Jest + knex 'Unable to acquire a connection' during integration tests (sequelize works fine) - express

Question

I have both sequelize and knex in my project (node.js, express, using TypeScript). Just introduced knex as I don't like sequelize and just want a light-weight query builder.
In non-test environments both sequelize and knex work fine, however when running tests (using jest) knex is, apparently, not able to connect to the database. They both use the same databaseUrl, though sequelize has a few more options configured. When running my tests under jest I can't figure out why I am getting
Error: Unable to acquire a connection\n at
Client_PG.acquireConnection
When NODE_ENV is set to 'test', the express app uses a postgres database on my local machine.
Here is the configuration code
const _sqlz = new Sequelize(
config.dbConString,
{
logging: config.nodeEnv === 'test' ? false : false,
define: { freezeTableName: true },
dialect: 'postgres',
...config.sslDB === 'true'
? {
dialectOptions: {
ssl: {
require: true,
rejectUnauthorized: false
}
}
}
: {}
}
);
const knexConfig = {
client: 'postgres',
connection: config.dbConString,
pool: {
min: 0,
max: 15
}
};
const _knex = knex(knexConfig)
When running jest it will give me a Unable to acquire a connection when trying to execute a simple knex query like so
await _knex('myTable').select('*');
To figure out what's happening I configured things such that jest would use the same test database when I set my node environment to be development, i.e. NODE_ENV=development. Interestingly now that development and test point to the same local database, if I run jest, it still gives me the same error about not being able to acquire a connection. So me setting NODE_ENV=test in of itself is not the issue. If I run the app (npm run start) while pointing to my local database, knex works fine, which leads me to think something about jest + knex isn't meshing well. jest + sequelize is working fine.
I tried playing around with the SSL settings but to no avail (I did see some knex + heroku blog posts needing ssl to be explicitly set), e.g.:
const knexConfig = {
client: 'pg',
connection: {
connectionString: config.databaseUrl,
ssl: {
require: true,
rejectUnauthorized: false
}
},
pool: {
min: 0,
max: 15
}
};
Hoping someone with more experience might have some ideas.
Thanks