1 files changed, 76 insertions, 0 deletions
diff --git a/tests/test_pgcompleter.py b/tests/test_pgcompleter.py
new file mode 100644
index 0000000..909fa0b
--- /dev/null
+++ b/tests/test_pgcompleter.py
@@ -0,0 +1,76 @@
+import pytest
+from pgcli import pgcompleter
+
+
+def test_load_alias_map_file_missing_file():
+    with pytest.raises(
+        pgcompleter.InvalidMapFile,
+        match=r"Cannot read alias_map_file - /path/to/non-existent/file.json does not exist$",
+    ):
+        pgcompleter.load_alias_map_file("/path/to/non-existent/file.json")
+
+
+def test_load_alias_map_file_invalid_json(tmp_path):
+    fpath = tmp_path / "foo.json"
+    fpath.write_text("this is not valid json")
+    with pytest.raises(pgcompleter.InvalidMapFile, match=r".*is not valid json$"):
+        pgcompleter.load_alias_map_file(str(fpath))
+
+
+@pytest.mark.parametrize(
+    "table_name, alias",
+    [
+        ("SomE_Table", "SET"),
+        ("SOmeTabLe", "SOTL"),
+        ("someTable", "T"),
+    ],
+)
+def test_generate_alias_uses_upper_case_letters_from_name(table_name, alias):
+    assert pgcompleter.generate_alias(table_name) == alias
+
+
+@pytest.mark.parametrize(
+    "table_name, alias",
+    [
+        ("some_tab_le", "stl"),
+        ("s_ome_table", "sot"),
+        ("sometable", "s"),
+    ],
+)
+def test_generate_alias_uses_first_char_and_every_preceded_by_underscore(
+    table_name, alias
+):
+    assert pgcompleter.generate_alias(table_name) == alias
+
+
+@pytest.mark.parametrize(
+    "table_name, alias_map, alias",
+    [
+        ("some_table", {"some_table": "my_alias"}, "my_alias"),
+    ],
+)
+def test_generate_alias_can_use_alias_map(table_name, alias_map, alias):
+    assert pgcompleter.generate_alias(table_name, alias_map) == alias
+
+
+@pytest.mark.parametrize(
+    "table_name, alias_map, alias",
+    [
+        ("SomeTable", {"SomeTable": "my_alias"}, "my_alias"),
+    ],
+)
+def test_generate_alias_prefers_alias_over_upper_case_name(
+    table_name, alias_map, alias
+):
+    assert pgcompleter.generate_alias(table_name, alias_map) == alias
+
+
+@pytest.mark.parametrize(
+    "table_name, alias",
+    [
+        ("Some_tablE", "SE"),
+        ("SomeTab_le", "ST"),
+    ],
+)
+def test_generate_alias_prefers_upper_case_name_over_underscore_name(table_name, alias):
+    assert pgcompleter.generate_alias(table_name) == alias