Add tests for empty HealthTable display to improve coverage

Author: ironman1947

test/show.jl

@@ -88,6 +88,18 @@
 
         @test contains(output_str, "HealthTable: 2 rows × 2 columns")
     end
+    @testset "HealthTable show() empty table" begin
+        using DataFrames
+        using HealthBase
+
+        df = DataFrame()
+        ht = HealthBase.HealthTable(df)
+
+        output_str = sprint(show, ht)
+
+        @test contains(output_str, "HealthTable: 0 rows × 0 columns")
+        @test contains(output_str, "HealthTable is empty")
+        end
 
 
 end