Add testing for wasm VM

Signed-off-by: luccie-cmd <luccie@sideros.org>

src/mods/mods.zig

@@ -6,3 +6,42 @@ pub const IR = @import("ir.zig");
 
 pub const GlobalRuntime = Wasm.GlobalRuntime;
 pub const Runtime = VM.Runtime;
+
+const std = @import("std");
+
+test "Fibonacci" {
+    // var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    // const allocator = gpa.allocator();
+    const allocator = std.testing.allocator;
+    var global_runtime = GlobalRuntime.init(allocator);
+    defer global_runtime.deinit();
+
+    const file = try std.fs.cwd().openFile("assets/core.wasm", .{});
+    const all = try file.readToEndAlloc(allocator, 1_000_000); // 1 MB
+    var parser = Parser{
+        .bytes = all,
+        .byte_idx = 0,
+        .allocator = allocator,
+    };
+    const module = parser.parseModule() catch |err| {
+        std.debug.print("[ERROR]: error at byte {x}(0x{x})\n", .{ parser.byte_idx, parser.bytes[parser.byte_idx] });
+        return err;
+    };
+    var runtime = try Runtime.init(allocator, module, &global_runtime);
+    defer runtime.deinit(allocator);
+
+    var parameters = [_]usize{17};
+    try runtime.callExternal(allocator, "preinit", &parameters);
+    const result = runtime.stack.pop().?;
+    try std.testing.expect(result.i64 == 1597);
+
+    var parameters2 = [_]usize{1};
+    try runtime.callExternal(allocator, "preinit", &parameters2);
+    const result2 = runtime.stack.pop().?;
+    try std.testing.expect(result2.i64 == 1);
+
+    var parameters3 = [_]usize{5};
+    try runtime.callExternal(allocator, "preinit", &parameters3);
+    const result3 = runtime.stack.pop().?;
+    try std.testing.expect(result3.i64 == 5);
+}