1. cover the code

.github/workflows/bun.yml

@@ -0,0 +1,38 @@
+name: Bun
+
+on:
+    push:
+
+jobs:
+    bun-coverage:
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v3
+
+            - name: Install Bun
+              run: |
+                  curl -fsSL https://bun.sh/install | bash
+                  echo "${HOME}/.bun/bin" >> $GITHUB_PATH
+
+            - name: Install Dependencies
+              working-directory: typescript-bun
+              run: bun install --backend copyfile
+
+            - name: Start and Seed MySQL Database
+              run: |
+                  sudo systemctl start mysql
+                  mysql -uroot -proot < database/initDatabase.sql
+
+            - name: Run Tests
+              working-directory: typescript-bun
+              env:
+                  DB_PASSWORD: root
+              run: bun test
+
+            - name: Check Coverage with Mutation Tests
+              working-directory: typescript-bun
+              env:
+                  DB_PASSWORD: root
+              run: bun stryker run

typescript-bun/.gitignore

@@ -1 +1,4 @@
 node_modules
+.stryker-tmp
+reports
+counter.json

typescript-bun/README.md

@@ -7,6 +7,12 @@
     bun install
     ```
 
+# Wait for mysql docker
+
+```shell
+(timeout 10 docker logs -f mariadb 2>&1 &) | grep -m 1 'ready for connections'
+```
+
 # Start the server
 
 ```shell
@@ -19,8 +25,14 @@ with different port (default is 3000)
 PORT=3001 bun --hot prices.ts
 ```
 
-# Run the (failing, e2e) test
+# Run the coverage e2e test
 
 ```shell
 bun test
 ```
+
+# Mutation Tests
+
+```shell
+bun stryker run
+```

typescript-bun/approvals.ts

@@ -0,0 +1,18 @@
+import { file, write } from "bun";
+import { expect } from "bun:test";
+import { EOL } from "os";
+
+export const approval = (baseName: string) => {
+    const things: any[] = [];
+
+    const str = () => things.map(String).join(EOL);
+    const approvedFile = () => file(`${baseName}.approved`);
+    const approvedText = async () =>
+        approvedFile().size == 0 ? "" : await approvedFile().text();
+
+    const add = (thing: any) => things.push(thing);
+    const update = () => write(approvedFile(), str());
+    const verify = async () => expect(str()).toEqual(await approvedText());
+
+    return { add, update, verify };
+};

typescript-bun/counter.ts

@@ -0,0 +1,19 @@
+import { file, write } from "bun";
+
+export const count = async () => {
+    const f = file("counter.json");
+
+    let _count = 0;
+
+    if (f.size > 0) {
+        const { count, updated } = await f.json();
+
+        if (Date.now() - 3000 < updated) {
+            _count = count + 1;
+        }
+    }
+
+    write(f, JSON.stringify({ count: _count, updated: Date.now() }));
+
+    return _count;
+};