unable to perform unit test in angular 8 .net core

When I run

ng test command 

Getting below error:

[error] Error: error TS6046: Argument for '--target' option must be: 'es3', 'es5', 'es6', 'es2015', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'esnext'.