diff --git a/.travis.yml b/.travis.yml
index dbb3174..7460084 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
 language: python
 install:
   - pip install -r requirements.txt
-script: pytest -v test.py
+script: pytest -v
diff --git a/requirements.txt b/requirements.txt
index 763f986..271ebcd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
-svgwrite
 numpy>=1.18.1
-PyYAML>=4.2b1
+portolan
+pyyaml>=4.2b1
+svgwrite
 urllib3>=1.25.6
diff --git a/roentgen/constructor.py b/roentgen/constructor.py
index 01d8fb9..3a0acbe 100644
--- a/roentgen/constructor.py
+++ b/roentgen/constructor.py
@@ -1,8 +1,7 @@
 import numpy as np
 
-from hashlib import sha256
-
 from datetime import datetime
+from hashlib import sha256
 from typing import Any, Dict, List, Optional, Set
 
 from roentgen import ui
@@ -30,6 +29,11 @@ class Node:
         self.layer = 0
         self.is_for_node = is_for_node
 
+    def get_tag(self, key: str):
+        if key in self.tags:
+            return self.tags[key]
+        return None
+
 
 class Way:
     """
@@ -95,13 +99,12 @@ def get_user_color(text: str, seed: str):
     return "#" + "0" * (6 - len(h)) + h
 
 
-def get_time_color(time):
+def get_time_color(time: datetime):
     """
     Generate color based on time.
     """
     if not time:
         return "#000000"
-    time = datetime.strptime(time, "%Y-%m-%dT%H:%M:%SZ")
     delta = (datetime.now() - time).total_seconds()
     time_color = hex(0xFF - min(0xFF, int(delta / 500000.)))[2:]
     i_time_color = hex(min(0xFF, int(delta / 500000.)))[2:]
diff --git a/roentgen/direction.py b/roentgen/direction.py
index c5dd8f3..3a709aa 100644
--- a/roentgen/direction.py
+++ b/roentgen/direction.py
@@ -3,42 +3,51 @@ Direction tag support.
 
 Author: Sergey Vartanov (me@enzet.ru).
 """
-import math
+from typing import Iterator, List, Optional, Union
+
 import numpy as np
-
-from typing import Dict, List, Optional, Iterator
-
-
-DIRECTIONS: Dict[str, np.array] = {
-    "N": np.array((0, -1)),
-    "E": np.array((1, 0)),
-    "W": np.array((-1, 0)),
-    "S": np.array((0, 1)),
-}
+from portolan import middle
 
 
 def parse_vector(text: str) -> np.array:
     """
-    Parse vector from text representation: letters N, E, W, S or 360-degree
-    notation.  E.g. NW, 270.
+    Parse vector from text representation: compass points or 360-degree
+    notation.  E.g. "NW", "270".
 
     :param text: vector text representation
     :return: parsed normalized vector
     """
+    def degree_to_radian(degree: float):
+        """ Convert value in degrees to radians. """
+        return degree / 180 * np.pi - np.pi / 2
+
     try:
-        degree: float = float(text) / 180 * math.pi - math.pi / 2
-        return np.array((math.cos(degree), math.sin(degree)))
-    except ValueError as e:
-        vector: np.array = np.array((0, 0))
-        for char in text:  # type: str
-            if char not in DIRECTIONS:
-                return None
-            vector += DIRECTIONS[char]
-        return vector / np.linalg.norm(vector)
+        radians: float = degree_to_radian(float(text))
+        return np.array((np.cos(radians), np.sin(radians)))
+    except ValueError:
+        radians: float = degree_to_radian(middle(text))
+        return np.array((np.cos(radians), np.sin(radians)))
+
+
+def rotation_matrix(angle):
+    """
+    Get a matrix to rotate 2D vector by the angle.
+
+    :param angle: angle in radians
+    """
+    return np.array([
+        [np.cos(angle), np.sin(angle)],
+        [-np.sin(angle), np.cos(angle)]])
 
 
 class Sector:
+    """
+    Sector described by two vectors.
+    """
     def __init__(self, text: str):
+        """
+        :param text: sector text representation.  E.g. "70-210", "N-NW"
+        """
         self.start: Optional[np.array]
         self.end: Optional[np.array]
 
@@ -47,16 +56,23 @@ class Sector:
             self.start = parse_vector(parts[0])
             self.end = parse_vector(parts[1])
         else:
-            self.start = parse_vector(text)
-            self.end = None
+            vector = parse_vector(text)
+            angle = np.pi / 12
+            self.start = np.dot(rotation_matrix(angle), vector)
+            self.end = np.dot(rotation_matrix(-angle), vector)
 
-    def draw(self, center: np.array, radius: float) -> List:
+    def draw(self, center: np.array, radius: float) \
+            -> Optional[List[Union[float, str, np.array]]]:
         """
-        Construct SVG "d" for arc element.
+        Construct SVG path commands for arc element.
 
