csharp-mstest

Name: csharp-mstest
Author: github

8.7kinstalls4.6kforks

How to install csharp-mstest?

github/awesome-copilot/csharp-mstest

$npx -y skills add github/awesome-copilot --skill csharp-mstest

Installs into the current project.

Summary

Get best practices for MSTest 3.x/4.x unit testing, including modern assertion APIs and data-driven tests

Files · 1

View on GitHub

SKILL.md

1	# MSTest Best Practices (MSTest 3.x/4.x)
2
3	Your goal is to help me write effective unit tests with modern MSTest, using current APIs and best practices.
4
5	## Project Setup
6
7	- Use a separate test project with naming convention `[ProjectName].Tests`
8	- Reference MSTest 3.x+ NuGet packages (includes analyzers)
9	- Consider using MSTest.Sdk for simplified project setup
10	- Run tests with `dotnet test`
11
12	## Test Class Structure
13
14	- Use `[TestClass]` attribute for test classes
15	- Seal test classes by default for performance and design clarity
16	- Use `[TestMethod]` for test methods (prefer over `[DataTestMethod]`)
17	- Follow Arrange-Act-Assert (AAA) pattern
18	- Name tests using pattern `MethodName_Scenario_ExpectedBehavior`
19
20	```csharp
21	[TestClass]
22	public sealed class CalculatorTests
23	{
24	[TestMethod]
25	public void Add_TwoPositiveNumbers_ReturnsSum()
26	{
27	// Arrange
28	var calculator = new Calculator();
29
30	// Act
31	var result = calculator.Add(2, 3);
32
33	// Assert
34	Assert.AreEqual(5, result);
35	}
36	}
37	```
38
39	## Test Lifecycle
40
41	- Prefer constructors over `[TestInitialize]` - enables `readonly` fields and follows standard C# patterns
42	- Use `[TestCleanup]` for cleanup that must run even if test fails
43	- Combine constructor with async `[TestInitialize]` when async setup is needed
44
45	```csharp
46	[TestClass]
47	public sealed class ServiceTests
48	{
49	private readonly MyService _service; // readonly enabled by constructor
50
51	public ServiceTests()
52	{
53	_service = new MyService();
54	}
55
56	[TestInitialize]
57	public async Task InitAsync()
58	{
59	// Use for async initialization only
60	await _service.WarmupAsync();
61	}
62
63	[TestCleanup]
64	public void Cleanup() => _service.Reset();
65	}
66	```
67
68	### Execution Order
69
70	1. Assembly Initialization - `[AssemblyInitialize]` (once per test assembly)
71	2. Class Initialization - `[ClassInitialize]` (once per test class)
72	3. Test Initialization (for every test method):
73	1. Constructor
74	2. Set `TestContext` property
75	3. `[TestInitialize]`
76	4. Test Execution - test method runs
77	5. Test Cleanup (for every test method):
78	1. `[TestCleanup]`
79	2. `DisposeAsync` (if implemented)
80	3. `Dispose` (if implemented)
81	6. Class Cleanup - `[ClassCleanup]` (once per test class)
82	7. Assembly Cleanup - `[AssemblyCleanup]` (once per test assembly)
83
84	## Modern Assertion APIs
85
86	MSTest provides three assertion classes: `Assert`, `StringAssert`, and `CollectionAssert`.
87
88	### Assert Class - Core Assertions
89
90	```csharp
91	// Equality
92	Assert.AreEqual(expected, actual);
93	Assert.AreNotEqual(notExpected, actual);
94	Assert.AreSame(expectedObject, actualObject); // Reference equality
95	Assert.AreNotSame(notExpectedObject, actualObject);
96
97	// Null checks
98	Assert.IsNull(value);
99	Assert.IsNotNull(value);
100
101	// Boolean
102	Assert.IsTrue(condition);
103	Assert.IsFalse(condition);
104
105	// Fail/Inconclusive
106	Assert.Fail("Test failed due to...");
107	Assert.Inconclusive("Test cannot be completed because...");
108	```
109
110	### Exception Testing (Prefer over `[ExpectedException]`)
111
112	```csharp
113	// Assert.Throws - matches TException or derived types
114	var ex = Assert.Throws<ArgumentException>(() => Method(null));
115	Assert.AreEqual("Value cannot be null.", ex.Message);
116
117	// Assert.ThrowsExactly - matches exact type only
118	var ex = Assert.ThrowsExactly<InvalidOperationException>(() => Method());
119
120	// Async versions
121	var ex = await Assert.ThrowsAsync<HttpRequestException>(async () => await client.GetAsync(url));
122	var ex = await Assert.ThrowsExactlyAsync<InvalidOperationException>(async () => await Method());
123	```
124
125	### Collection Assertions (Assert class)
126
127	```csharp
128	Assert.Contains(expectedItem, collection);
129	Assert.DoesNotContain(unexpectedItem, collection);
130	Assert.ContainsSingle(collection); // exactly one element
131	Assert.HasCount(5, collection);
132	Assert.IsEmpty(collection);
133	Assert.IsNotEmpty(collection);
134	```
135
136	### String Assertions (Assert class)
137
138	```csharp
139	Assert.Contains("expected", actualString);
140	Assert.StartsWith("prefix", actualString);
141	Assert.EndsWith("suffix", actualString);
142	Assert.DoesNotStartWith("prefix", actualString);
143	Assert.DoesNotEndWith("suffix", actualString);
144	Assert.MatchesRegex(@"\d{3}-\d{4}", phoneNumber);
145	Assert.DoesNotMatchRegex(@"\d+", textOnly);
146	```
147
148	### Comparison Assertions
149
150	```csharp
151	Assert.IsGreaterThan(lowerBound, actual);
152	Assert.IsGreaterThanOrEqualTo(lowerBound, actual);
153	Assert.IsLessThan(upperBound, actual);
154	Assert.IsLessThanOrEqualTo(upperBound, actual);
155	Assert.IsInRange(actual, low, high);
156	Assert.IsPositive(number);
157	Assert.IsNegative(number);
158	```
159
160	### Type Assertions
161
162	```csharp
163	// MSTest 3.x - uses out parameter
164	Assert.IsInstanceOfType<MyClass>(obj, out var typed);
165	typed.DoSomething();
166
167	// MSTest 4.x - returns typed result directly
168	var typed = Assert.IsInstanceOfType<MyClass>(obj);
169	typed.DoSomething();
170
171	Assert.IsNotInstanceOfTyp

