tests: add base_null.nit

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/tests/base_null.nit b/tests/base_null.nit
new file mode 100644 (file)
index 0000000..78f362a
--- /dev/null
+++ b/tests/base_null.nit
@@ -0,0 +1,42 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import kernel
+
+class A
+       redef fun output do 10.output
+end
+
+var a: Object = new A
+var na: nullable Object = new A
+var nn: nullable Object = null
+
+(null == a).output
+(null == na).output
+(null == nn).output
+(null == null).output
+
+'\n'.output
+
+null.is_same_instance(a).output
+null.is_same_instance(na).output
+null.is_same_instance(nn).output
+null.is_same_instance(null).output
+
+'\n'.output
+
+(null != a).output
+(null != na).output
+(null != nn).output
+(null != null).output

diff --git a/tests/sav/base_null.res b/tests/sav/base_null.res
new file mode 100644 (file)
index 0000000..80acf2a
--- /dev/null
+++ b/tests/sav/base_null.res
@@ -0,0 +1,16 @@
+base_null.nit:28,2--13: Warning: expression is not null, since it is a `null`.
+base_null.nit:42,2--13: Warning: expression is not null, since it is a `null`.
+false
+false
+true
+true
+
+false
+false
+true
+true
+
+true
+true
+false
+false