-        :param center: arc center
+        :param center: arc center point
         :param radius: arc radius
+        :return: SVG path commands
         """
+        if self.start is None or self.end is None:
+            return None
+
         start: np.array = center + radius * self.end
         end: np.array = center + radius * self.start
 
@@ -79,5 +95,14 @@ class DirectionSet:
     def __str__(self):
         return ", ".join(map(str, self.sectors))
 
-    def draw(self, center: np.array, radius: float) -> Iterator[str]:
-        return map(lambda x: x.draw(center, radius), self.sectors)
+    def draw(self, center: np.array, radius: float) -> Iterator[List]:
+        """
+        Construct SVG "d" for arc elements.
+
+        :param center: center point of all arcs
+        :param radius: radius of all arcs
+        :return: list of "d" values
+        """
+        return filter(
+            lambda x: x is not None,
+            map(lambda x: x.draw(center, radius), self.sectors))
diff --git a/roentgen/flinger.py b/roentgen/flinger.py
index c9d8124..7dbcac6 100644
--- a/roentgen/flinger.py
+++ b/roentgen/flinger.py
@@ -5,6 +5,8 @@ import math
 import numpy as np
 from typing import Optional
 
+from roentgen.util import MinMax
+
 
 def get_ratio(maximum, minimum, ratio: float = 1):
     return (maximum[0] - minimum[0]) * ratio / (maximum[1] - minimum[1])
diff --git a/roentgen/grid.py b/roentgen/grid.py
index b230e62..d1901fc 100644
--- a/roentgen/grid.py
+++ b/roentgen/grid.py
@@ -1,10 +1,10 @@
 """
+Icon grid drawing.
+
 Author: Sergey Vartanov (me@enzet.ru).
 """
 import numpy as np
-import os
-import random
-import svgwrite
+from svgwrite import Drawing
 import yaml
 
 from roentgen.extract_icon import Icon, IconExtractor
@@ -12,32 +12,21 @@ from roentgen.extract_icon import Icon, IconExtractor
 from typing import List
 
 
-def draw_grid():
+def draw_grid(step: float = 24, columns: int = 16):
+    """
+    Draw all possible icon combinations in grid.
+
+    :param step: horizontal and vertical distance between icons
+    :param columns: the number of columns in grid
+    """
     tags_file_name = "data/tags.yml"
 
     scheme = yaml.load(open(tags_file_name), Loader=yaml.FullLoader)
 
     icons_file_name = "icons/icons.svg"
     icon_grid_file_name = "icon_grid.svg"
-    icon_colors_file_name = "data/icon_colors"
-
-    icon_colors = [("FFFFFF", "444444")]
-
-    if os.path.isfile(icon_colors_file_name):
-        icon_colors_file = open(icon_colors_file_name)
-        for line in icon_colors_file.read().split("\n"):
-            background_color = \
-                hex(int(line[0:3]))[2:] + hex(int(line[3:6]))[2:] + \
-                hex(int(line[6:9]))[2:]
-            foreground_color = \
-                hex(int(line[10:13]))[2:] + hex(int(line[13:16]))[2:] + \
-                hex(int(line[16:19]))[2:]
-            icon_colors.append((background_color, foreground_color))
-
-    step: float = 24
-
-    width: float = 24 * 16
 
+    width: float = step * columns
     point: np.array = np.array((step / 2, step / 2))
 
     to_draw = []
@@ -89,20 +78,20 @@ def draw_grid():
             icons.append(icon_set)
             number += 1
 
-    height = int(number / (width / step) + 1) * step
+    height: int = int(int(number / (width / step) + 1) * step)
 
