Add client tests for psycopg2 python client

testing/PostgresDockerfile

@@ -15,6 +15,7 @@ RUN apt update -y && \
     apt install -y \
     python3.8 \
     python3-pip \
+    python3-psycopg2 \
     curl \
     wget \
     pkg-config \

testing/postgres-client-tests/postgres-client-tests.bats

@@ -45,7 +45,6 @@ teardown() {
     node $BATS_TEST_DIRNAME/node/workbench.js $USER $PORT $DOLTGRES_VERSION $BATS_TEST_DIRNAME/node/testdata
 }
 
-
 @test "perl DBI:Pg client" {
     perl $BATS_TEST_DIRNAME/perl/postgres-test.pl $USER $PORT
 }
@@ -68,3 +67,8 @@ teardown() {
     (cd $BATS_TEST_DIRNAME/c; make clean; make)
     $BATS_TEST_DIRNAME/c/postgres-c-connector-test $USER $PORT
 }
+
+@test "python postgres: psycopg2 client" {
+    cd $BATS_TEST_DIRNAME/python
+    python3 psycopg2_test.py $USER $PORT
+}

testing/postgres-client-tests/python/psycopg2_test.py

@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+import os
+import sys
+import traceback
+import psycopg2
+
+# ---------------------------------------------------------------------------
+# Query list (kept at top for consistency with other tests)
+# ---------------------------------------------------------------------------
+
+TEST_QUERIES = [
+    "DROP TABLE IF EXISTS test",
+    "create table test (pk int, value int, d1 decimal(9, 3), f1 float, c1 char(10), t1 text, primary key(pk))",
+    "select * from test",
+    "insert into test (pk, value, d1, f1, c1, t1) values (0,0,0.0,0.0,'abc','a1')",
+    "select * from test",
+    "select dolt_add('-A');",
+    "select dolt_commit('-m', 'my commit')",
+    "select COUNT(*) FROM dolt.log",
+    "select dolt_checkout('-b', 'mybranch')",
+    "insert into test (pk, value, d1, f1, c1, t1) values (10,10, 123456.789, 420.42,'example','some text')",
+    "select dolt_commit('-a', '-m', 'my commit2')",
+    "select dolt_checkout('main')",
+    "select dolt_merge('mybranch')",
+    "select COUNT(*) FROM dolt.log",
+]
+
+# ---------------------------------------------------------------------------
+
+def env(name, default=None):
+    return os.getenv(name, default)
+
+
+def connect(user: str, port: int):
+    conn = psycopg2.connect(
+        host=env("PGHOST", "localhost"),
+        port=port,
+        dbname="postgres",
+        user=user,
+        password=env("PGPASSWORD", "password"),
+        connect_timeout=int(env("PGCONNECT_TIMEOUT", "10")),
+        sslmode=env("PGSSLMODE"),
+    )
+    conn.autocommit = True
+    return conn
+
+
+def run(cur, q):
+    print(f"SQL> {q}", flush=True)
+    cur.execute(q)
+    if cur.description is not None:
+        cur.fetchall()  # drain result set
+
+# load_test creates a table with |n_rows| and asserts that all rows are correctly returned.
+def load_test(cur, n_rows=1000):
+    print("\n=== Part 1: Load test ===", flush=True)
+
+    rows = max(1000, int(n_rows))
+
+    run(cur, "DROP TABLE IF EXISTS load_test")
+    run(cur, "CREATE TABLE load_test (id INT PRIMARY KEY, val INT NOT NULL)")
+
+    data = [(i, i * 10) for i in range(rows)]
+    cur.executemany(
+        "INSERT INTO load_test (id, val) VALUES (%s, %s)",
+        data,
+    )
+
+    cur.execute("SELECT COUNT(*) FROM load_test")
+    cnt = cur.fetchone()[0]
+    if cnt != rows:
+        raise AssertionError(f"COUNT(*) mismatch: expected {rows}, got {cnt}")
+
+    cur.execute("SELECT id FROM load_test ORDER BY id")
+    got = cur.fetchall()
+    if len(got) != rows:
+        raise AssertionError(f"fetchall mismatch: expected {rows}, got {len(got)}")
+
+    print(f"Inserted and selected {rows} rows OK.", flush=True)
+
+
+def compliance_test(cur):
+    print("\n=== Part 2: Test Queries ===", flush=True)
+    for q in TEST_QUERIES:
+        run(cur, q)
+    print("Compliance queries executed OK.", flush=True)
+
+
+def main():
+    if len(sys.argv) != 3:
+        print("Usage: python3 psycopg2_test.py <user> <port>")
+        return 2
+
+    user = sys.argv[1]
+    port = int(sys.argv[2])
+    load_rows = int(env("LOAD_ROWS", "1000"))
+
+    try:
+        with connect(user, port) as conn:
+            with conn.cursor() as cur:
+                load_test(cur, load_rows)
+                compliance_test(cur)
+
+        print("\n✅ All tests passed.", flush=True)
+        return 0
+
+    except Exception as e:
+        print("\n❌ Test failed.", flush=True)
+        print(f"Error: {e}", flush=True)
+        traceback.print_exc()
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())