plugins/ledger: add tests

tests/test-sources/plugins/languages/ledger.nix

@@ -0,0 +1,43 @@
+{
+  empty = {
+    plugins.ledger.enable = true;
+  };
+
+  defaults = {
+    plugins.ledger = {
+      enable = true;
+
+      settings = {
+        bin = null;
+        is_hledger = null;
+        extra_options = "";
+        accounts_cmd = null;
+        descriptions_cmd = null;
+        maxwidth = 0;
+        fillstring = " ";
+        detailed_first = true;
+        fold_blanks = false;
+        decimal_sep = ".";
+        align_last = false;
+        align_at = 60;
+        default_commodity = "";
+        align_commodity = false;
+        commodity_before = true;
+        commodity_sep = "";
+        commodity_spell = false;
+        date_format = "%Y/%m/%d";
+        main = "%";
+        winpos = "B";
+        qf_register_format = null;
+        qf_reconcile_format = null;
+        use_location_list = false;
+        qf_vertical = false;
+        qf_size = 10;
+        qf_hide_file = true;
+        cleared_string = "Cleared: ";
+        pending_string = "Cleared or pending: ";
+        target_string = "Difference from target: ";
+      };
+    };
+  };
+}