updating an example pipelinerun with array indexing

Validating the expected param values while indexing into an array when task
array params mapped to a pipeline array params and task string params are
an elements of a pipeline array param

Signed-off-by: pritidesai <pdesai@us.ibm.com>

examples/v1beta1/pipelineruns/alpha/pipelinerun-param-array-indexing.yaml

@@ -13,40 +13,86 @@ spec:
           value: '$(params.environments[0])'
         - name: environment2
           value: '$(params.environments[1])'
+        - name: environments
+          value: '$(params.environments[*])'
       taskSpec:
         params:
           - name: environment1
             type: string
           - name: environment2
             type: string
+          - name: environments
+            type: array
         steps:
-          # this step should echo "staging"
-          - name: echo-params-1
-            image: bash:3.2
+          # args must be initialed to "staging"
+          - name: validate-environment1
+            image: bash:latest
             args: [
-              "echo",
               "$(params.environment1)",
             ]
-          # this step should echo "staging"
-          - name: echo-params-2
+            script: |
+              if [[ $# != 1 ]]; then
+                echo "failed to validate the length of the arguments"
+                echo "Want: 1, Got: $#"
+                exit 1
+              fi
+              if [[ $1 != "staging" ]]; then
+                  echo "failed to validate the one and only argument of the script"
+                  echo "Want: staging, Got: $1"
+                exit 1
+              fi
+              if [[ $(params.environments[2]) != "prod" ]]; then
+                echo "failed to validate indexing into an array param"
+                echo "Want: prod, Got: $(params.environments[2])"
+              fi
+          # this step validates string param which must be set to an array element - qa
+          - name: validate-environment2
             image: ubuntu
             script: |
               #!/bin/bash
               VALUE=$(params.environment2)
               EXPECTED="qa"
               diff=$(diff <(printf "%s\n" "${VALUE[@]}") <(printf "%s\n" "${EXPECTED[@]}"))
               if [[ -z "$diff" ]]; then
-                  echo "Get expected: ${VALUE}"
+                  echo "Got expected: ${VALUE}"
                   exit 0
               else
                   echo "Want: ${EXPECTED} Got: ${VALUE}"
                   exit 1
               fi
+          # this step validates an array param which must have three values
+          # also validates indexing into an array param
+          - name: validate-environments
+            image: bash:latest
+            args: [
+              "$(params.environments[*])",
+            ]
+            script: |
+              if [[ $# != 3 ]]; then
+                echo "failed to validate the length of the arguments"
+                echo "Want: 3, Got: $#"
+                exit 1
+              fi
+              if [[ $(params.environments[0]) != "staging" ]]; then
+                  echo "failed to validate the first array element while indexing into an array"
+                  echo "Want: staging, Got: $(params.environments[0])"
+                exit 1
+              fi
+              if [[ $(params.environments[1]) != "qa" ]]; then
+                  echo "failed to validate the second array element while indexing into an array"
+                  echo "Want: qa, Got: $(params.environments[1])"
+                exit 1
+              fi
+              if [[ $(params.environments[2]) != "prod" ]]; then
+                echo "failed to validate the third array element while indexing into an array"
+                echo "Want: prod, Got: $(params.environments[2])"
+              fi
+
 ---
 apiVersion: tekton.dev/v1beta1
 kind: PipelineRun
 metadata:
-  name: deployrun
+  generateName: pipelinerun-param-array-indexing-
 spec:
   pipelineRef:
     name: deploy