adding SSBO unit test

test/ssbo.zig

@@ -0,0 +1,58 @@
+const std = @import("std");
+const root = @import("root.zig");
+const compileNzsl = root.compileNzsl;
+const case = root.case;
+
+test "Simple SSBO" {
+    const allocator = std.testing.allocator;
+    const shader =
+        \\ [nzsl_version("1.1")]
+        \\ module;
+        \\ 
+        \\ [layout(std430)]
+        \\ struct SSBO
+        \\ {
+        \\     data: dyn_array[u32]
+        \\ }
+        \\ 
+        \\ external
+        \\ {
+        \\     [set(0), binding(0)] ssbo: storage[SSBO],
+        \\ }
+        \\ 
+        \\ [entry(compute)]
+        \\ [workgroup(16, 1, 1)]
+        \\ fn main()
+        \\ {
+        \\     for i in 0 -> 256
+        \\     {
+        \\         ssbo.data[i] = u32(i);
+        \\     }
+        \\ }
+    ;
+    const code = try compileNzsl(allocator, shader);
+    defer allocator.free(code);
+
+    var expected = [_]u32{0} ** 256;
+    for (expected[0..], 0..) |*val, i| {
+        val.* = @intCast(i);
+    }
+
+    try case.expect(.{
+        .source = code,
+        .descriptor_sets = &.{
+            // Set 0
+            &.{
+                // Binding 0
+                std.mem.asBytes(&[_]u32{0} ** 256),
+            },
+        },
+        .expected_descriptor_sets = &.{
+            // Set 0
+            &.{
+                // Binding 0
+                std.mem.asBytes(&expected),
+            },
+        },
+    });
+}