Add lost unit tests

test/Lemonad.ErrorHandling.Unit/Validator.Tests/ValidateTests.cs

@@ -0,0 +1,130 @@
+using System.Collections;
+using System.Linq;
+using Xunit;
+
+namespace Lemonad.ErrorHandling.Unit.Validator.Tests {
+    public class ValidateTests {
+        [Fact]
+        public void Single_False_Validation() {
+            const string error = "Not dividable by 2";
+            var validator = ErrorHandling.Validator.Value<int, string>(1).Validate(i => i % 2 == 0, error).ToList();
+            Assert.Single(validator, error);
+        }
+
+        [Fact]
+        public void Single_True_Validation() {
+            const string error = "Not dividable by 2";
+            var validator = ErrorHandling.Validator.Value<int, string>(2).Validate(i => i % 2 == 0, error).ToList();
+            Assert.Empty(validator);
+        }
+
+        [Fact]
+        public void Double_True_Validation() {
+            const string error1 = "Not dividable by 2";
+            const string error2 = "Is equal to 2.";
+            var validator = ErrorHandling.Validator.Value<int, string>(2)
+                .Validate(i => i % 2 == 0, error1)
+                .Validate(i => i == 2, x => error2)
+                .ToList();
+            Assert.Empty(validator);
+        }
+
+        [Fact]
+        public void Double_True_Validation_Verify_States() {
+            const string error1 = "Not dividable by 2";
+            const string error2 = "Is equal to 2.";
+            var state0 = ErrorHandling.Validator.Value<int, string>(2);
+            Assert.Empty(state0);
+            var state1 = state0.Validate(i => i % 2 == 0, error1);
+            Assert.Empty(state1);
+            var state2 = state1.Validate(i => i == 2, x => error2);
+            Assert.Empty(state2);
+            var validator = state2.ToList();
+            Assert.Empty(validator);
+        }
+
+        [Fact]
+        public void Double_False_Validation() {
+            const string error1 = "Is not equal to 0";
+            const string error2 = "Not dividable by 2";
+            var validator = ErrorHandling.Validator.Value<int, string>(1)
+                .Validate(i => i == 0, x => error1)
+                .Validate(i => i % 2 == 0, x => error2)
+                .ToList();
+            Assert.Equal(2, validator.Count);
+            Assert.Equal(error1, validator[0]);
+            Assert.Equal(error2, validator[1]);
+        }
+
+        [Fact]
+        public void Double_False_Validation_Verify_States() {
+            const string error1 = "Is not equal to 0";
+            const string error2 = "Not dividable by 2";
+            var state0 = ErrorHandling.Validator.Value<int, string>(1);
+            Assert.Empty(state0);
+            var state1 = state0.Validate(i => i == 0, x => error1);
+            Assert.Single(state1);
+            var state2 = state1.Validate(i => i % 2 == 0, x => error2);
+            Assert.Equal(2, state2.Count);
+            var validator = state2.ToList();
+            Assert.Equal(2, validator.Count);
+            Assert.Equal(error1, validator[0]);
+            Assert.Equal(error2, validator[1]);
+        }
+
+        [Fact]
+        public void First_False_Validation_And_Second_True_Validation_Verify_States() {
+            const string error1 = "Is not equal to 0";
+            const string error2 = "Not dividable by 2";
+            var state0 = ErrorHandling.Validator.Value<int, string>(2);
+            var state1 = state0.Validate(i => i == 0, x => error1);
+            var state2 = state1.Validate(i => i % 2 == 0, x => error2);
+            // These errors occur since the collection in `state2` references the collection in `state0`.
+            // So all errors in `state2` are found in `state0` therefor.
+            Assert.Empty(state0);
+            Assert.Single(state1);
+            Assert.Single(state2);
+        }
+
+        [Fact]
+        public void First_True_Validation_And_Second_False_Validation_Verify_States() {
+            const string error1 = "Is not equal to 0";
+            const string error2 = "Not dividable by 2";
+            var state0 = ErrorHandling.Validator.Value<int, string>(2);
+            var state1 = state0.Validate(i => i % 2 == 0, x => error2);
+            var state2 = state1.Validate(i => i == 0, x => error1);
+            Assert.Empty(state0);
+            Assert.Empty(state1);
+            Assert.Single(state2);
+        }
+
+        [Fact]
+        public void First_False_Validation_And_Second_True_Validation() {
+            const string error1 = "Is not equal to 0";
+            const string error2 = "Not dividable by 2";
+            var validator = ErrorHandling.Validator.Value<int, string>(2)
+                .Validate(i => i == 0, x => error1)
+                .Validate(i => i % 2 == 0, x => error2)
+                .ToList();
+            Assert.Single((IEnumerable) validator);
+        }
+
+        [Fact]
+        public void First_True_Validation_And_Second_False_Validation() {
+            const string error1 = "Is not equal to 0";
+            const string error2 = "Not dividable by 2";
+            var validator = ErrorHandling.Validator.Value<int, string>(2)
+                .Validate(i => i % 2 == 0, x => error2)
+                .Validate(i => i == 0, x => error1)
+                .ToList();
+            Assert.Single((IEnumerable) validator);
+        }
+
+        [Fact]
+        public void Result_Does_Not_Create_New_Instance_On_Get() {
+            var validator = ErrorHandling.Validator.Value<int, string>(2);
+            Assert.Equal(validator.Result, validator.Result);
+            Assert.StrictEqual(validator.Result, validator.Result);
+        }
+    }
+}