Write Jasmine angular test cases for the functions inside object declared globally in ts

How to write a test case for:

let column: {
    headerName: "Amount of investment",
    field: "anxFundDetInvestmentAmount",
    cellClass: "cell-wrap-amount",
    width: 200,
    autoHeight: true,
    sortable: true,
    valueFormatter: (params: { value: any }) => {
      return this.filterCurrency(params);
    },
  },

Can you please help on this