add basic tests for custom-commands

t/.jira.d/config.yml

@@ -3,3 +3,24 @@ config:
 password-source: pass
 endpoint: https://go-jira.atlassian.net
 user: gojira
+
+project: BASIC
+
+custom-commands:
+  - name: env
+    help: print the JIRA environment variables available to custom commands
+    script: |-
+      env | sort | grep JIRA
+  - name: print-project
+    help: print the name of the configured project
+    script: "echo $JIRA_PROJECT"
+  - name: mine
+    help: display issues assigned to me
+    script: |-
+      if [ -n "$JIRA_PROJECT" ]; then
+          # if `project: ...` configured just list the issues for current project
+          jira list --template table --query "resolution = unresolved and assignee=currentuser() and project = $JIRA_PROJECT ORDER BY priority asc, created"
+      else
+          # otherwise list issues for all project
+          jira list --template table --query "resolution = unresolved and assignee=currentuser() ORDER BY priority asc, created"
+      fi