add to test coverage (#243)

## Ticket

n/a

## Changes

Copies over unit tests discovered in other repositories, where the
subjects of the tests are functions made available by the template flask
application.

## Context for reviewers


## Testing

navapbc/platform-test-flask#9

---------

Co-authored-by: Lisa Chung <[email protected]>
Co-authored-by: Michael Chouinard <[email protected]>

Author: lisac

template/{{app_name}}/tests/src/util/test_datetime_util.py

@@ -1,9 +1,9 @@
-from datetime import datetime, timezone
+from datetime import date, datetime, timezone
 
 import pytest
 import pytz
 
-from src.util.datetime_util import adjust_timezone
+from src.util.datetime_util import adjust_timezone, datetime_str_to_date, utcnow
 
 
 @pytest.mark.parametrize(
@@ -50,3 +50,21 @@ def test_adjust_timezone_from_non_utc(timezone_name, expected_output):
     # in a few places that don't observe DST (the US timezones are all 1 hour closer to UTC)
 
     assert adjust_timezone(input_datetime, timezone_name).isoformat() == expected_output
+
+
+@pytest.mark.parametrize(
+    "datetime_str, expected_output",
+    [
+        ("2022-05-31T23:00:00-06:00", date(2022, 5, 31)),
+        ("2022-06-01T14:00:00+09:00", date(2022, 6, 1)),
+        ("", None),
+        (None, None),
+    ],
+)
+def test_datetime_str_to_date(datetime_str, expected_output):
+    assert datetime_str_to_date(datetime_str) == expected_output
+
+
+def test_utcnow():
+    assert utcnow().tzinfo == timezone.utc
+    assert utcnow().date() == datetime.now().date()

template/{{app_name}}/tests/src/util/test_file_util.py

@@ -0,0 +1,83 @@
+import os
+
+import pytest
+from smart_open import open as smart_open
+
+import src.util.file_util as file_util
+
+
+def create_file(root_path, file_path):
+    full_path = os.path.join(root_path, file_path)
+
+    if not file_util.is_s3_path(str(full_path)):
+        os.makedirs(os.path.dirname(full_path), exist_ok=True)
+
+    with smart_open(full_path, mode="w") as outfile:
+        outfile.write("hello")
+
+    return full_path
+
+
+@pytest.mark.parametrize(
+    "path,is_s3",
+    [
+        ("s3://bucket/folder/test.txt", True),
+        ("./relative/folder/test.txt", False),
+        ("http://example.com/test.txt", False),
+    ],
+)
+def test_is_s3_path(path, is_s3):
+    assert file_util.is_s3_path(path) is is_s3
+
+
+@pytest.mark.parametrize(
+    "path,bucket,prefix",
+    [
+        ("s3://my_bucket/my_key", "my_bucket", "my_key"),
+        ("s3://my_bucket/path/to/directory/", "my_bucket", "path/to/directory/"),
+        ("s3://my_bucket/path/to/file.txt", "my_bucket", "path/to/file.txt"),
+    ],
+)
+def test_split_s3_url(path, bucket, prefix):
+    assert file_util.split_s3_url(path) == (bucket, prefix)
+
+
+@pytest.mark.parametrize(
+    "path,bucket",
+    [
+        ("s3://bucket/folder/test.txt", "bucket"),
+        ("s3://bucket_x/folder", "bucket_x"),
+        ("s3://bucket-y/folder/", "bucket-y"),
+        ("s3://bucketz", "bucketz"),
+    ],
+)
+def test_get_s3_bucket(path, bucket):
+    assert file_util.get_s3_bucket(path) == bucket
+
+
+@pytest.mark.parametrize(
+    "path,file_key",
+    [
+        ("s3://bucket/folder/test.txt", "folder/test.txt"),
+        ("s3://bucket_x/file.csv", "file.csv"),
+        ("s3://bucket-y/folder/path/to/abc.zip", "folder/path/to/abc.zip"),
+        ("./folder/path", "/folder/path"),
+        ("sftp://folder/filename", "filename"),
+    ],
+)
+def test_get_s3_file_key(path, file_key):
+    assert file_util.get_s3_file_key(path) == file_key
+
+
+@pytest.mark.parametrize(
+    "path,file_name",
+    [
+        ("s3://bucket/folder/test.txt", "test.txt"),
+        ("s3://bucket_x/file.csv", "file.csv"),
+        ("s3://bucket-y/folder/path/to/abc.zip", "abc.zip"),
+        ("./folder/path", "path"),
+        ("sftp://filename", "filename"),
+    ],
+)
+def test_get_s3_file_name(path, file_name):
+    assert file_util.get_file_name(path) == file_name

template/{{app_name}}/tests/src/util/test_string_utils.py

@@ -0,0 +1,14 @@
+from src.util.string_utils import join_list
+
+
+def test_join_list():
+    assert join_list(None) == ""
+    assert join_list(None, ",") == ""
+    assert join_list(None, "|") == ""
+    assert join_list([]) == ""
+    assert join_list([], ",") == ""
+    assert join_list([], "|") == ""
+
+    assert join_list(["a", "b", "c"]) == "a\nb\nc"
+    assert join_list(["a", "b", "c"], ",") == "a,b,c"
+    assert join_list(["a", "b", "c"], "|") == "a|b|c"