diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 6ffb4a5..0c21ebc 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -109,6 +109,30 @@ jobs:
             echo "Expected output '1 breaking changes: 1 error, 0 warning' but got '${output}'" >&2
             exit 1
           fi
+  oasdiff_breaking_matching_delimiter_not_found:
+      runs-on: ubuntu-latest
+      name: Test breaking action with petsotre to validate no error of unable to process file command 'output' successfully and invalid value and matching delimiter not found
+      steps:
+        - name: checkout
+          uses: actions/checkout@v4
+        - name: Running breaking action with petsotre to validate no error of unable to process file command 'output' successfully and invalid value and matching delimiter not found
+          id: test_breaking_changes_matching_delimiter_not_found
+          uses: ./breaking
+          with:
+            base: 'specs/petstore-base.yaml'
+            revision: 'specs/petstore-revision.yaml'
+            fail-on-diff: false
+        - name: Test breaking changes action output
+          run: |
+            delimiter=$(cat /proc/sys/kernel/random/uuid | tr -d '-')
+            output=$(cat <<-$delimiter
+            ${{ steps.test_breaking_changes_matching_delimiter_not_found.outputs.breaking }}
+            $delimiter
+            )
+            if [ "$output" != "9 breaking changes: 6 error, 3 warning" ]; then
+              echo "Expected output '9 breaking changes: 6 error, 3 warning' but got '$output'" >&2
+              exit 1
+            fi
   oasdiff_breaking_composed:
     runs-on: ubuntu-latest
     name: Test breaking action with composed option
diff --git a/breaking/action.yml b/breaking/action.yml
index 8238bd9..d0b8e29 100644
--- a/breaking/action.yml
+++ b/breaking/action.yml
@@ -52,4 +52,4 @@ runs:
     - ${{ inputs.deprecation-days-stable }}
     - ${{ inputs.exclude-elements }}
     - ${{ inputs.composed }}
-    - ${{ inputs.output-to-file }}
+    - ${{ inputs.output-to-file }}
\ No newline at end of file
diff --git a/breaking/entrypoint.sh b/breaking/entrypoint.sh
index e5d885d..e52050c 100755
--- a/breaking/entrypoint.sh
+++ b/breaking/entrypoint.sh
@@ -1,25 +1,6 @@
 #!/bin/sh
 set -e
 
-write_output () {
-    local output="$1"
-    if [ -n "$output_to_file" ]; then
-        local file_output="$2"
-        if [ -z "$file_output" ]; then
-            file_output=$output
-        fi
-        echo "$file_output" >> "$output_to_file"
-    fi
-    # github-action limits output to 1MB
-    # we count bytes because unicode has multibyte characters
-    size=$(echo "$output" | wc -c)
-    if [ "$size" -ge "1000000" ]; then
-        echo "WARN: diff exceeds the 1MB limit, truncating output..." >&2
-        output=$(echo "$output" | head -c 1000000)
-    fi
-    echo "$output" >>"$GITHUB_OUTPUT"
-}
-
 readonly base="$1"
 readonly revision="$2"
 readonly fail_on_diff="$3"
@@ -31,6 +12,26 @@ readonly exclude_elements="$8"
 readonly composed="$9"
 readonly output_to_file="${10}"
 
+write_output () {
+    _write_output_output="$1"
+    if [ -n "$output_to_file" ]; then
+        _write_output_file_output="$2"
+        if [ -z "$_write_output_file_output" ]; then
+            _write_output_file_output=$_write_output_output
+
+        fi
+        echo "$_write_output_file_output" >> "$output_to_file"
+    fi
+    # github-action limits output to 1MB
+    # we count bytes because unicode has multibyte characters
+    size=$(echo "$_write_output_output" | wc -c)
+    if [ "$size" -ge "1000000" ]; then
+        echo "WARN: diff exceeds the 1MB limit, truncating output..." >&2
+        _write_output_output=$(echo "$_write_output_output" | head -c 1000000)
+    fi
+    echo "$_write_output_output" >>"$GITHUB_OUTPUT"
+}
+
 echo "running oasdiff breaking... base: $base, revision: $revision, fail_on_diff: $fail_on_diff, include_checks: $include_checks, include_path_params: $include_path_params, deprecation_days_beta: $deprecation_days_beta, deprecation_days_stable: $deprecation_days_stable, exclude_elements: $exclude_elements, composed: $composed, output_to_file: $output_to_file"
 
 # Build flags to pass in command
@@ -58,9 +59,21 @@ if [ "$composed" = "true" ]; then
 fi
 echo "flags: $flags"
 
-# *** github action step output ***
+# Check for breaking changes
+if [ -n "$flags" ]; then
+    breaking_changes=$(oasdiff breaking "$base" "$revision" $flags)
+else
+    breaking_changes=$(oasdiff breaking "$base" "$revision")
+fi
+
+# Updating GitHub Action summary with formatted output
+flags_with_githubactions="$flags --format githubactions"
+# Writes the summary to log and updates GitHub Action summary
+oasdiff breaking "$base" "$revision" $flags_with_githubactions
 