-    svg = svgwrite.Drawing(icon_grid_file_name, (width, height))
+    svg: Drawing = Drawing(icon_grid_file_name, (width, height))
 
     svg.add(svg.rect((0, 0), (width, height), fill="#FFFFFF"))
 
     for icon in icons:
-        background_color, foreground_color = random.choice(icon_colors)
+        background_color, foreground_color = "#FFFFFF", "#444444"
         svg.add(svg.rect(
             point - np.array((-10, -10)), (20, 20),
-            fill=f"#{background_color}"))
+            fill=background_color))
         for i in icon:  # type: Icon
             path = i.get_path(svg, point)
-            path.update({"fill": f"#{foreground_color}"})
+            path.update({"fill": foreground_color})
             svg.add(path)
         point += np.array((step, 0))
         if point[0] > width - 8:
@@ -112,4 +101,5 @@ def draw_grid():
 
     print(f"Icons: {number}.")
 
-    svg.write(open(icon_grid_file_name, "w"))
+    with open(icon_grid_file_name, "w") as output_file:
+        svg.write(output_file)
diff --git a/roentgen/mapper.py b/roentgen/mapper.py
index 4cadcbb..49c7e58 100644
--- a/roentgen/mapper.py
+++ b/roentgen/mapper.py
@@ -15,6 +15,7 @@ from svgwrite.text import Text
 from typing import Dict, List
 
 from roentgen import ui
+from roentgen.address import get_address
 from roentgen.constructor import Constructor, get_path, Node, Way
 from roentgen.flinger import GeoFlinger, Geo
 from roentgen.grid import draw_grid
@@ -39,7 +40,7 @@ class Painter:
     """
     def __init__(
             self, show_missing_tags: bool, overlap: int, draw_nodes: bool,
-            mode: str, draw_captions: bool, map_: Map, flinger: GeoFlinger,
+            mode: str, draw_captions: str, map_: Map, flinger: GeoFlinger,
             svg: svgwrite.Drawing, icon_extractor: IconExtractor,
             scheme: Scheme):
 
@@ -47,7 +48,7 @@ class Painter:
         self.overlap: int = overlap
         self.draw_nodes: bool = draw_nodes
         self.mode: str = mode
-        self.draw_captions = draw_captions
+        self.draw_captions: str = draw_captions
 
         self.map_: Map = map_
         self.flinger: GeoFlinger = flinger
@@ -150,7 +151,6 @@ class Painter:
         Construct labels for not processed tags.
         """
         texts = []
-        address: List[str] = []
         name = None
         alt_name = None
         if "name" in tags:
@@ -179,24 +179,9 @@ class Painter:
             else:
                 alt_name = ""
             alt_name += "бывш. " + tags["old_name"]
-        if "addr:postcode" in tags and self.draw_captions != "main":
-            address.append(tags["addr:postcode"])
-            tags.pop("addr:postcode", None)
-        if "addr:country" in tags and self.draw_captions != "main":
-            address.append(tags["addr:country"])
-            tags.pop("addr:country", None)
-        if "addr:city" in tags and self.draw_captions != "main":
-            address.append(tags["addr:city"])
-            tags.pop("addr:city", None)
-        if "addr:street" in tags and self.draw_captions != "main":
-            street = tags["addr:street"]
-            if street.startswith("улица "):
-                street = "ул. " + street[len("улица "):]
-            address.append(street)
-            tags.pop("addr:street", None)
-        if "addr:housenumber" in tags:
-            address.append(tags["addr:housenumber"])
-            tags.pop("addr:housenumber", None)
+
+        address = get_address(tags, self.draw_captions)
+
         if name:
             texts.append({"text": name, "fill": "#000000"})
         if alt_name:
@@ -338,8 +323,7 @@ class Painter:
         # Trees
 
         for node in nodes:
-            if not("natural" in node.tags and
-                   node.tags["natural"] == "tree" and
+            if not(node.get_tag("natural") == "tree" and
                    "diameter_crown" in node.tags):
                 continue
             self.svg.add(Circle(
@@ -348,23 +332,27 @@ class Painter:
 
         # Directions
 
-        for node in nodes:
-            if not ("tourism" in node.tags and
-                    node.tags["tourism"] == "viewpoint" and
-                    "direction" in node.tags):
+        for node in nodes:  # type: Node
+            direction = None
+            if node.get_tag("tourism") == "viewpoint":
+                direction = node.get_tag("direction")
+            if node.get_tag("man_made") == "surveillance":
+                direction = node.get_tag("camera:direction")
+
+            if not direction:
                 continue
 
