add runner test + 'zig build test' subcommand

src/lang.zig

@@ -127,7 +127,6 @@ pub const Command = struct {
 pub const CommandList = std.ArrayList(*Command);
 pub const ArgList = std.ArrayList([]const u8);
 
-pub const PluginKeywords = [_]CommandType{ .Amp, .RFlanger };
 pub const KeywordMap = std.AutoHashMap([]const u8, CommandType);
 
 pub const Lang = struct {

src/main.zig

@@ -4,6 +4,7 @@ const runners = @import("runner.zig");
 
 test "scritcher" {
     _ = @import("lang.zig");
+    _ = @import("runner.zig");
 }
 
 pub fn main() !void {

src/runner.zig

@@ -469,3 +469,21 @@ pub const Runner = struct {
         }
     }
 };
+
+test "running noop" {
+    const allocator = std.heap.direct_allocator;
+    var cmds = lang.CommandList.init(allocator);
+    defer cmds.deinit();
+
+    var cmd_ptr = try allocator.create(lang.Command);
+    cmd_ptr.* = lang.Command{
+        .command = .Noop,
+        .args = lang.ArgList.init(allocator),
+    };
+    try cmds.append(cmd_ptr);
+
+    var runner = Runner.init(allocator);
+    defer runner.deinit();
+
+    try runner.runCommands(cmds, false);
+}