add test

.gitignore

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+result

README.md

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+# swh-ipfs-test
+
+Tests fetching some known-good data from IPFS, and fetching a SWHID.
+Since we have no bridge, and IPFS doesn't understand SWHIDs (yet), we
+currently test for this fetch to fail.
+
+```
+$ nix-build . -A driver
+$ result/bin/nixos-test-driver
+```
+
+and call the Python function `test_script()`.

default.nix

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+let
+  pkgs = import (builtins.fetchGit {
+    name = "pinned-nixpkgs-21.11";                                                 
+    url = "https://github.com/NixOS/nixpkgs/";                       
+    ref = "refs/heads/nixos-21.11";                     
+    rev = "860b56be91fb874d48e23a950815969a7b832fbc";                                           
+  }) {};                                                                           
+
+  # TODO: This is where I'd put our IPFS plugin (if we had one!!)
+  ipfs = pkgs.ipfs;
+
+  # CID representing the SWHID
+  # https://archive.softwareheritage.org/browse/snapshot/c7c108084bc0bf3d81436bf980b46e98bd338453/directory/
+  # (no particular attachment to darkroom, it was just the example
+  # snapshot from the SWHID docs)
+  swhid_cid = "znDfqECWqk8VqwNL2ayyYnvJdwDN9qYqa2";
+
+  # CID pointing to GNU Hello on Git (taken from the Nix-IPFS
+  # integration docs)
+  known_good_cid = "baf4bcfgi2up65zpzhg2fmyi52kecqfhsaevbaha";
+in
+
+  pkgs.nixosTest {
+    system = "x86_64-linux";
+    machine = { config, pkgs, ... }: {
+      networking.firewall.enable = false;
+      services.ipfs = {
+        enable = true;
+        apiAddress = "/ip4/127.0.0.1/tcp/2324";
+      };
+    };
+    skipLint = true;
+
+    # TODO: Add bridge node (when we have a bridge)
+    testScript = ''
+      import json
+      import sys
+
+      machine.wait_for_unit('ipfs')
+      print(machine.wait_until_succeeds('ipfs swarm peers | grep ip4'))
+
+      machine.succeed(
+        'ipfs --api /ip4/127.0.0.1/tcp/2324 dag get "${known_good_cid}"'
+      )
+
+      # Hangs forever because IPFS doesn't understand our CID
+      machine.fail(
+        'timeout 5 ipfs dag get ${swhid_cid}'
+      )
+    '';
+  }