Collect the coverage report for npm test jobs

The npm test run can optionally create an html coverage report.
This change causes the post job to check if the directory exists,
and if so also collect the coverage report with the npm logs.

Change-Id: I7cc50c352c3feeed283888cbe7f02c6b1264b7b0

roles/fetch-javascript-output/defaults/main.yaml

@@ -1,3 +1,4 @@
 zuul_work_dir: "{{ zuul.project.src_dir }}"
 javascript_content_dir: dist
 javascript_copy_links: true
+coverage_output_src: "{{ zuul_work_dir }}/cover/"

roles/fetch-javascript-output/tasks/main.yaml

@@ -1,11 +1,13 @@
 - name: Set log path for multiple nodes
   set_fact:
     log_path: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}/npm"
+    cover_path: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}/cover/"
   when: groups['all'] | length > 1
 
 - name: Set log path for single node
   set_fact:
     log_path: "{{ zuul.executor.log_root }}/npm"
+    cover_path: "{{ zuul.executor.log_root }}/cover/"
   when: log_path is not defined
 
 - name: Ensure local tox dir
@@ -118,3 +120,23 @@
     copy_links: "{{ javascript_copy_links }}"
     verify_host: true
   when: javascript_output.stat.exists
+
+- name: Check to see if coverage report exists
+  stat:
+    path: "{{ coverage_output_src }}"
+  register: coverage_report_stat
+
+- name: Ensure cover tox dir
+  file:
+    path: "{{ cover_path }}"
+    state: directory
+  delegate_to: localhost
+  when: coverage_report_stat.stat.exists
+
+- name: Collect coverage details output
+  synchronize:
+    dest: "{{ cover_path }}"
+    mode: pull
+    src: "{{ coverage_output_src }}"
+    verify_host: true
+  when: coverage_report_stat.stat.exists