[test] Add algorithm and experiment to test database sharing

test/algorithms/username/shared_datasets/1.json

+{
+  "language": "python",
+  "splittable": true,
+  "groups": [
+    {
+      "name": "main",
+      "inputs": {
+        "in_data": {
+          "type": "{{ system_user.username }}/integer/1"
+        }
+      },
+      "outputs": {
+        "out_data": {
+          "type": "{{ system_user.username }}/integer/1"
+        }
+      }
+    }
+  ],
+  "uses": {
+    "lib": "{{ user.username }}/thelib/1"
+  }
+}

test/algorithms/username/shared_datasets/1.py

+###############################################################################
+#                                                                             #
+# Copyright (c) 2020 Idiap Research Institute, http://www.idiap.ch/           #
+# Contact: beat.support@idiap.ch                                              #
+#                                                                             #
+# This file is part of the beat.examples module of the BEAT platform.         #
+#                                                                             #
+# Commercial License Usage                                                    #
+# Licensees holding valid commercial BEAT licenses may use this file in       #
+# accordance with the terms contained in a written agreement between you      #
+# and Idiap. For further information contact tto@idiap.ch                     #
+#                                                                             #
+# Alternatively, this file may be used under the terms of the GNU Affero      #
+# Public License version 3 as published by the Free Software and appearing    #
+# in the file LICENSE.AGPL included in the packaging of this file.            #
+# The BEAT platform is distributed in the hope that it will be useful, but    #
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  #
+# or FITNESS FOR A PARTICULAR PURPOSE.                                        #
+#                                                                             #
+# You should have received a copy of the GNU Affero Public License along      #
+# with the BEAT platform. If not, see http://www.gnu.org/licenses/.           #
+#                                                                             #
+###############################################################################
+
+import os
+import numpy
+
+class Algorithm:
+
+    def __init__(self):
+        self.offset = 1
+
+    def setup(self, parameters):
+        with open("/databases/simple/1/datafile.txt", "rt") as shared_data:
+            value = shared_data.read()
+            self.offset = int(value)
+        return True
+
+    def process(self, inputs, outputs):
+        outputs['out_data'].write({
+          'value': numpy.int32(lib.another_sum(inputs['in_data'].data.value, self.offset)),
+          })
+
+        return True

test/experiments/username/username/single/1/single_database_sharing.json

+{
+  "analyzers": {
+    "analysis": {
+      "algorithm": "{{ user.username }}/integers_echo_analyzer/1",
+      "inputs": {
+        "in_data": "in"
+      }
+    }
+  },
+  "blocks": {
+    "echo": {
+      "algorithm": "{{ user.username }}/shared_datasets/1",
+      "inputs": {
+        "in_data": "in"
+      },
+      "outputs": {
+        "out_data": "out"
+      }
+    }
+  },
+  "datasets": {
+    "set": {
+        "database": "simple/1",
+        "protocol": "10_numbers",
+        "set": "numbers"
+    }
+  },
+  "globals": {
+    "queue": "{{ queue }}",
+    "environment": {
+      "name": "{{ environment.name }}",
+      "version": "{{ environment.version }}"
+    }
+  }
+}