Add test that all-cabal-nixes doesn't break anything

Author: cdepillabout

test/nixpkgs.nix

@@ -28,6 +28,9 @@ let
         # This also tests that our stacklock2nix-specific passthru values are working.
         all-cabal-hashes-is-dir = final.callPackage ./test-all-cabal-hashes-is-dir.nix {};
 
+        # This tests that the all-cabal-nixes argument works correctly.
+        all-cabal-nixes = final.callPackage ./test-all-cabal-nixes.nix {};
+
         # This test that a stack.yaml with no local packages defined is still
         # able to be used by stacklock2nix, and produces a reasonable package set.
         no-local-packages = final.callPackage ./test-no-local-packages {};

test/test-all-cabal-nixes.nix

@@ -0,0 +1,46 @@
+{ lib
+, stacklock2nix
+, haskell
+, cabal-install
+, fetchFromGitHub
+}:
+
+let
+  hasklib = haskell.lib.compose;
+
+  stacklock = stacklock2nix {
+    stackYaml = ../my-example-haskell-lib-easy/stack.yaml;
+    baseHaskellPkgSet = haskell.packages.ghc984;
+    additionalHaskellPkgSetOverrides = hfinal: hprev: {
+      # The servant-cassava.cabal file is malformed on GitHub:
+      # https://github.com/haskell-servant/servant-cassava/pull/29
+      servant-cassava =
+        hasklib.overrideCabal
+          { editedCabalFile = null; revision = null; }
+          hprev.servant-cassava;
+
+      amazonka = hasklib.dontCheck hprev.amazonka;
+      amazonka-core = hasklib.dontCheck hprev.amazonka-core;
+      amazonka-sso = hasklib.dontCheck hprev.amazonka-sso;
+      amazonka-sts = hasklib.dontCheck hprev.amazonka-sts;
+    };
+    cabal2nixArgsOverrides = args: args // {
+      amazonka-sso = ver: { amazonka-test = null; };
+      amazonka-sts = ver: { amazonka-test = null; };
+    };
+    all-cabal-hashes = fetchFromGitHub {
+      owner = "commercialhaskell";
+      repo = "all-cabal-hashes";
+      rev = "578b09df5072f21768cfe13edfc3e4c3e41428fc";
+      sha256 = "sha256-fmf4LukOJ2c0bCmNfuN+n2R6bxGhJqag9CBvZQEl3kA=";
+    };
+    # This test is to confirm that using `all-cabal-nixes` works.
+    all-cabal-nixes = fetchFromGitHub {
+      owner = "all-cabal-nixes";
+      repo = "all-cabal-nixes";
+      rev = "c37e66df270014a18ed11527db55928a4a2ae5d4";
+      sha256 = "sha256-QcAhW8yFGwj7L1LWbvjdSQ2bTDeQ+1DVeC+/jS4gJA4=";
+    };
+  };
+in
+stacklock.newPkgSet.my-example-haskell-app