 import {getCacheDistributor} from '../src/cache-distributions/cache-factory';
 import * as utils from './../src/utils';
 
@@ -37,6 +38,9 @@ virtualenvs.path = "{cache-dir}/virtualenvs"  # /Users/patrick/Library/Caches/py
   // exec spy
   let getExecOutputSpy: jest.SpyInstance;
 
+  // io spy
+  let whichSpy: jest.SpyInstance;
+
   beforeEach(() => {
     process.env['RUNNER_OS'] = process.env['RUNNER_OS'] ?? 'linux';
 
@@ -77,6 +81,8 @@ virtualenvs.path = "{cache-dir}/virtualenvs"  # /Users/patrick/Library/Caches/py
       }
     );
 
+    whichSpy = jest.spyOn(io, 'which');
+    whichSpy.mockImplementation(() => '/path/to/python');
     getLinuxOSReleaseInfoSpy = jest.spyOn(utils, 'getLinuxOSReleaseInfo');
   });
 

__tests__/data/pyproject.toml

@@ -0,0 +1,15 @@
+[tool.poetry]
+name = "testactiontasks"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <you@example.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+flake8 = "^4.0.1"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"