Custom environment in AutotoolsToolchain (#10631)

Author: lasote

conans/test/integration/toolchains/gnu/__init__.py

@@ -0,0 +1,26 @@
+import os
+import textwrap
+
+from conans.test.utils.tools import TestClient
+from conans.util.files import load
+
+
+def test_autotools_custom_environment():
+    client = TestClient()
+    conanfile = textwrap.dedent("""
+            from conan import ConanFile
+            from conan.tools.gnu import AutotoolsToolchain
+
+            class Conan(ConanFile):
+                settings = "os"
+                def generate(self):
+                    at = AutotoolsToolchain(self)
+                    env = at.environment()
+                    env.define("FOO", "BAR")
+                    at.generate(env)
+            """)
+
+    client.save({"conanfile.py": conanfile})
+    client.run("install . -sh:os=Linux")
+    content = load(os.path.join(client.current_folder,  "conanautotoolstoolchain.sh"))
+    assert 'export FOO="BAR"' in content