Use encoding="UTF-8" and locale="en_US.UTF-8"

If not explicitly specified, PostgreSQL infers both locale and encoding
from the locale settings upon database initialization. Speaking about
GitHub runners, they all have different locale settings. For instance,
Windows runner uses `CP1252` encoding which renders the database unable
to deal with non-latin characters.

This patch enforces encoding="UTF-8" and locale="en_US.UTF-8" on all
supported platforms in order to ensure that the database behaves the
same way in certain edge cases.

Fixes #3

Author: ikalnytskyi

README.md

@@ -27,19 +27,19 @@ key features:
 
 ```yaml
 steps:
-  - uses: ikalnytskyi/action-setup-postgres@v2
+  - uses: ikalnytskyi/action-setup-postgres@v3
 ```
 
 #### Advanced
 
 ```yaml
 steps:
-  - uses: ikalnytskyi/action-setup-postgres@v2
+  - uses: ikalnytskyi/action-setup-postgres@v3
     with:
       username: ci
       password: sw0rdfish
       database: test
-      port: "34837"
+      port: 34837
     id: postgres
 
   - run: pytest -vv tests/

action.yml

@@ -42,7 +42,7 @@ runs:
     - name: Setup and start PostgreSQL
       run: |
         export PGDATA="$RUNNER_TEMP/pgdata"
-        pg_ctl init
+        pg_ctl init --options="--encoding=UTF-8 --locale=en_US.UTF-8"
 
         # Forbid creating unix sockets since they are created by default in the
         # directory we don't have permissions to.

test_action.py

@@ -25,6 +25,19 @@ def test_connection_uri():
     assert connection_uri == expected_connection_uri
 
 
+def test_server_encoding(connection: psycopg.Connection):
+    """Test that PostgreSQL's encoding is 'UTF-8'."""
+
+    assert connection.execute("SHOW SERVER_ENCODING").fetchone()[0] == "UTF8"
+
+
+def test_locale(connection: psycopg.Connection):
+    """Test that PostgreSQL's locale is 'en_US.UTF-8'."""
+
+    assert connection.execute("SHOW LC_COLLATE").fetchone()[0] == "en_US.UTF-8"
+    assert connection.execute("SHOW LC_CTYPE").fetchone()[0] == "en_US.UTF-8"
+
+
 def test_user_permissions(connection: psycopg.Connection):
     """Test that a user can create databases but is not a superuser."""
 
@@ -53,6 +66,21 @@ def test_user_create_insert_select(connection: psycopg.Connection):
         assert records == [(1, "42")]
 
 
+def test_user_create_insert_non_ascii(connection: psycopg.Connection):
+    """Test that non-ASCII characters can be stored and fetched."""
+
+    table_name = "test_setup_postgres"
+
+    with connection, connection.transaction(force_rollback=True):
+        records = connection \
+            .execute(f"CREATE TABLE {table_name}(eggs INTEGER, rice VARCHAR)") \
+            .execute(f"INSERT INTO {table_name}(eggs, rice) VALUES (1, 'Україна')") \
+            .execute(f"INSERT INTO {table_name}(eggs, rice) VALUES (2, 'ウクライナ')") \
+            .execute(f"SELECT * FROM {table_name}") \
+            .fetchall()
+        assert records == [(1, "Україна"), (2, "ウクライナ")]
+
+
 def test_user_create_drop_database(connection: psycopg.Connection):
     """Test that a user has no permissions to create databases."""