add first evaluations tests

tests/jobs/basic.nix

@@ -0,0 +1,23 @@
+{ input }:
+{  
+  empty_dir = 
+    derivation {
+      name = "empty-dir";
+      system = builtins.currentSystem;
+      builder = ./empty-dir-builder.sh;
+    };
+
+  fails = 
+    derivation {
+      name = "fails";
+      system = builtins.currentSystem;
+      builder = ./fail.sh;
+    };
+
+  succeed_with_failed = 
+    derivation {
+      name = "succeed-with-failed";
+      system = builtins.currentSystem;
+      builder = ./succeed-with-failed.sh;
+    };
+}