diff --git a/.github/workflows/poltergust.yaml b/.github/workflows/poltergust.yaml
index 521a521..23c1f10 100644
--- a/.github/workflows/poltergust.yaml
+++ b/.github/workflows/poltergust.yaml
@@ -7,7 +7,7 @@ on:
     branches: [ main ]
 
 jobs:
-  test:
+  build-and-test-valid-example:
     runs-on: ubuntu-latest
 
     steps:
@@ -20,5 +20,26 @@ jobs:
     - name: Install poltergust
       run: npm ci
 
-    - name: Run Poltergust tests
-      run: npx poltergust test ./example
\ No newline at end of file
+    - name: Test the example ruleset
+      run: npx poltergust test ./example
+
+  build-and-test-invalid-example:
+    needs: build-and-test-valid-example
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Use Node.js
+      uses: actions/setup-node@v2
+
+    - name: Install poltergust
+      run: npm ci
+
+    - name: Test the example ruleset
+      run: npx poltergust test ./example
+
+    - name: Test the invalid example ruleset (should exit 1)
+      run: npx poltergust test ./invalid-example || (exitcode=$?; [ $exitcode -eq 1 ] || exit $exitcode)
+      shell: bash
\ No newline at end of file
diff --git a/README.md b/README.md
index 9627362..ef84764 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![Run Poltergust Tests](https://github.com/ouvreboite/api-guidelines/actions/workflows/poltergust.yaml/badge.svg)](https://github.com/ouvreboite/api-guidelines/actions/workflows/poltergust.yaml)
+
 # 👻 poltergust
 
 An npm CLI to extract Spectral rules from .md files, merge them and test them.
diff --git a/example/parameters.md b/example/parameters.md
index b007016..abb56d6 100644
--- a/example/parameters.md
+++ b/example/parameters.md
@@ -59,7 +59,7 @@ paths:
   /mouses/{mice-id}: 
     get:
       parameters:
-        - name: mice-id #spectral-should-fail-here-❌: path-parameters-must-be-kebab-case
+        - name: mice-id #spectral-should-not-fail-here-✅: path-parameters-must-be-kebab-case
           in: path
           required: true
           schema:
diff --git a/functions.mjs b/functions.mjs
index b36b8b1..045170e 100644
--- a/functions.mjs
+++ b/functions.mjs
@@ -170,25 +170,28 @@ export function generateRuleFileContent(spectralRulesContents, rulesDir){
  * @return {boolean} success
  */
 export async function runTestCase(rule, testCase, rulesDir){
-    //write rule file to temp dir
-    const tempDir = await mkdtemp(rule.name+"-test-");
-    const tempRuleFilePath = path.join(tempDir, '.spectral.yaml');
-    const functionsDirPath = path.join(rulesDir, 'functions');
-    const tempFunctionsDirPath = path.join(tempDir, 'functions')
-    let ruleFile = generateRuleFileContent([rule.content], rulesDir);
-    fs.writeFileSync(tempRuleFilePath, ruleFile);
-
-    //copy the functions folder into the temp dir
-    fs.mkdirSync(tempFunctionsDirPath);
-    fs.readdirSync(functionsDirPath).forEach(file => {
-        const sourceFile = path.join(functionsDirPath, file);
-        const destFile = path.join(tempFunctionsDirPath, file);
-        fs.copyFileSync(sourceFile, destFile);
-    });
-
     let ok = true;
 
+    //write rule file to temp dir
+    const tempDir = await mkdtemp(rule.name+"-test-");
     try{
+        const tempRuleFilePath = path.join(tempDir, '.spectral.yaml');
+        let ruleFile = generateRuleFileContent([rule.content], rulesDir);
+        fs.writeFileSync(tempRuleFilePath, ruleFile);
+
+        //if the function dir exists, copy the functions folder into the temp dir
+        const functionsDirPath = path.join(rulesDir, 'functions');
+        if(fs.existsSync(functionsDirPath)){
+            const tempFunctionsDirPath = path.join(tempDir, 'functions')
+            fs.mkdirSync(tempFunctionsDirPath);
+            
+            fs.readdirSync(functionsDirPath).forEach(file => {
+                const sourceFile = path.join(functionsDirPath, file);
+                const destFile = path.join(tempFunctionsDirPath, file);
+                fs.copyFileSync(sourceFile, destFile);
+            });
+        }    
+
         //run test case against the rule
         const spectral = new Spectral();
         spectral.setRuleset(await bundleAndLoadRuleset(path.resolve(tempRuleFilePath), { fs, fetch }));
diff --git a/index.mjs b/index.mjs
index 1e8d41b..ed793aa 100644
--- a/index.mjs
+++ b/index.mjs
@@ -43,8 +43,9 @@ if (args[0] === 'merge') {
         }
         
         for(let testCase of testCases){
-            await runTestCase(rule, testCase, rulesDir);
+            const testCaseSuccess = await runTestCase(rule, testCase, rulesDir);
+            if(! testCaseSuccess)
+                process.exitCode = 1;
         }
     }
-    process.exit(1);
 }
\ No newline at end of file
diff --git a/invalid-example/invalid.md b/invalid-example/invalid.md
new file mode 100644
index 0000000..ec630f8
--- /dev/null
+++ b/invalid-example/invalid.md
@@ -0,0 +1,35 @@
+# API rules
+
+1. [base-path-must-start-with-slash](#base-path-must-start-with-slash)
+
+## base-path-must-start-with-slash
+
+```yaml
+#spectral-test
+#spectral-should-not-fail-anywhere-✅: base-path-must-start-with-slash
+openapi: 3.0.1
+info:
+  title: Test
+  version: 1.0.0
+servers:
+- url: do-not-start-with-slash #in fact, it should fail here
+```
+
+<details>
+  <summary>Spectral rule 🤖</summary>
+
+```yaml
+#spectral-rule
+base-path-must-start-with-slash:
+  description: Base path must start with /.
+  message: "{{description}}. But was {{value}}."
+  given: $.servers[*]
+  severity: error
+  then:
+    field: url
+    function: pattern
+    functionOptions:
+      match: "^\/"
+```
+
+</details>
\ No newline at end of file
diff --git a/invalid-example/spectral.base.yaml b/invalid-example/spectral.base.yaml
new file mode 100644
index 0000000..3dd9936
--- /dev/null
+++ b/invalid-example/spectral.base.yaml
@@ -0,0 +1,8 @@
+formats: ["oas3"]
+extends: "spectral:oas"
+aliases:
+  parameters: 
+    - $.paths[*].parameters
+    - $.paths[*][*].parameters
+#rules will be injected from the rules/*.md files
+rules:
\ No newline at end of file
diff --git a/invalid-example/spectral.yaml b/invalid-example/spectral.yaml
new file mode 100644
index 0000000..acb0f24
--- /dev/null
+++ b/invalid-example/spectral.yaml
@@ -0,0 +1,19 @@
+formats: ["oas3"]
+extends: "spectral:oas"
+aliases:
+  parameters: 
+    - $.paths[*].parameters
+    - $.paths[*][*].parameters
+#rules will be injected from the rules/*.md files
+rules:
+  base-path-must-start-with-slash:
+    description: Base path must start with /.
+    message: "{{description}}. But was {{value}}."
+    given: $.servers[*]
+    severity: error
+    then:
+      field: url
+      function: pattern
+      functionOptions:
+        match: "^\/"
+  
\ No newline at end of file