From c2e7f76272e3e18a881336f64cdee24fe62f3919 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Valentin=20Breu=C3=9F?= <vbreuss@gmail.com>
Date: Thu, 30 Apr 2026 21:56:19 +0200
Subject: [PATCH] coverage: add missing tests for `It.*`

---
 .../Mockolate.Tests/ItTests.IsNotNullTests.cs |  9 +++++++
 Tests/Mockolate.Tests/ItTests.IsNullTests.cs  |  9 +++++++
 .../ItTests.SequenceEqualsTests.cs            | 27 +++++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/Tests/Mockolate.Tests/ItTests.IsNotNullTests.cs b/Tests/Mockolate.Tests/ItTests.IsNotNullTests.cs
index 55ace76a..c63fed6b 100644
--- a/Tests/Mockolate.Tests/ItTests.IsNotNullTests.cs
+++ b/Tests/Mockolate.Tests/ItTests.IsNotNullTests.cs
@@ -30,6 +30,15 @@ public async Task NotNull_ShouldMatchWhenNotNull(int? value, int expectedCount)
 			await That(sut.Mock.Verify.DoSomething(It.IsNotNull<int?>(), It.Is(true))).Exactly(expectedCount);
 		}
 
+		[Fact]
+		public async Task ShouldReturnSharedInstance_WhenToStringIsOmitted()
+		{
+			IParameter<string> first = It.IsNotNull<string>();
+			IParameter<string> second = It.IsNotNull<string>();
+
+			await That(first).IsSameAs(second);
+		}
+
 		[Fact]
 		public async Task ToString_ShouldReturnExpectedValue()
 		{
diff --git a/Tests/Mockolate.Tests/ItTests.IsNullTests.cs b/Tests/Mockolate.Tests/ItTests.IsNullTests.cs
index 03e1a9f5..14402436 100644
--- a/Tests/Mockolate.Tests/ItTests.IsNullTests.cs
+++ b/Tests/Mockolate.Tests/ItTests.IsNullTests.cs
@@ -30,6 +30,15 @@ public async Task Null_ShouldMatchWhenNull(int? value, int expectedCount)
 			await That(sut.Mock.Verify.DoSomething(null, It.Is(true))).Exactly(expectedCount);
 		}
 
+		[Fact]
+		public async Task ShouldReturnSharedInstance_WhenToStringIsOmitted()
+		{
+			IParameter<string> first = It.IsNull<string>();
+			IParameter<string> second = It.IsNull<string>();
+
+			await That(first).IsSameAs(second);
+		}
+
 		[Fact]
 		public async Task ToString_ShouldReturnExpectedValue()
 		{
diff --git a/Tests/Mockolate.Tests/ItTests.SequenceEqualsTests.cs b/Tests/Mockolate.Tests/ItTests.SequenceEqualsTests.cs
index c5e6eb73..dd93a30f 100644
--- a/Tests/Mockolate.Tests/ItTests.SequenceEqualsTests.cs
+++ b/Tests/Mockolate.Tests/ItTests.SequenceEqualsTests.cs
@@ -161,6 +161,17 @@ public async Task ToString_Using_ShouldReturnExpectedValue()
 			await That(result).IsEqualTo(expectedValue);
 		}
 
+		[Fact]
+		public async Task ToString_WithNullElement_ShouldRenderNullToken()
+		{
+			IParameter<object?[]> sut = It.SequenceEquals<object?>("foo", null, 3);
+			string expectedValue = "It.SequenceEquals(\"foo\", null, 3)";
+
+			string? result = sut.ToString();
+
+			await That(result).IsEqualTo(expectedValue);
+		}
+
 		[Fact]
 		public async Task ToString_WithStringValues_ShouldReturnExpectedValue()
 		{
@@ -184,6 +195,22 @@ public async Task WithComparer_ShouldUseComparer()
 
 		public sealed class DoTests
 		{
+			[Fact]
+			public async Task Do_MultipleRegistrations_ShouldAllInvoke()
+			{
+				It.ISequenceEqualsParameter<int> sut = It.SequenceEquals(1, 2, 3);
+				int firstCount = 0;
+				int secondCount = 0;
+				((IParameterWithCallback<int[]>)sut).Do(_ => firstCount++);
+				((IParameterWithCallback<int[]>)sut).Do(_ => secondCount++);
+
+				int[] source = [1, 2, 3,];
+				((IParameterMatch<int[]>)sut).InvokeCallbacks(source);
+
+				await That(firstCount).IsEqualTo(1);
+				await That(secondCount).IsEqualTo(1);
+			}
+
 			[Fact]
 			public async Task Do_RegistersCallbackForArray()
 			{