knex/test/unit/dialects/postgres.js

const knex = require('../../../knex');
const expect = require('chai').expect;

describe('Postgres Unit Tests', function() {
  it('Validates searchPath as Array/String', function() {
    const knexInstance = knex({
      client: 'pg',
    });

    expect(function() {
      knexInstance.client.setSchemaSearchPath(null, {});
    }).to.throw(TypeError);

    expect(function() {
      knexInstance.client.setSchemaSearchPath(null, 4);
    }).to.throw(TypeError);

    const fakeQueryFn = function(expectedSearchPath) {
      return {
        query: function(sql, callback) {
          try {
            expect(sql).to.equal('set search_path to ' + expectedSearchPath);
            callback(null);
          } catch (error) {
            callback(error);
          }
        },
      };
    };

    return knexInstance.client
      .setSchemaSearchPath(fakeQueryFn('"public,knex"'), 'public,knex')
      .then(function() {
        return knexInstance.client.setSchemaSearchPath(
          fakeQueryFn('"public","knex"'),
          ['public', 'knex']
        );
      })
      .then(function() {
        return knexInstance.client.setSchemaSearchPath(
          fakeQueryFn('"public"'),
          'public'
        );
      });
  });
});