[VM] Added a unit test for window_msg.

src/quest_editor/scripting/vm/index.test.ts

@@ -0,0 +1,59 @@
+import { VirtualMachine, ExecutionResult } from ".";
+import { VMIOStub } from "./VMIOStub";
+import { to_instructions } from "../../../../test/src/utils";
+
+test("basic window_msg output", () => {
+    const messages = ["foo", "bar", "buz"];
+    const segments = to_instructions(`
+        .code
+        0:
+            arg_pushs "${messages[0]}"
+            window_msg
+            arg_pushs "${messages[1]}"
+            add_msg
+            arg_pushs "${messages[2]}"
+            add_msg
+            winend
+    `, true);
+
+    class TestIO extends VMIOStub {
+        window_msg = jest.fn((msg: string) => {
+            expect(msg).toBe(messages.shift());
+        });
+
+        add_msg = jest.fn((msg: string) => {
+            expect(msg).toBe(messages.shift());
+        });
+
+        winend = jest.fn(() => {});
+
+        error = jest.fn((msg: string, loc: any) => {
+            throw msg;
+        });
+    }
+
+    const io = new TestIO();
+    const vm = new VirtualMachine(io);
+
+    vm.load_object_code(segments);
+    vm.start_thread(0);
+
+    const exec_results: ExecutionResult[] = [];
+    let last_result: ExecutionResult;
+    do {
+        last_result = vm.execute();
+        exec_results.push(last_result);
+    } while (last_result !== ExecutionResult.Halted);
+
+    expect(exec_results).toHaveLength(segments[0].instructions.length);
+    expect(exec_results).toEqual(
+        Array(segments[0].instructions.length - 1)
+            .fill(ExecutionResult.Ok)
+            .concat(ExecutionResult.Halted),
+    );
+
+    expect(io.window_msg).toBeCalledTimes(1);
+    expect(io.add_msg).toBeCalledTimes(2);
+    expect(io.winend).toBeCalledTimes(1);
+    expect(io.error).toBeCalledTimes(0);
+});