[ADDED] some test cases for when we install only one dcc. This would catch the issue we had.

Author: AJubrey

Assets/FbxExporters/Editor/UnitTests/FbxExportSettingsTest.cs

@@ -211,6 +211,24 @@ public void TestFindPreferredProgram()
             preferred = ExportSettings.instance.GetPreferredDCCApp();
 
             Assert.AreEqual(preferred, -1);
+
+            //Testing the results of only having a mayaLT install
+            ExportSettings.instance.SetDCCOptionNames(new List<string> { "Maya LT"+ "2018" }); //hardcoded because the constant is changed in another branch but not this one at this time
+            preferred = ExportSettings.instance.GetPreferredDCCApp();
+
+            Assert.AreEqual(preferred, 0);
+
+            //Testing the results of only having a maya install
+            ExportSettings.instance.SetDCCOptionNames(new List<string> { ExportSettings.kMayaOptionName + "2018" }); //hardcoded because the constant is changed in another branch but not this one at this time
+            preferred = ExportSettings.instance.GetPreferredDCCApp();
+
+            Assert.AreEqual(preferred, 0);
+
+            //Testing the results of only having a max install
+            ExportSettings.instance.SetDCCOptionNames(new List<string> { ExportSettings.kMaxOptionName + "2018" }); //hardcoded because the constant is changed in another branch but not this one at this time
+            preferred = ExportSettings.instance.GetPreferredDCCApp();
+
+            Assert.AreEqual(preferred, 0);
         }
 
         [Test]