test(utils): use file snapshots for Markdown and stdout text

.prettierignore

@@ -1,4 +1,5 @@
 # Add files here to ignore them from prettier formatting
 /dist
 /coverage
-/.nx/cache
+/.nx/cache
+__snapshots__

packages/utils/src/lib/reports/__snapshots__/report-diff-improved.md

@@ -0,0 +1,48 @@
+# Code PushUp
+
+🙌 Code PushUp report has **improved** – compared target commit `0123456` with source commit `abcdef0`.
+
+## 🏷️ Categories
+
+|🏷️ Category|⭐ Current score|⭐ Previous score|🗠 Score change|
+|:--|:--:|:--:|:--:|
+|Performance|🟢 **94**|🟢 92|<span style="color: green">▲ **+2**</span>|
+|Bug prevention|🟢 **95**|🟡 68|<span style="color: green">▲ **+27**</span>|
+|Code style|🟢 **100**|🟡 54|<span style="color: green">▲ **+46**</span>|
+
+## 🎗️ Groups
+
+<details>
+<summary>👍 <strong>2</strong> groups improved</summary>
+
+|🔌 Plugin|🎗️ Group|⭐ Current score|⭐ Previous score|🗠 Score change|
+|:--|:--|:--:|:--:|:--:|
+|ESLint|Maximum lines limitation|🟢 **100**|🟡 50|<span style="color: green">▲ **+50**</span>|
+|Lighthouse|Performance|🟢 **94**|🟢 92|<span style="color: green">▲ **+2**</span>|
+
+</details>
+
+
+## 🛡️ Audits
+
+<details>
+<summary>👍 <strong>12</strong> audits improved</summary>
+
+|🔌 Plugin|🛡️ Audit|📏 Current value|📏 Previous value|🗠 Value change|
+|:--|:--|:--:|:--:|:--:|
+|ESLint|Disallow unused variables|🟩 **passed**|🟥 1 warning|<span style="color: green">▼ **-100%**</span>|
+|ESLint|Require braces around arrow function bodies|🟩 **passed**|🟥 1 warning|<span style="color: green">▼ **-100%**</span>|
+|ESLint|Require the use of `===` and `!==`|🟩 **passed**|🟥 1 warning|<span style="color: green">▼ **-100%**</span>|
+|ESLint|Enforce a maximum number of lines of code in a function|🟩 **passed**|🟥 1 warning|<span style="color: green">▼ **-100%**</span>|
+|ESLint|Disallow variable declarations from shadowing variables declared in the outer scope|🟩 **passed**|🟥 3 warnings|<span style="color: green">▼ **-100%**</span>|
+|ESLint|Require or disallow method and property shorthand syntax for object literals|🟩 **passed**|🟥 3 warnings|<span style="color: green">▼ **-100%**</span>|
+|ESLint|Require `const` declarations for variables that are never reassigned after declared|🟩 **passed**|🟥 1 warning|<span style="color: green">▼ **-100%**</span>|
+|ESLint|Disallow missing `key` props in iterators/collection literals|🟩 **passed**|🟥 1 warning|<span style="color: green">▼ **-100%**</span>|
+|ESLint|verifies the list of dependencies for Hooks like useEffect and similar|🟩 **passed**|🟥 2 warnings|<span style="color: green">▼ **-100%**</span>|
+|Lighthouse|First Contentful Paint|🟨 **1.1 s**|🟨 1.2 s|<span style="color: green">▼ **-4%**</span>|
+|Lighthouse|Largest Contentful Paint|🟨 **1.4 s**|🟨 1.5 s|<span style="color: green">▼ **-8%**</span>|
+|Lighthouse|Speed Index|🟩 **1.1 s**|🟩 1.2 s|<span style="color: green">▼ **-4%**</span>|
+
+40 other audits are unchanged.
+
+</details>

packages/utils/src/lib/reports/__snapshots__/report-diff-mixed.md

@@ -0,0 +1,48 @@
+# Code PushUp
+
+😐 Code PushUp report has both **improved and regressed** – compared target commit `0123456` with source commit `abcdef0`.
+
+## 🏷️ Categories
+
+|🏷️ Category|⭐ Current score|⭐ Previous score|🗠 Score change|
+|:--|:--:|:--:|:--:|
+|Performance|🟢 **94**|🟢 92|<span style="color: green">▲ **+2**</span>|
+|Bug prevention|🟡 **63**|🟡 68|<span style="color: red">▼ **-5**</span>|
+
+<details>
+<summary>1 other category is unchanged.</summary>
+
+- Code style: 🟡 **54**
+
+</details>
+
+
+## 🎗️ Groups
+
+<details>
+<summary>👍 <strong>1</strong> group improved</summary>
+
+|🔌 Plugin|🎗️ Group|⭐ Current score|⭐ Previous score|🗠 Score change|
+|:--|:--|:--:|:--:|:--:|
+|Lighthouse|Performance|🟢 **94**|🟢 92|<span style="color: green">▲ **+2**</span>|
+
+1 other group is unchanged.
+
+</details>
+
+
+## 🛡️ Audits
+
+<details>
+<summary>👍 <strong>3</strong> audits improved, 👎 <strong>1</strong> audit regressed</summary>
+
+|🔌 Plugin|🛡️ Audit|📏 Current value|📏 Previous value|🗠 Value change|
+|:--|:--|:--:|:--:|:--:|
+|ESLint|Disallow unused variables|🟥 **1 error**|🟩 passed|<span style="color: red">▲ **+∞%**</span>|
+|Lighthouse|First Contentful Paint|🟨 **1.1 s**|🟨 1.2 s|<span style="color: green">▼ **-4%**</span>|
+|Lighthouse|Largest Contentful Paint|🟨 **1.4 s**|🟨 1.5 s|<span style="color: green">▼ **-8%**</span>|
+|Lighthouse|Speed Index|🟩 **1.1 s**|🟩 1.2 s|<span style="color: green">▼ **-4%**</span>|
+
+48 other audits are unchanged.
+
+</details>