Commit missing test files

ofborg/test-srcs/eval-mixed-failure/default.nix

@@ -0,0 +1,34 @@
+let
+  nix = import <nix/config.nix>;
+in rec {
+  success = derivation {
+    name = "success";
+    system = builtins.currentSystem;
+    builder = nix.shell;
+    args = [
+      "-c"
+      "echo hi; echo ${toString builtins.currentTime} > $out" ];
+  };
+
+  failed = derivation {
+    name = "failed";
+    system = builtins.currentSystem;
+    builder = nix.shell;
+    args = [
+      "-c"
+      "echo hi; echo ${toString builtins.currentTime}; echo ${success}" ];
+  };
+
+  passes-instantiation = derivation {
+    name = "passes-instantiation";
+    system = builtins.currentSystem;
+    builder = nix.shell;
+    args = [
+      "-c"
+      "echo this ones cool" ];
+  };
+
+  fails-instantiation = assert builtins.trace ''
+    You just can't frooble the frozz on this particular system.
+  '' false; {};
+}