Add tests for simple packages scenarios

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index 44c32641bcef1c2c5508e7a1fd6d7aebc6302efc..b7f451865a3d6651e9f75882842cd75651831e20 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -146,6 +146,10 @@ io/secure_socket_argument_test: StaticWarning
 io/stdout_bad_argument_test: StaticWarning
 package/package1_test: StaticWarning
 package/package_test: StaticWarning
+package/scenarios/packages_dir_only/packages_dir_only_test: StaticWarning
+package/scenarios/packages_file_only/packages_file_only_test: StaticWarning
+package/scenarios/both_dir_and_file/prefers_packages_file_test: StaticWarning
+package/scenarios/packages_file_in_parent/sub/packages_file_in_parent_test: StaticWarning
 typed_data_test: StaticWarning
 typed_data_view_test: StaticWarning
 javascript_compatibility_errors_test: Skip
@@ -154,6 +158,10 @@ javascript_compatibility_warnings_test: Skip
 [ $compiler == dart2analyzer ]
 package/package1_test: CompileTimeError
 package/package_test: CompileTimeError
+package/scenarios/packages_dir_only/packages_dir_only_test: CompileTimeError
+package/scenarios/packages_file_only/packages_file_only_test: CompileTimeError
+package/scenarios/both_dir_and_file/prefers_packages_file_test: CompileTimeError
+package/scenarios/packages_file_in_parent/sub/packages_file_in_parent_test: CompileTimeError
 
 [ $system == windows ]
 io/skipping_dart2js_compilations_test: Fail # Issue 19551.