Make interestExpense nullable. (#131)

Fixes #130

Author: Matthiee

FinancialModelingPrepApi/Model/CompanyValuation/IncomeStatementResponse.cs

@@ -65,7 +65,7 @@ public class IncomeStatementResponse
         public double? InterestIncome { get; set; }
 
         [JsonPropertyName("interestExpense")]
-        public double InterestExpense { get; set; }
+        public double? InterestExpense { get; set; }
 
         [JsonPropertyName("depreciationAndAmortization")]
         public double DepreciationAndAmortization { get; set; }

Tests/CompanyValuation/CompanyValuationTests.cs

@@ -177,6 +177,7 @@ public async Task GetEnterpriseValueQuarter(string symbol)
         [InlineData("MTG")]
         [InlineData("GSM")]
         [InlineData("BZZUY")]
+        [InlineData("MPW")]
         public async Task GetIncomeStatement(string symbol)
         {
             var result = await api.GetIncomeStatementAsync(symbol, Period.Annual, 10000);
@@ -195,6 +196,7 @@ public async Task GetIncomeStatement(string symbol)
         [InlineData("AAP")]
         [InlineData("MTG")]
         [InlineData("GSM")]
+        [InlineData("MPW")]
         public async Task GetIncomeStatementPerQuarter(string symbol)
         {
             var result = await api.GetIncomeStatementAsync(symbol, Period.Quarter, limit: 10000);