Adding scala test notebook for better testing support

tests/notebooks/ipynb_scala/simple_scala_notebook.ipynb

@@ -0,0 +1,75 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "defined object SampleObject\n",
+       "result = 3\n"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data",
+     "source": "user"
+    },
+    {
+     "data": {
+      "text/plain": [
+       "3"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "// This is just a simple scala notebook\n",
+    "\n",
+    "object SampleObject {\n",
+    "    def calculation(x: Int, y: Int): Int = x + y\n",
+    "}\n",
+    "\n",
+    "val result = SampleObject.calculation(1, 2)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "30\n"
+     ]
+    }
+   ],
+   "source": [
+    "println(result * 10)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Apache Toree - Scala",
+   "language": "scala",
+   "name": "apache_toree_scala"
+  },
+  "language_info": {
+   "codemirror_mode": "text/x-scala",
+   "file_extension": ".scala",
+   "mimetype": "text/x-scala",
+   "name": "scala",
+   "pygments_lexer": "scala",
+   "version": "2.11.12"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

tests/notebooks/mirror/ipynb_to_percent/simple_scala_notebook.scala

@@ -0,0 +1,19 @@
+// ---
+// jupyter:
+//   kernelspec:
+//     display_name: Apache Toree - Scala
+//     language: scala
+//     name: apache_toree_scala
+// ---
+
+// %%
+// This is just a simple scala notebook
+
+object SampleObject {
+    def calculation(x: Int, y: Int): Int = x + y
+}
+
+val result = SampleObject.calculation(1, 2)
+
+// %%
+println(result * 10)

tests/notebooks/mirror/ipynb_to_script/simple_scala_notebook.scala

@@ -0,0 +1,19 @@
+// ---
+// jupyter:
+//   kernelspec:
+//     display_name: Apache Toree - Scala
+//     language: scala
+//     name: apache_toree_scala
+// ---
+
+// +
+// This is just a simple scala notebook
+
+object SampleObject {
+    def calculation(x: Int, y: Int): Int = x + y
+}
+
+val result = SampleObject.calculation(1, 2)
+// -
+
+println(result * 10)

tests/test_mirror.py

@@ -4,10 +4,12 @@
 """
 
 import os
+
 import mock
 import pytest
 from nbformat.v4.nbbase import new_notebook
 from testfixtures import compare
+
 import jupytext
 from jupytext.compare import compare_notebooks, combine_inputs_with_outputs
 from jupytext.formats import long_form_one_format
@@ -315,3 +317,13 @@ def test_ipynb_to_ts(nb_file):
 @pytest.mark.parametrize('nb_file', list_notebooks('ipynb_ts'))
 def test_ipynb_to_ts_percent(nb_file):
     assert_conversion_same_as_mirror(nb_file, 'ts:percent', 'ipynb_to_percent')
+
+
+@pytest.mark.parametrize('nb_file', list_notebooks('ipynb_scala'))
+def test_ipynb_to_scala(nb_file):
+    assert_conversion_same_as_mirror(nb_file, 'scala', 'ipynb_to_script')
+
+
+@pytest.mark.parametrize('nb_file', list_notebooks('ipynb_scala'))
+def test_ipynb_to_scala_percent(nb_file):
+    assert_conversion_same_as_mirror(nb_file, 'scala:percent', 'ipynb_to_percent')