2 files changed, 21 insertions, 8 deletions

diff --git a/tests/default.nix b/tests/default.nix
index 4d0e256..ca409b3 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -5,9 +5,10 @@
 { pkgs ? import ../pkgs {} }:
 
 let
-  # HEAD of /fixtures/gitsrc, which fixtures.sh creates deterministically.
-  # fixtures.sh fails if it differs, naming the actual one.
+  # HEAD of /fixtures/gitsrc, which fixtures.sh creates deterministically,
+  # and its parent.  fixtures.sh fails if HEAD differs, naming the actual one.
   gitHead = "e42d44ef9cdb76ba5a84dff4c89c38222703bf0c";
+  gitFirst = "8d47013fa0888948cf0ffcc4e3c69a7b5f180562";
 
   scenarios = import ./scenarios.nix {
     inherit (pkgs) lib;
@@ -18,7 +19,7 @@ let
     gitUrl = "git://deployer/gitsrc.git";
     remoteHost = "target";
     agePath = "${pkgs.age}/bin/age";
-    inherit gitHead;
+    inherit gitHead gitFirst;
   };
 in
   builtins.mapAttrs
diff --git a/tests/scenarios.nix b/tests/scenarios.nix
index e56cb13..4838b74 100644
--- a/tests/scenarios.nix
+++ b/tests/scenarios.nix
@@ -23,8 +23,9 @@
   remoteHost,
   # Absolute path of age on the deploying machine.
   agePath,
-  # HEAD of /fixtures/gitsrc.
+  # HEAD of /fixtures/gitsrc, and its parent.
   gitHead,
+  gitFirst,
 }:
 
 let
@@ -363,10 +364,10 @@ assert !(krops.isLocalTarget (targets.remote "/"));
       gc
       expect_eq msg "$(nix_eval "$T"/.populate/flakes/x#msg)" git:alt
     '';
-    sources = {
+    sources = ref: {
       x.git = {
         url = gitUrl;
-        ref = gitHead;
+        inherit ref;
         inherit (flags) shallow fetchAlways;
         clean.exclude = optional flags.cleanExclude "keepme";
         inputs = optionalAttrs flags.inputs { dep.follows = "alt"; };
@@ -374,15 +375,26 @@ assert !(krops.isLocalTarget (targets.remote "/"));
     } // optionalAttrs flags.inputs alt;
   in {
     phases = [
+      # The older commit first, so deploying HEAD changes the work tree, and
+      # fetches if fetchAlways is set or the clone is shallow.
       {
-        inherit sources check;
+        sources = sources gitFirst;
+        check = ''
+          expect_eq HEAD "$(git -C "$T"/x rev-parse HEAD)" ${gitFirst}
+          expect_eq commits "$(git -C "$T"/x rev-list --count HEAD)" 1
+          test ! -e "$T"/x/two || fail "two present"
+        '';
+      }
+      {
+        sources = sources gitHead;
+        inherit check;
         mutate = ''
           echo junk > "$T"/x/junk
           echo keepme > "$T"/x/keepme
         '';
       }
       {
-        inherit sources;
+        sources = sources gitHead;
         check = check + ''
           test ! -e "$T"/x/junk || fail "junk not cleaned"
           ${if flags.cleanExclude then ''