1 files changed, 57 insertions, 0 deletions
diff --git a/tests/test_encodings.py b/tests/test_encodings.py
new file mode 100644
index 0000000..113f0e3
--- /dev/null
+++ b/tests/test_encodings.py
@@ -0,0 +1,57 @@
+import codecs
+import pytest
+
+import psycopg
+from psycopg import _encodings as encodings
+
+
+def test_names_normalised():
+    for name in encodings._py_codecs.values():
+        assert codecs.lookup(name).name == name
+
+
+@pytest.mark.parametrize(
+    "pyenc, pgenc",
+    [
+        ("ascii", "SQL_ASCII"),
+        ("utf8", "UTF8"),
+        ("utf-8", "UTF8"),
+        ("uTf-8", "UTF8"),
+        ("latin9", "LATIN9"),
+        ("iso8859-15", "LATIN9"),
+    ],
+)
+def test_py2pg(pyenc, pgenc):
+    assert encodings.py2pgenc(pyenc) == pgenc.encode()
+
+
+@pytest.mark.parametrize(
+    "pyenc, pgenc",
+    [
+        ("ascii", "SQL_ASCII"),
+        ("utf-8", "UTF8"),
+        ("iso8859-15", "LATIN9"),
+    ],
+)
+def test_pg2py(pyenc, pgenc):
+    assert encodings.pg2pyenc(pgenc.encode()) == pyenc
+
+
+@pytest.mark.parametrize("pgenc", ["MULE_INTERNAL", "EUC_TW"])
+def test_pg2py_missing(pgenc):
+    with pytest.raises(psycopg.NotSupportedError):
+        encodings.pg2pyenc(pgenc.encode())
+
+
+@pytest.mark.parametrize(
+    "conninfo, pyenc",
+    [
+        ("", "utf-8"),
+        ("user=foo, dbname=bar", "utf-8"),
+        ("user=foo, dbname=bar, client_encoding=EUC_JP", "euc_jp"),
+        ("user=foo, dbname=bar, client_encoding=euc-jp", "euc_jp"),
+        ("user=foo, dbname=bar, client_encoding=WAT", "utf-8"),
+    ],
+)
+def test_conninfo_encoding(conninfo, pyenc):
+    assert encodings.conninfo_encoding(conninfo) == pyenc