tests: Add a test to show contracts in parallel execution

Signed-off-by: Delja <deljarry.florian@gmail.com>

Author: Delja

tests/contracts_threaded.nit

@@ -0,0 +1,52 @@
+# 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.
+
+# This test shows the verification of contracts in a parallel execution.
+
+import pthreads
+
+fun foo is
+	threaded
+	expect(contract_foo)
+do
+	print "Foo"
+	bar("Foo thread")
+end
+
+fun bar(thread_name: String)
+is
+	threaded
+	expect(contract_bar(thread_name))
+do
+	print "Bar called from {thread_name}"
+end
+
+fun contract_foo: Bool
+do
+	print("Foo contract")
+	return true
+end
+
+fun contract_bar(thread_name: String): Bool
+do
+	sys.nanosleep(3,0)
+	print("Bar contract called from {thread_name}")
+	return true
+end
+
+
+foo
+sys.nanosleep(1,0)
+bar("Main thread")
+sys.nanosleep(5,0)

tests/sav/contracts_threaded.res

@@ -0,0 +1,6 @@
+Foo contract
+Foo
+Bar contract called from Foo thread
+Bar called from Foo thread
+Bar contract called from Main thread
+Bar called from Main thread