Configure test file sorter to place specific files earlier

vitest.config.ts

@@ -1,11 +1,51 @@
 import { defineProject } from "vitest/config";
 import { defaultConfig } from "./vite.config";
+import { BaseSequencer } from "vitest/node";
+
+/**
+ * A helper function for sorting test files in a desired order.
+ *
+ * A lower number means that a test file must be run earlier,
+ * or else it breaks due to running tests with `--no-isolate.`
+ */
+function getTestOrder(testName: string): number {
+  if (testName.includes("battle_scene.test.ts")) {
+    return 1;
+  } else if (testName.includes("inputs.test.ts")) {
+    return 2;
+  } else {
+    return 3;
+  }
+}
 
 export default defineProject(({ mode }) => ({
   ...defaultConfig,
   test: {
     testTimeout: 20000,
     setupFiles: ["./test/fontFace.setup.ts", "./test/vitest.setup.ts"],
+    server: {
+      deps: {
+        inline: ["vitest-canvas-mock"],
+        optimizer: {
+          web: {
+            include: ["vitest-canvas-mock"],
+          },
+        },
+      },
+    },
+    sequence: {
+      sequencer: class Seqencer extends BaseSequencer {
+        async sort(files: [any, string][]) {
+          files = await super.sort(files);
+
+          // Sort files so that `inputs.test.ts` gets run first; otherwise, `inputs.test.ts` randomly breaks
+          return files.sort((a, b) => {
+            return getTestOrder(a[1]) - getTestOrder(b[1]);
+            b;
+          });
+        }
+      },
+    },
     environment: "jsdom" as const,
     environmentOptions: {
       jsdom: {