-            DIRECTION_RADIUS: int = 50
+            DIRECTION_RADIUS: int = 25
             DIRECTION_COLOR: str = self.scheme.get_color("direction_color")
 
-            for path in DirectionSet(node.tags["direction"])\
+            for path in DirectionSet(direction)\
                     .draw(node.point, DIRECTION_RADIUS):
                 gradient = self.svg.defs.add(self.svg.radialGradient(
                     center=node.point, r=DIRECTION_RADIUS,
                     gradientUnits="userSpaceOnUse"))
                 gradient\
                     .add_stop_color(0, DIRECTION_COLOR, opacity=0)\
-                    .add_stop_color(1, DIRECTION_COLOR, opacity=0.7)
+                    .add_stop_color(1, DIRECTION_COLOR, opacity=0.4)
                 self.svg.add(self.svg.path(
                     d=["M", node.point] + path + ["L", node.point, "Z"],
                     fill=gradient.get_paint_server()))
@@ -372,12 +360,14 @@ class Painter:
         # All other nodes
 
         nodes = sorted(nodes, key=lambda x: x.layer)
-        for node in nodes:  # type: Node
+        for index, node in enumerate(nodes):  # type: int, Node
             if "natural" in node.tags and \
                    node.tags["natural"] == "tree" and \
                    "diameter_crown" in node.tags:
                 continue
+            ui.progress_bar(index, len(nodes), step=10)
             self.draw_shapes(node, points)
+        ui.progress_bar(-1, len(nodes), step=10)
 
         if self.draw_captions == "no":
             return
@@ -405,7 +395,7 @@ class Painter:
         point = np.array(list(map(lambda x: int(x), point)))
         title: str = "\n".join(map(lambda x: x + ": " + tags[x], tags))
 
-        path = icon.get_path(self.svg, point)
+        path: svgwrite.path.Path = icon.get_path(self.svg, point)
         path.update({"fill": fill})
         path.set_desc(title=title)
         self.svg.add(path)
@@ -518,15 +508,14 @@ def main():
     min1 = Geo(boundary_box[1], boundary_box[0])
     max1 = Geo(boundary_box[3], boundary_box[2])
 
-    authors = {}
     missing_tags = {}
     points = []
 
-    scheme = Scheme(TAGS_FILE_NAME, COLORS_FILE_NAME)
+    scheme: Scheme = Scheme(TAGS_FILE_NAME, COLORS_FILE_NAME)
 
-    flinger = GeoFlinger(min1, max1, [0, 0], [w, h])
+    flinger: GeoFlinger = GeoFlinger(min1, max1, [0, 0], [w, h])
 
-    icon_extractor = IconExtractor(ICONS_FILE_NAME)
+    icon_extractor: IconExtractor = IconExtractor(ICONS_FILE_NAME)
 
     def check_level(x):
         """ Draw objects on all levels. """
@@ -544,14 +533,14 @@ def main():
                 """ Draw objects on the specified level. """
                 return not check_level_number(x, float(options.level))
 
-    constructor = Constructor(
+    constructor: Constructor = Constructor(
         check_level, options.mode, options.seed, map_, flinger, scheme)
     if options.draw_ways:
         constructor.construct_ways()
         constructor.construct_relations()
     constructor.construct_nodes()
 
-    painter = Painter(
+    painter: Painter = Painter(
         show_missing_tags=options.show_missing_tags, overlap=options.overlap,
         draw_nodes=options.draw_nodes, mode=options.mode,
         draw_captions=options.draw_captions,
@@ -569,57 +558,11 @@ def main():
             (w - flinger.space[0], 0), (flinger.space[0], h), fill="#FFFFFF"))
 