-# output name should be in the syntax of multiple lines:
+# *** GitHub Action step output ***
+
+# Output name should be in the syntax of multiple lines:
 # {name}<<{delimiter}
 # {value}
 # {delimiter}
@@ -68,23 +81,10 @@ echo "flags: $flags"
 delimiter=$(cat /proc/sys/kernel/random/uuid | tr -d '-')
 echo "breaking<<$delimiter" >>"$GITHUB_OUTPUT"
 
-if [ -n "$flags" ]; then
-    output=$(oasdiff breaking "$base" "$revision" $flags)
-else
-    output=$(oasdiff breaking "$base" "$revision")
-fi
-
-if [ -n "$output" ]; then
-    write_output "$(echo "$output" | head -n 1)" "$output"
+if [ -n "$breaking_changes" ]; then
+    write_output "$(echo "$breaking_changes" | head -n 1)" "$breaking_changes"
 else
     write_output "No breaking changes"
 fi
 
 echo "$delimiter" >>"$GITHUB_OUTPUT"
-
-# *** github action step output ***
-
-# Updating GitHub Action summary with formatted output
-flags="$flags --format githubactions"
-# Writes the summary to log and updates GitHub Action summary
-oasdiff breaking "$base" "$revision" $flags
diff --git a/specs/petstore-base.yaml b/specs/petstore-base.yaml
new file mode 100644
index 0000000..7ed987f
--- /dev/null
+++ b/specs/petstore-base.yaml
@@ -0,0 +1,119 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  license:
+    name: MIT
+servers:
+  - url: http://petstore.swagger.io/v1
+paths:
+  /pets:
+    get:
+      summary: List all pets
+      operationId: listPets
+      tags:
+        - pets
+      parameters:
+        - name: limit
+          in: query
+          description: How many items to return at one time (max 100)
+          required: false
+          schema:
+            type: integer
+            maximum: 100
+            format: int32
+      responses:
+        '200':
+          description: A paged array of pets
+          headers:
+            x-next:
+              description: A link to the next page of responses
+              schema:
+                type: string
+          content:
+            application/json:    
+              schema:
+                $ref: "#/components/schemas/Pets"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+    post:
+      summary: Create a pet
+      operationId: createPets
+      tags:
+        - pets
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Pet'
+        required: true
+      responses:
+        '201':
+          description: Null response
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+  /pets/{petId}:
+    get:
+      summary: Info for a specific pet
+      operationId: showPetById
+      tags:
+        - pets
+      parameters:
+        - name: petId
+          in: path
+          required: true
+          description: The id of the pet to retrieve
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pet"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+components:
+  schemas:
+    Pet:
+      type: object
+      required:
+        - id
+        - name
+      properties:
+        id:
+          type: integer
+          format: int64
+        name:
+          type: string
+        tag:
+          type: string
+    Pets:
+      type: array
+      maxItems: 100
+      items:
+        $ref: "#/components/schemas/Pet"
+    Error:
+      type: object
+      required:
+        - code
+        - message
+      properties:
+        code:
+          type: integer
+          format: int32
+        message:
+          type: string
diff --git a/specs/petstore-revision.yaml b/specs/petstore-revision.yaml
new file mode 100644
index 0000000..1409f20
--- /dev/null
+++ b/specs/petstore-revision.yaml
@@ -0,0 +1,118 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  license:
+    name: MIT
+servers:
+  - url: http://petstore.swagger.io/v1
+paths:
+  /pets:
+    get:
+      summary: List all pets
+      operationId: listPets
+      tags:
+        - pets
+      parameters:
+        - name: limit
+          in: query
+          description: How many items to return at one time (max 100)
+          required: false
+          schema:
+            type: integer
+            maximum: 100
+            format: int32
+      responses:
+        '200':
+          description: A paged array of pets
+          headers:
+            x-next:
+              description: A link to the next page of responses
+              schema:
+                type: string
+          content:
+            application/json:    
+              schema:
+                $ref: "#/components/schemas/Pets"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+    post:
+      summary: Create a pet
+      operationId: createPets
+      tags:
+        - pets
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Pet'
+        required: true
+      responses:
+        '201':
+          description: Null response
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+  /pets/{petId}:
+    get:
+      summary: Info for a specific pet
+      operationId: showPetById
+      tags:
+        - pets
+      parameters:
+        - name: petId
+          in: path
+          required: true
+          description: The id of the pet to retrieve
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pet"
+        default:
+          description: unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+components:
+  schemas:
+    Pet:
+      type: object
+      required:
+        - id
+        - tag2
+      properties:
+        id:
+          type: integer
+          format: int64
+        name:
+          type: string
+        tag2:
+          type: string
+    Pets:
+      type: array
+      maxItems: 100
+      items:
+        $ref: "#/components/schemas/Pet"
+    Error:
+      type: object
+      required:
+        - code
+      properties:
+        code:
+          type: integer
+          format: int32
+        message:
+          type: string