Remove testing for shared mode

lib/spack/spack/test/cmd/install.py

@@ -592,22 +592,3 @@ def test_build_warning_output(tmpdir, mock_fetch, install_mockery, capfd):
 
         assert 'WARNING: ALL CAPITAL WARNING!' in msg
         assert 'foo.c:89: warning: some weird warning!' in msg
-
-
-@pytest.mark.test_shared_install
-def test_shared_install(
-        tmpdir, mock_packages, mock_archive, mock_fetch, config,
-        install_mockery):
-    share('activate')
-    with tmpdir.as_cwd():
-        install('--log-format=junit', '--log-file=test.xml', 'libdwarf')
-
-    files = tmpdir.listdir()
-    filename = tmpdir.join('test.xml')
-    assert filename in files
-
-    content = filename.open().read()
-    assert 'tests="2"' in content
-    assert 'failures="0"' in content
-    assert 'errors="0"' in content
-    share('deactivate')