Some tests rely on the presence of a server that serves PDF files.
When tests are run from a web browser, the test files and PDF files are
served by the same server (WebServer), but in Node.js that server is not
around.
Currently, the tests that depend on it start a minimal Node.js server
that re-implements part of the functionality from WebServer.
To avoid code duplication when tests depend on more complex behaviors,
this patch replaces createTemporaryNodeServer with the existing
WebServer, wrapped in a new test utility that has the same interface in
Node.js and non-Node.js environments (=TestPdfsServer).
This patch has been tested by running the refactored tests in the
following three configurations:
1. From the browser:
- http://localhost:8888/test/unit/unit_test.html?spec=api
- http://localhost:8888/test/unit/unit_test.html?spec=fetch_stream
2. Run specific tests directly with jasmine without legacy bundling:
`JASMINE_CONFIG_PATH=test/unit/clitests.json ./node_modules/.bin/jasmine --filter='^api|^fetch_stream'`
3. `gulp unittestcli`
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