From 72e910d02e8582ce7703a863c5936ef9f4f46e87 Mon Sep 17 00:00:00 2001
From: Dmitry Kokorin <d.kokorin@npp-crts.ru>
Date: Tue, 6 Jul 2021 18:07:18 +0300
Subject: [PATCH] Python: gigasecond

---
 python/gigasecond/.exercism/metadata.json |  1 +
 python/gigasecond/README.md               | 53 +++++++++++++++++++++++
 python/gigasecond/gigasecond.py           |  4 ++
 python/gigasecond/gigasecond_test.py      | 37 ++++++++++++++++
 4 files changed, 95 insertions(+)
 create mode 100644 python/gigasecond/.exercism/metadata.json
 create mode 100644 python/gigasecond/README.md
 create mode 100644 python/gigasecond/gigasecond.py
 create mode 100644 python/gigasecond/gigasecond_test.py

diff --git a/python/gigasecond/.exercism/metadata.json b/python/gigasecond/.exercism/metadata.json
new file mode 100644
index 0000000..740ba4b
--- /dev/null
+++ b/python/gigasecond/.exercism/metadata.json
@@ -0,0 +1 @@
+{"track":"python","exercise":"gigasecond","id":"36f106558d3249349464451b901c54a0","url":"https://exercism.io/my/solutions/36f106558d3249349464451b901c54a0","handle":"DmitryKokorin","is_requester":true,"auto_approve":false}
\ No newline at end of file
diff --git a/python/gigasecond/README.md b/python/gigasecond/README.md
new file mode 100644
index 0000000..16053c0
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+++ b/python/gigasecond/README.md
@@ -0,0 +1,53 @@
+# Gigasecond
+
+Given a moment, determine the moment that would be after a gigasecond
+has passed.
+
+A gigasecond is 10^9 (1,000,000,000) seconds.
+
+
+## Exception messages
+
+Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to
+indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not
+every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include
+a message.
+
+To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
+`raise Exception`, you should write:
+
+```python
+raise Exception("Meaningful message indicating the source of the error")
+```
+
+## Running the tests
+
+To run the tests, run `pytest gigasecond_test.py`
+
+Alternatively, you can tell Python to run the pytest module:
+`python -m pytest gigasecond_test.py`
+
+### Common `pytest` options
+
+- `-v` : enable verbose output
+- `-x` : stop running tests on first failure
+- `--ff` : run failures from previous test before running other test cases
+
+For other options, see `python -m pytest -h`
+
+## Submitting Exercises
+
+Note that, when trying to submit an exercise, make sure the solution is in the `$EXERCISM_WORKSPACE/python/gigasecond` directory.
+
+You can find your Exercism workspace by running `exercism debug` and looking for the line that starts with `Workspace`.
+
+For more detailed information about running tests, code style and linting,
+please see [Running the Tests](http://exercism.io/tracks/python/tests).
+
+## Source
+
+Chapter 9 in Chris Pine's online Learn to Program tutorial. [http://pine.fm/LearnToProgram/?Chapter=09](http://pine.fm/LearnToProgram/?Chapter=09)
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.
diff --git a/python/gigasecond/gigasecond.py b/python/gigasecond/gigasecond.py
new file mode 100644
index 0000000..bff92d7
--- /dev/null
+++ b/python/gigasecond/gigasecond.py
@@ -0,0 +1,4 @@
+from datetime import datetime, timedelta
+
+def add(moment):
+    return moment + timedelta(seconds=1e+9)
diff --git a/python/gigasecond/gigasecond_test.py b/python/gigasecond/gigasecond_test.py
new file mode 100644
index 0000000..c787bae
--- /dev/null
+++ b/python/gigasecond/gigasecond_test.py
@@ -0,0 +1,37 @@
+from datetime import datetime
+import unittest
+
+from gigasecond import add
+
+# Tests adapted from `problem-specifications//canonical-data.json`
+
+
+class GigasecondTest(unittest.TestCase):
+    def test_date_only_specification_of_time(self):
+        self.assertEqual(
+            add(datetime(2011, 4, 25, 0, 0)), datetime(2043, 1, 1, 1, 46, 40)
+        )
+
+    def test_second_test_for_date_only_specification_of_time(self):
+        self.assertEqual(
+            add(datetime(1977, 6, 13, 0, 0)), datetime(2009, 2, 19, 1, 46, 40)
+        )
+
+    def test_third_test_for_date_only_specification_of_time(self):
+        self.assertEqual(
+            add(datetime(1959, 7, 19, 0, 0)), datetime(1991, 3, 27, 1, 46, 40)
+        )
+
+    def test_full_time_specified(self):
+        self.assertEqual(
+            add(datetime(2015, 1, 24, 22, 0)), datetime(2046, 10, 2, 23, 46, 40)
+        )
+
+    def test_full_time_with_day_roll_over(self):
+        self.assertEqual(
+            add(datetime(2015, 1, 24, 23, 59, 59)), datetime(2046, 10, 3, 1, 46, 39)
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()