test: 拆分 VM 测试并新增多项测试

crates/oxide_vm/tests/regression_tests.rs

@@ -0,0 +1,39 @@
+use oxide_compiler::compiler::Compiler;
+use oxide_parser::Allocator;
+use oxide_vm::vm::Vm;
+
+fn eval(source: &str) -> String {
+    let allocator = Allocator::default();
+    let program = match oxide_parser::parse(&allocator, source) {
+        Ok(p) => p,
+        Err(e) => return format!("parse error: {}", e[0].message),
+    };
+    let module = match Compiler::new().compile(&program) {
+        Ok(m) => m,
+        Err(e) => return format!("compile error: {e}"),
+    };
+    let mut vm = Vm::new();
+    match vm.run(&module) {
+        Ok(result) => format!("{result}"),
+        Err(e) => format!("vm error: {e}"),
+    }
+}
+
+#[test]
+fn regression_to_boolean_empty_string() {
+    assert_eq!(eval("!''"), "true", "NOT empty string should be true");
+    assert_eq!(
+        eval("if ('') { 1 } else { 2 }"),
+        "2",
+        "empty string should be falsy"
+    );
+}
+
+#[test]
+fn regression_continue_in_for() {
+    assert_eq!(
+        eval("var r=0; for(i=0;i<3;i=i+1){if(i==1)continue;r=r+i;}r"),
+        "2",
+        "continue should skip iteration body"
+    );
+}