Add units tests

Author: redisdev

FakeApiTest/FakeHttpRequesterTests.cs

@@ -290,7 +290,7 @@ public void ShouldThrowCustomException()
         public void ShouldThrowExceptionWhenRequestIsNull()
         {
             //Arrange
-            var requester = new FakeHttpRequester("");
+            var requester = new FakeHttpRequester("DownloadFile.txt");
 
             //Act
             var exception = Assert.ThrowsException<ArgumentNullException>(() =>
@@ -301,5 +301,31 @@ public void ShouldThrowExceptionWhenRequestIsNull()
             //Assert
             Assert.AreEqual("request", exception.ParamName);
         }
+
+        [TestMethod]
+        public void ShouldThrowExceptionWhenConfigSourceIsNull()
+        {
+            //Act
+            var exception = Assert.ThrowsException<ArgumentNullException>(() =>
+            {
+                new FakeHttpRequester(null);
+            });
+
+            //Assert
+            Assert.AreEqual("configSource", exception.ParamName);
+        }
+
+        [TestMethod]
+        public void ShouldThrowExceptionWhenFileNotExists()
+        {
+            //Act
+            var exception = Assert.ThrowsException<FileLoadException>(() =>
+            {
+                new FakeHttpRequester("FakePath");
+            });
+
+            //Assert
+            Assert.AreEqual("File FakePath nor exists", exception.Message);
+        }
     }
 }

Src/FakeApi/FakeHttpRequester.cs

@@ -21,6 +21,10 @@ public class FakeHttpRequester: IHttpRequester
         public FakeHttpRequester(string configSource)
         {
             _configSource = configSource ?? throw new ArgumentNullException(nameof(configSource));
+            if(!File.Exists(configSource))
+            {
+                throw new FileLoadException($"File {configSource} nor exists");
+            }
         }
 
         /// <summary>