     if options.show_index:
-        print(min1.lon, max1.lon)
-        print(min1.lat, max1.lat)
-
-        lon_step = 0.001
-        lat_step = 0.001
-
-        matrix = []
-
-        lat_number = int((max1.lat - min1.lat) / lat_step) + 1
-        lon_number = int((max1.lon - min1.lon) / lon_step) + 1
-
-        for i in range(lat_number):
-            row = []
-            for j in range(lon_number):
-                row.append(0)
-            matrix.append(row)
-
-        for node_id in map_.node_map:
-            node = map_.node_map[node_id]
-            i = int((node.lat - min1.lat) / lat_step)
-            j = int((node.lon - min1.lon) / lon_step)
-            if (0 <= i < lat_number) and (0 <= j < lon_number):
-                matrix[i][j] += 1
-                if "tags" in node:
-                    matrix[i][j] += len(node.tags)
-
-        for way_id in map_.way_map:
-            way = map_.way_map[way_id]
-            if "tags" in way:
-                for node_id in way.nodes:
-                    node = map_.node_map[node_id]
-                    i = int((node.lat - min1.lat) / lat_step)
-                    j = int((node.lon - min1.lon) / lon_step)
-                    if (0 <= i < lat_number) and (0 <= j < lon_number):
-                        matrix[i][j] += len(way.tags) / float(
-                            len(way.nodes))
-
-        for i in range(lat_number):
-            for j in range(lon_number):
-                t1 = flinger.fling(Geo(
-                    min1.lat + i * lat_step, min1.lon + j * lon_step))
-                t2 = flinger.fling(Geo(
-                    min1.lat + (i + 1) * lat_step,
-                    min1.lon + (j + 1) * lon_step))
-                svg.add(Text(
-                    str(int(matrix[i][j])),
-                    (((t1 + t2) * 0.5)[0], ((t1 + t2) * 0.5)[1] + 40),
-                    font_size=80, fill="440000",
-                    opacity=0.1, align="center"))
+        draw_index(flinger, map_, max1, min1, svg)
 
+    print("Writing output SVG...")
     svg.write(open(options.output_file_name, "w"))
+    print("Done")
 
     top_missing_tags = \
         sorted(missing_tags.keys(), key=lambda x: -missing_tags[x])
@@ -629,6 +572,47 @@ def main():
             f'- {{tag: "{tag}", count: {missing_tags[tag]}}}\n')
     missing_tags_file.close()
 
-    top_authors = sorted(authors.keys(), key=lambda x: -authors[x])
-    for author in top_authors:
-        print(f"{author}: {authors[author]}")
+
+def draw_index(flinger, map_, max1, min1, svg):
+    print(min1.lon, max1.lon)
+    print(min1.lat, max1.lat)
+    lon_step = 0.001
+    lat_step = 0.001
+    matrix = []
+    lat_number = int((max1.lat - min1.lat) / lat_step) + 1
+    lon_number = int((max1.lon - min1.lon) / lon_step) + 1
+    for i in range(lat_number):
+        row = []
+        for j in range(lon_number):
+            row.append(0)
+        matrix.append(row)
+    for node_id in map_.node_map:  # type: int
+        node = map_.node_map[node_id]
+        i = int((node.lat - min1.lat) / lat_step)
+        j = int((node.lon - min1.lon) / lon_step)
+        if (0 <= i < lat_number) and (0 <= j < lon_number):
+            matrix[i][j] += 1
+            if "tags" in node:
+                matrix[i][j] += len(node.tags)
+    for way_id in map_.way_map:  # type: int
+        way = map_.way_map[way_id]
+        if "tags" in way:
+            for node_id in way.nodes:
+                node = map_.node_map[node_id]
+                i = int((node.lat - min1.lat) / lat_step)
+                j = int((node.lon - min1.lon) / lon_step)
+                if (0 <= i < lat_number) and (0 <= j < lon_number):
+                    matrix[i][j] += len(way.tags) / float(
+                        len(way.nodes))
+    for i in range(lat_number):
+        for j in range(lon_number):
+            t1 = flinger.fling(Geo(
+                min1.lat + i * lat_step, min1.lon + j * lon_step))
+            t2 = flinger.fling(Geo(
+                min1.lat + (i + 1) * lat_step,
+                min1.lon + (j + 1) * lon_step))
+            svg.add(Text(
+                str(int(matrix[i][j])),
+                (((t1 + t2) * 0.5)[0], ((t1 + t2) * 0.5)[1] + 40),
+                font_size=80, fill="440000",
+                opacity=0.1, align="center"))
diff --git a/roentgen/osm_reader.py b/roentgen/osm_reader.py
index 89509c3..5044e9e 100644
--- a/roentgen/osm_reader.py
+++ b/roentgen/osm_reader.py
@@ -3,6 +3,7 @@ Reading OpenStreetMap data from XML file.
 
