chore: fix tests with Elixir 1.13.0.

config/config.exs

@@ -1,4 +1,4 @@
-use Mix.Config
+import Config
 
 config :wafer, Wafer.Driver.Fake, warn: Mix.env() != :test
 

test/dll_test.exs

@@ -12,7 +12,7 @@ defmodule WaferDLLTest do
 
     assert Tx.complete?(tx)
     assert Rx.complete?(rx)
-    assert {:ok, value} = Rx.value(rx)
+    assert {:ok, ^value} = Rx.value(rx)
   end
 
   def transmit(%Tx{} = tx, %Rx{} = rx) do

test/drivers/circuits_gpio_dispatcher_test.exs

@@ -23,7 +23,7 @@ defmodule WaferDriverCircuits.GPIO.DispatcherTest do
         :ok
       end)
 
-      assert {:reply, {:ok, conn}, _state} =
+      assert {:reply, {:ok, _conn}, _state} =
                Dispatcher.handle_call({:enable, conn, :rising}, nil, state())
     end
 
@@ -37,7 +37,7 @@ defmodule WaferDriverCircuits.GPIO.DispatcherTest do
         :ok
       end)
 
-      assert {:reply, {:ok, conn}, _state} =
+      assert {:reply, {:ok, _conn}, _state} =
                Dispatcher.handle_call({:enable, conn, :falling}, nil, state())
     end
 
@@ -51,7 +51,7 @@ defmodule WaferDriverCircuits.GPIO.DispatcherTest do
         :ok
       end)
 
-      assert {:reply, {:ok, conn}, _state} =
+      assert {:reply, {:ok, _conn}, _state} =
                Dispatcher.handle_call({:enable, conn, :both}, nil, state())
     end
 
@@ -63,7 +63,7 @@ defmodule WaferDriverCircuits.GPIO.DispatcherTest do
 
       Dispatcher.handle_call({:enable, conn, :rising}, nil, state())
 
-      assert {:reply, {:ok, conn}, _state} =
+      assert {:reply, {:ok, _conn}, _state} =
                Dispatcher.handle_call({:disable, conn, :rising}, nil, state())
     end
 
@@ -75,7 +75,7 @@ defmodule WaferDriverCircuits.GPIO.DispatcherTest do
 
       Dispatcher.handle_call({:enable, conn, :falling}, nil, state())
 
-      assert {:reply, {:ok, conn}, _state} =
+      assert {:reply, {:ok, _conn}, _state} =
                Dispatcher.handle_call({:disable, conn, :falling}, nil, state())
     end
 
@@ -87,7 +87,7 @@ defmodule WaferDriverCircuits.GPIO.DispatcherTest do
 
       Dispatcher.handle_call({:enable, conn, :both}, nil, state())
 
-      assert {:reply, {:ok, conn}, _state} =
+      assert {:reply, {:ok, _conn}, _state} =
                Dispatcher.handle_call({:disable, conn, :both}, nil, state())
 
       refute IR.subscribers?({Dispatcher, 1}, :both)

test/drivers/circuits_i2c_test.exs

@@ -23,7 +23,7 @@ defmodule WaferCircuits.I2CTest do
         [address]
       end)
 
-      assert {:ok, %Subject{} = conn} = Subject.acquire(bus_name: busname, address: address)
+      assert {:ok, %Subject{}} = Subject.acquire(bus_name: busname, address: address)
     end
 
     test "when the device is not present on the bus" do
@@ -59,8 +59,7 @@ defmodule WaferCircuits.I2CTest do
         []
       end)
 
-      assert {:ok, %Subject{} = conn} =
+      assert {:ok, %Subject{}} = Subject.acquire(bus_name: busname, address: address, force: true)
-               Subject.acquire(bus_name: busname, address: address, force: true)
     end
 
     test "when the bus name is not specified it returns an error" do

test/drivers/elixir_ale_i2c_test.exs

@@ -24,7 +24,7 @@ defmodule WaferElixirALE.I2CTest do
         [address]
       end)
 
-      assert {:ok, %Subject{} = conn} = Subject.acquire(bus_name: busname, address: address)
+      assert {:ok, %Subject{}} = Subject.acquire(bus_name: busname, address: address)
     end
 
     test "when the device is not present on the bus" do
@@ -62,8 +62,7 @@ defmodule WaferElixirALE.I2CTest do
         []
       end)
 
-      assert {:ok, %Subject{} = conn} =
+      assert {:ok, %Subject{}} = Subject.acquire(bus_name: busname, address: address, force: true)
-               Subject.acquire(bus_name: busname, address: address, force: true)
     end
 
     test "when the bus name is not specified it returns an error" do

test/interrupt_registry_test.exs

@@ -100,7 +100,6 @@ defmodule WaferInterruptRegistryTest do
     end
 
     test "returns false if there are no subscribers for `key` and `pin_condition`" do
-      receiver = self()
       :ok = IR.subscribe(:key, :rising, :conn, :metadata)
 
       refute IR.subscribers?(:key, :falling)

test/support/test_utils.exs

@@ -1,12 +1,18 @@
 defmodule TestUtils do
   @moduledoc false
 
+  @chars ~w[A B C D E F G H I J K L M N O P Q R S T U V W X Y Z]
+
   def random_module_name do
-    name =
+    name = random_string("", 16)
-      16
-      |> :crypto.strong_rand_bytes()
-      |> Base.encode64(padding: false)
 
     Module.concat(__MODULE__, name)
   end
+
+  defp random_string(str, 0), do: str
+
+  defp random_string(str, count) do
+    "#{str}#{Enum.random(@chars)}"
+    |> random_string(count - 1)
+  end
 end