Add functional tests for package

Author: hssyoo

tests/functional/cloudformation/deploy_templates/long-double-quoted-scalar/input.yml

@@ -0,0 +1,15 @@
+AWSTemplateFormatVersion: '2010-09-09'
+Resources:
+  Config:
+    Type: AWS::SSM::Parameter
+    Properties:
+      Type: String
+      Value:
+        Fn::Sub:
+          - |
+            template: |
+              {{ define "test.message" }}
+              {{- $a := index .Alerts 0 -}}
+              {{- $queryExpr := reReplaceAll "\\]" "%5D" (reReplaceAll "\\[" "%5B" (reReplaceAll "=" "%3D" (reReplaceAll "\\}" "%7D" (reReplaceAll "\\{" "%7B" $a.Expr)))) }}
+              {{ end }}
+          - {}

tests/functional/cloudformation/deploy_templates/long-double-quoted-scalar/output.yml

@@ -0,0 +1,13 @@
+AWSTemplateFormatVersion: '2010-09-09'
+Resources:
+  Config:
+    Type: AWS::SSM::Parameter
+    Properties:
+      Type: String
+      Value:
+        Fn::Sub:
+        - "template: |\n  {{ define \"test.message\" }}\n  {{- $a := index .Alerts\
+          \ 0 -}}\n  {{- $queryExpr := reReplaceAll \"\\\\]\" \"%5D\" (reReplaceAll\
+          \ \"\\\\[\" \"%5B\" (reReplaceAll \"=\" \"%3D\" (reReplaceAll \"\\\\}\"\
+          \ \"%7D\" (reReplaceAll \"\\\\{\" \"%7B\" $a.Expr)))) }}\n  {{ end }}\n"
+        - {}