Fix/testy rejections

[cds-amal]

This PR fixes two tests that didn't account for unhandled promise rejections. I found this when a build failed and flagged these tests for failing CI

2021-06-16T18:00:09.1609218Z @truffle/core: UnhandledRejections detected
2021-06-16T18:00:09.1626964Z @truffle/core: Promise {
2021-06-16T18:00:09.1628102Z @truffle/core:   <rejected> ExtendableError: Could not find suitable configuration file.
2021-06-16T18:00:09.1629778Z @truffle/core:       at Function.detect (/home/runner/work/truffle/truffle/packages/config/src/index.ts:185:13)
2021-06-16T18:00:09.1631596Z @truffle/core:       at Object.run (/home/runner/work/truffle/truffle/packages/core/lib/commands/migrate.js:194:25)
2021-06-16T18:00:09.1633948Z @truffle/core:       at Command.run (/home/runner/work/truffle/truffle/packages/core/lib/command.js:167:33)
2021-06-16T18:00:09.1635235Z @truffle/core:       at Context.<anonymous> (/home/runner/work/truffle/truffle/packages/core/test/commands.js:52:15)
2021-06-16T18:00:09.1636611Z @truffle/core:       at callFn (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runnable.js:358:21)
2021-06-16T18:00:09.1638602Z @truffle/core:       at Test.Runnable.run (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runnable.js:346:5)
2021-06-16T18:00:09.1640194Z @truffle/core:       at Runner.runTest (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:621:10)
2021-06-16T18:00:09.1641587Z @truffle/core:       at /home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:745:12
2021-06-16T18:00:09.1642861Z @truffle/core:       at next (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:538:14)
2021-06-16T18:00:09.1643944Z @truffle/core:       at /home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:548:7
2021-06-16T18:00:09.1645023Z @truffle/core:       at next (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:430:14)
2021-06-16T18:00:09.1646245Z @truffle/core:       at Immediate.<anonymous> (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:516:5)
2021-06-16T18:00:09.1647317Z @truffle/core:       at processImmediate (internal/timers.js:462:21)
2021-06-16T18:00:09.1648312Z @truffle/core: } ExtendableError: Could not find suitable configuration file.
2021-06-16T18:00:09.1649892Z @truffle/core:     at Function.detect (/home/runner/work/truffle/truffle/packages/config/src/index.ts:185:13)
2021-06-16T18:00:09.1651227Z @truffle/core:     at Object.run (/home/runner/work/truffle/truffle/packages/core/lib/commands/migrate.js:194:25)
2021-06-16T18:00:09.1654304Z @truffle/core:     at Command.run (/home/runner/work/truffle/truffle/packages/core/lib/command.js:167:33)
2021-06-16T18:00:09.1655830Z @truffle/core:     at Context.<anonymous> (/home/runner/work/truffle/truffle/packages/core/test/commands.js:52:15)
2021-06-16T18:00:09.1657131Z @truffle/core:     at callFn (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runnable.js:358:21)
2021-06-16T18:00:09.1659374Z @truffle/core:     at Test.Runnable.run (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runnable.js:346:5)
2021-06-16T18:00:09.1660861Z @truffle/core:     at Runner.runTest (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:621:10)
2021-06-16T18:00:09.1662196Z @truffle/core:     at /home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:745:12
2021-06-16T18:00:09.1663520Z @truffle/core:     at next (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:538:14)
2021-06-16T18:00:09.1664591Z @truffle/core:     at /home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:548:7
2021-06-16T18:00:09.1665682Z @truffle/core:     at next (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:430:14)
2021-06-16T18:00:09.1666873Z @truffle/core:     at Immediate.<anonymous> (/home/runner/work/truffle/truffle/node_modules/mocha/lib/runner.js:516:5)
2021-06-16T18:00:09.1667945Z @truffle/core:     at processImmediate (internal/timers.js:462:21)
2021-06-16T18:00:09.2150790Z @truffle/core: error Command failed with exit code 1.