Add tests to cover passthrough scenario after a cassette has been used

fixture/vcr_cassettes/hackney_get_localhost.json

@@ -0,0 +1,25 @@
+[
+  {
+    "request": {
+      "body": "",
+      "headers": [],
+      "method": "get",
+      "options": {
+        "with_body": "true"
+      },
+      "request_body": "",
+      "url": "http://localhost:34009/server"
+    },
+    "response": {
+      "binary": false,
+      "body": "test_response",
+      "headers": {
+        "server": "Cowboy",
+        "date": "Tue, 29 Sep 2020 11:50:14 GMT",
+        "content-length": "13"
+      },
+      "status_code": 200,
+      "type": "ok"
+    }
+  }
+]

fixture/vcr_cassettes/httpc_get_localhost.json

@@ -0,0 +1,30 @@
+[
+  {
+    "request": {
+      "body": "",
+      "headers": [],
+      "method": "get",
+      "options": {
+        "httpc_options": [],
+        "http_options": []
+      },
+      "request_body": "",
+      "url": "http://localhost:34010/server"
+    },
+    "response": {
+      "binary": false,
+      "body": "test_response",
+      "headers": {
+        "date": "Tue, 29 Sep 2020 11:52:26 GMT",
+        "server": "Cowboy",
+        "content-length": "13"
+      },
+      "status_code": [
+        "HTTP/1.1",
+        200,
+        "OK"
+      ],
+      "type": "ok"
+    }
+  }
+]

fixture/vcr_cassettes/ibrowse_get_localhost.json

@@ -0,0 +1,23 @@
+[
+  {
+    "request": {
+      "body": "",
+      "headers": [],
+      "method": "get",
+      "options": [],
+      "request_body": "",
+      "url": "http://localhost:34011/server"
+    },
+    "response": {
+      "binary": false,
+      "body": "test_response",
+      "headers": {
+        "server": "Cowboy",
+        "date": "Tue, 29 Sep 2020 11:56:58 GMT",
+        "content-length": "13"
+      },
+      "status_code": 200,
+      "type": "ok"
+    }
+  }
+]

test/adapter_hackney_test.exs

@@ -2,11 +2,27 @@ defmodule ExVCR.Adapter.HackneyTest do
   use ExUnit.Case, async: true
   use ExVCR.Mock, adapter: ExVCR.Adapter.Hackney
 
+  @port 34009
+
   setup_all do
+    HttpServer.start(path: "/server", port: @port, response: "test_response")
     {:ok, _} = HTTPoison.start
+    on_exit fn ->
+      HttpServer.stop(@port)
+    end
     :ok
   end
 
+  test "passthrough works after cassette has been used" do
+    url = "http://localhost:#{@port}/server"
+    use_cassette "hackney_get_localhost" do
+      {:ok, status_code, _headers, _body} = :hackney.request(:get, url, [], [], [with_body: true])
+      assert status_code == 200
+    end
+    {:ok, status_code, _headers, _body} = :hackney.request(:get, url, [], [], [with_body: true])
+    assert status_code == 200
+  end
+
   test "hackney request" do
     use_cassette "hackney_get" do
       {:ok, status_code, headers, client} = :hackney.request(:get, "http://www.example.com", [], [], [])

test/adapter_httpc_test.exs

@@ -2,11 +2,29 @@ defmodule ExVCR.Adapter.HttpcTest do
   use ExUnit.Case, async: true
   use ExVCR.Mock, adapter: ExVCR.Adapter.Httpc
 
+  @port 34010
+
   setup_all do
+    HttpServer.start(path: "/server", port: @port, response: "test_response")
     Application.ensure_started(:inets)
+    on_exit fn ->
+      HttpServer.stop(@port)
+    end
     :ok
   end
 
+  test "passthrough works after cassette has been used" do
+    url = "http://localhost:#{@port}/server" |> to_char_list()
+    use_cassette "httpc_get_localhost" do
+      {:ok, result} = :httpc.request(url)
+      {{_http_version, status_code, _reason_phrase}, _headers, _body} = result
+      assert status_code == 200
+    end
+    {:ok, result} = :httpc.request(url)
+    {{_http_version, status_code, _reason_phrase}, _headers, _body} = result
+    assert status_code == 200
+  end
+
   test "example httpc request/1" do
     use_cassette "example_httpc_request_1" do
       {:ok, result} = :httpc.request('http://example.com')

test/adapter_ibrowse_test.exs

@@ -2,12 +2,29 @@ defmodule ExVCR.Adapter.IBrowseTest do
   use ExUnit.Case, async: true
   use ExVCR.Mock
 
+  @port 34011
+
   setup_all do
-    HTTPotion.start
+    HttpServer.start(path: "/server", port: @port, response: "test_response")
     Application.ensure_started(:ibrowse)
+    on_exit fn ->
+      HttpServer.stop(@port)
+    end
     :ok
   end
 
+
+  test "passthrough works after cassette has been used" do
+    url = "http://localhost:#{@port}/server" |> to_char_list()
+    use_cassette "ibrowse_get_localhost" do
+      {:ok, status_code, _headers, _body} = :ibrowse.send_req(url, [], :get)
+      assert status_code == '200'
+    end
+    {:ok, status_code, _headers, _body} = :ibrowse.send_req(url, [], :get)
+    assert status_code == '200'
+  end
+
+
   test "example single request" do
     use_cassette "example_ibrowse" do
       {:ok, status_code, headers, body} = :ibrowse.send_req('http://example.com', [], :get)