added tests for loading custom driver (#25)

* added tests for loading custom driver

* ignore duckdb by default

* include duckdb tests on linux ci

Co-authored-by: José Valim <[email protected]>

---------

Co-authored-by: José Valim <[email protected]>

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Compile and Test
         run: |
           mix deps.get
-          mix test
+          mix test --include duckdb
 
   windows:
     if: "!contains(github.event.pull_request.labels.*.name, 'skip ci')"

test/adbc_database_test.exs

@@ -3,6 +3,36 @@ defmodule Adbc.DatabaseTest do
   doctest Adbc.Database
   alias Adbc.Database
 
+  setup_all do
+    {:ok, zip_data} =
+      Adbc.Helper.download(
+        "https://github.com/duckdb/duckdb/releases/download/v0.8.1/libduckdb-linux-amd64.zip",
+        false
+      )
+
+    tmp_dir = System.tmp_dir!()
+    cache_path = Path.join(tmp_dir, "libduckdb-linux-amd64.zip")
+    File.write!(cache_path, zip_data)
+
+    cache_path = String.to_charlist(cache_path)
+    {:ok, zip_handle} = :zip.zip_open(cache_path, [:memory])
+    {:ok, zip_files} = :zip.table(cache_path)
+
+    for {:zip_file, filename, _, _, _, _} <- zip_files,
+        Path.extname(filename) == ".so" do
+      {:ok, {filename, file_data}} = :zip.zip_get(filename, zip_handle)
+
+      filename = to_string(filename)
+
+      filepath = Path.join(tmp_dir, filename)
+      File.write!(filepath, file_data)
+    end
+
+    :ok = :zip.zip_close(zip_handle)
+
+    %{path: Path.join(tmp_dir, "libduckdb.so"), entrypoint: "duckdb_adbc_init"}
+  end
+
   describe "start_link" do
     test "starts a process" do
       assert {:ok, _} = Database.start_link(driver: :sqlite)
@@ -33,4 +63,18 @@ defmodule Adbc.DatabaseTest do
       assert Exception.message(error) == "[SQLite] Unknown database option who_knows=123"
     end
   end
+
+  describe "load custom driver" do
+    @describetag :duckdb
+
+    test "load duckdb", %{path: path, entrypoint: entrypoint} do
+      assert {:ok, _} = Database.start_link(driver: path, entrypoint: entrypoint)
+    end
+
+    test "load duckdb with invalid entrypoint", %{path: path} do
+      assert {:error, %Adbc.Error{} = error} = Database.start_link(driver: path, entrypoint: "entrypoint")
+
+      assert Exception.message(error) =~ "dlsym(entrypoint) failed:"
+    end
+  end
 end

test/test_helper.exs

@@ -8,4 +8,6 @@ exclude =
     [:postgresql]
   end
 
+exclude = exclude ++ [:duckdb]
+
 ExUnit.start(exclude: exclude)