fetchGit: add simple test for ssh fetching

Also move tests to separate files which are auto-imported. This should allow people adding tests concurrently without introducing merge conflicts

tests/nixos/fetch-git/default.nix

@@ -8,53 +8,25 @@
 
   /*
   Test cases
+
+  Test cases are automatically imported from ./test-cases/{name}
+
   The following is set up automatically for each test case:
     - a repo with the {name} is created on the gitea server
     - a repo with the {name} is created on the client
     - the client repo is configured to push to the server repo
+
   Python variables:
     - repo.path: the path to the directory of the client repo
     - repo.git: the git command with the client repo as the working directory
     - repo.remote: the url to the server repo
   */
-  testCases = [
-    {
-      name = "simple-http";
-      description = "can fetch a git repo via http";
-      script = ''
-        # add a file to the repo
-        client.succeed(f"""
-          echo chiang-mai > {repo.path}/thailand \
-          && {repo.git} add thailand \
-          && {repo.git} commit -m 'commit1'
-        """)
-
-        # memoize the revision
-        rev1 = client.succeed(f"""
-          {repo.git} rev-parse HEAD
-        """).strip()
-
-        # push to the server
-        client.succeed(f"""
-          {repo.git} push origin main
-        """)
-
-        # fetch the repo via nix
-        fetched1 = client.succeed(f"""
-          nix eval --impure --raw --expr "(builtins.fetchGit {repo.remote}).outPath"
-        """)
-
-        # check if the committed file is there
-        client.succeed(f"""
-          test -f {fetched1}/thailand
-        """)
-
-        # check if the revision is the same
-        rev1_fetched = client.succeed(f"""
-          nix eval --impure --raw --expr "(builtins.fetchGit {repo.remote}).rev"
-        """).strip()
-        assert rev1 == rev1_fetched
-      '';
-    }
-  ];
+  testCases =
+    map
+    (testCaseName: {...}: {
+      imports = ["${./test-cases}/${testCaseName}"];
+      # ensures tests are named like their directories they are defined in
+      name = testCaseName;
+    })
+    (lib.attrNames (builtins.readDir ./test-cases));
 }