 Author: Sergey Vartanov
 """
+from datetime import datetime
 from typing import Dict, List, Optional
 
 from roentgen import ui
@@ -61,7 +62,7 @@ class OSMWay:
         self.visible: Optional[str] = None
         self.changeset: Optional[str] = None
         self.user: Optional[str] = None
-        self.timestamp: Optional[str] = None
+        self.timestamp: Optional[datetime] = None
         self.uid: Optional[str] = None
 
     def parse_from_xml(self, text: str, is_full: bool = False) -> "OSMWay":
@@ -76,7 +77,8 @@ class OSMWay:
         if is_full:
             self.visible = get_value("visible", text)
             self.changeset = get_value("changeset", text)
-            self.timestamp = get_value("timestamp", text)
+            self.timestamp = datetime.strptime(
+                get_value("timestamp", text), "%Y-%m-%dT%H:%M:%SZ")
             self.user = get_value("user", text)
             self.uid = get_value("uid", text)
 
@@ -190,8 +192,7 @@ class OSMReader:
                 if not parse_nodes:
                     if parse_ways or parse_relations:
                         continue
-                    else:
-                        break
+                    break
                 if line[-3] == "/":
                     node: OSMNode = OSMNode().parse_from_xml(line[7:-3], full)
                     self.map_.node_map[node.id_] = node
@@ -206,8 +207,7 @@ class OSMReader:
                 if not parse_ways:
                     if parse_relations:
                         continue
-                    else:
-                        break
+                    break
                 if line[-3] == '/':
                     way = OSMWay().parse_from_xml(line[6:-3], full)
                     self.map_.way_map[way.id_] = way
diff --git a/roentgen/ui.py b/roentgen/ui.py
index 210000d..d28964b 100644
--- a/roentgen/ui.py
+++ b/roentgen/ui.py
@@ -39,7 +39,8 @@ def parse_options(args):
         "-s", "--size",
         metavar="<width>,<height>",
         help="output SVG file size in pixels",
-        dest="size")
+        dest="size",
+        required=True)
     parser.add_argument(
         "-nn", "--no-draw-nodes",
         dest="draw_nodes",
diff --git a/roentgen/util.py b/roentgen/util.py
index 932ab9e..2e834f3 100644
--- a/roentgen/util.py
+++ b/roentgen/util.py
@@ -5,4 +5,4 @@ class MinMax:
 
     def add(self, value):
         self.min_ = value if not self.min_ or value < self.min_ else self.min_
-        self.max_ = value if not self.max_ or value > self.max_ else self.max_
\ No newline at end of file
+        self.max_ = value if not self.max_ or value > self.max_ else self.max_
diff --git a/test/test_direction.py b/test/test_direction.py
new file mode 100644
index 0000000..00c5a19
--- /dev/null
+++ b/test/test_direction.py
@@ -0,0 +1,22 @@
+"""
+Test direction processing.
+
+Author: Sergey Vartanov (me@enzet.ru).
+"""
+import numpy as np
+
+from roentgen.direction import parse_vector
+
+
+def test_compass_points_1():
+    assert np.allclose(parse_vector("N"), np.array([0, -1]))
+
+
+def test_compass_points_2():
+    root: np.float64 = -np.sqrt(2) / 2
+    assert np.allclose(parse_vector("NW"), np.array([root, root]))
+
+
+def test_compass_points_3():
+    assert np.allclose(
+        parse_vector("SSW"), np.array([-0.38268343, 0.92387953]))
diff --git a/test.py b/test/test_icons.py
similarity index 85%
rename from test.py
rename to test/test_icons.py
index 4bc5542..8b97a6a 100644
--- a/test.py
+++ b/test/test_icons.py
@@ -2,10 +2,6 @@
 Author: Sergey Vartanov (me@enzet.ru).
 """
 
-import os
-import random
-import yaml
-
 from roentgen.flinger import map_
 from roentgen.grid import draw_grid
 
diff --git a/test_main.py b/test_main.py
new file mode 100644
index 0000000..3a7c3c0
--- /dev/null
+++ b/test_main.py
@@ -0,0 +1,3 @@
+def test_main():
+    assert True
+