diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -2,6 +2,10 @@
 
 `wai-middleware-delegate` uses [PVP Versioning][1].
 
+## 0.1.2.3 -- 2021-09-30
+
+* Add missing data files needed by the tests
+
 ## 0.1.2.2 -- 2021-09-29
 
 * Fix the module documentation
diff --git a/test/IntegrationTest.hs b/test/IntegrationTest.hs
--- a/test/IntegrationTest.hs
+++ b/test/IntegrationTest.hs
@@ -64,7 +64,9 @@
 testWithInsecureRedirects = testWithApplication (defaultTestDelegate redirectTestSettings)
 
 testWithSecureProxy :: (Port -> IO ()) -> IO ()
-testWithSecureProxy = testWithTLSApplication defaultTlsSettings (defaultTestDelegate defaultTestSettings)
+testWithSecureProxy withPort = do
+  tls <- defaultTlsSettings
+  testWithTLSApplication tls (defaultTestDelegate defaultTestSettings) withPort
 
 onDirectAndProxy :: (HttpReply -> HttpReply -> IO ()) -> Bool -> Int -> RequestBuilder -> IO ()
 onDirectAndProxy f debug testProxyPort builder = do
diff --git a/test/Test/WithExtras.hs b/test/Test/WithExtras.hs
--- a/test/Test/WithExtras.hs
+++ b/test/Test/WithExtras.hs
@@ -14,17 +14,22 @@
 import           Network.Socket                    (Socket, close)
 import           Network.Wai                       (Application)
 import           Network.Wai.Handler.Warp.Internal (settingsBeforeMainLoop)
-
 import           Network.Wai.Handler.Warp          (Port, Settings,
-                                                    defaultShouldDisplayException,
                                                     defaultSettings,
+                                                    defaultShouldDisplayException,
                                                     openFreePort)
-import           Network.Wai.Handler.WarpTLS       (TLSSettings,
-                                                    runTLSSocket, tlsSettings)
+import           Network.Wai.Handler.WarpTLS       (TLSSettings, runTLSSocket,
+                                                    tlsSettings)
 
+import           Paths_wai_middleware_delegate     (getDataFileName)
+
 -- | The settings used in the integration tests
-defaultTlsSettings :: TLSSettings
-defaultTlsSettings = tlsSettings "test/certificate.pem" "test/key.pem"
+defaultTlsSettings :: IO TLSSettings
+defaultTlsSettings =
+  tlsSettings
+ <$> (getDataFileName "test/certificate.pem")
+ <*> (getDataFileName "test/key.pem")
+
 
 -- | Runs the given 'Application' on a free port. Passes the port to the given
 -- operation and executes it, while the 'Application' is running. Shuts down the
diff --git a/test/certificate.csr b/test/certificate.csr
new file mode 100644
--- /dev/null
+++ b/test/certificate.csr
@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE REQUEST-----
+MIIElTCCAn0CAQAwUDELMAkGA1UEBhMCSlAxDDAKBgNVBAgTA0ZVSzERMA8GA1UE
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+cRqVssVWMITl9jBzDHoeRlPO/zmgqND/nw==
+-----END CERTIFICATE REQUEST-----
diff --git a/test/certificate.pem b/test/certificate.pem
new file mode 100644
--- /dev/null
+++ b/test/certificate.pem
@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
+MIIFHDCCAwQCCQCskmvu2cKsdTANBgkqhkiG9w0BAQUFADBQMQswCQYDVQQGEwJK
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+t7YrGY8rPiubWMWRZw5UwA==
+-----END CERTIFICATE-----
diff --git a/test/key.pem b/test/key.pem
new file mode 100644
--- /dev/null
+++ b/test/key.pem
@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIJJwIBAAKCAgEAyVm9wmE7aMKsQB+ZEhH/p8F+hiYLSZNLmvCF+oHmCQ5/swiK
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+-----END RSA PRIVATE KEY-----
diff --git a/wai-middleware-delegate.cabal b/wai-middleware-delegate.cabal
--- a/wai-middleware-delegate.cabal
+++ b/wai-middleware-delegate.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               wai-middleware-delegate
-version:            0.1.2.2
+version:            0.1.2.3
 synopsis:           WAI middleware that delegates handling of requests.
 description:
   [WAI](http://hackage.haskell.org/package/wai) middleware that intercepts requests
@@ -22,6 +22,8 @@
 build-type:         Simple
 extra-source-files:
   ChangeLog.md
+  test/*.csr
+  test/*.pem
 
 source-repository head
   type:     git
@@ -52,11 +54,13 @@
 test-suite integration-test
   type:             exitcode-stdio-1.0
   main-is:          IntegrationTest.hs
+  autogen-modules:  Paths_wai_middleware_delegate
   other-modules:
     Test.Fetch
     Test.HttpReply
     Test.TestRequests
     Test.WithExtras
+    Paths_wai_middleware_delegate
 
   hs-source-dirs:   test
   build-depends: