plugins/barbar: add keymaps options + tests (#276)

tests/plugins/barbar.nix

@@ -0,0 +1,78 @@
+{
+  empty = {
+    plugins.barbar.enable = true;
+  };
+
+  keymappings = {
+    plugins.barbar = {
+      enable = true;
+
+      keymaps = {
+        silent = true;
+
+        next = "<TAB>";
+        previous = "<S-TAB>";
+        close = "<C-w>";
+      };
+    };
+  };
+
+  # All the upstream default options of barbar
+  defaults = {
+    plugins.barbar = {
+      animations = true;
+      autoHide = false;
+      tabpages = true;
+      closable = true;
+      clickable = true;
+      diagnostics = {
+        error = {
+          enable = false;
+          icon = "Ⓧ ";
+        };
+        warn = {
+          enable = false;
+          icon = "⚠️ ";
+        };
+        info = {
+          enable = false;
+          icon = "ⓘ ";
+        };
+        hint = {
+          enable = false;
+          icon = "💡";
+        };
+      };
+      excludeFileTypes = [];
+      excludeFileNames = [];
+      hide = {
+        extensions = false;
+        inactive = false;
+        alternate = false;
+        current = false;
+        visible = false;
+      };
+      highlightAlternate = false;
+      highlightInactiveFileIcons = false;
+      highlightVisible = true;
+      icons = {
+        enable = true;
+        customColors = false;
+        separatorActive = "▎";
+        separatorInactive = "▎";
+        separatorVisible = "▎";
+        closeTab = "";
+        closeTabModified = "●";
+        pinned = "車";
+      };
+      insertAtEnd = false;
+      insertAtStart = false;
+      maximumPadding = 4;
+      minimumPadding = 1;
+      maximumLength = 30;
+      semanticLetters = true;
+      letters = "asdfjkl;ghnmxcvbziowerutyqpASDFJKLGHNMXCVBZIOWERUTYQP";
+      noNameTitle = null;
+    };
+  };
+}