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csharp-mstest

8.7kinstalls4.6kforks

View on GitHub

How to install csharp-mstest?

github/awesome-copilot/csharp-mstest

$npx -y skills add github/awesome-copilot --skill csharp-mstest

Installs into the current project.

Summary

Get best practices for MSTest 3.x/4.x unit testing, including modern assertion APIs and data-driven tests

Files · 1

View on GitHub

SKILL.md

1	# MSTest Best Practices (MSTest 3.x/4.x)
2
3	Your goal is to help me write effective unit tests with modern MSTest, using current APIs and best practices.
4
5	## Project Setup
6
7	- Use a separate test project with naming convention `[ProjectName].Tests`
8	- Reference MSTest 3.x+ NuGet packages (includes analyzers)
9	- Consider using MSTest.Sdk for simplified project setup
10	- Run tests with `dotnet test`
11
12	## Test Class Structure
13
14	- Use `[TestClass]` attribute for test classes
15	- Seal test classes by default for performance and design clarity
16	- Use `[TestMethod]` for test methods (prefer over `[DataTestMethod]`)
17	- Follow Arrange-Act-Assert (AAA) pattern
18	- Name tests using pattern `MethodName_Scenario_ExpectedBehavior`
19
20	```csharp
21	[TestClass]
22	public sealed class CalculatorTests
23	{
24	[TestMethod]
25	public void Add_TwoPositiveNumbers_ReturnsSum()
26	{
27	// Arrange
28	var calculator = new Calculator();
29
30	// Act
31	var result = calculator.Add(2, 3);
32
33	// Assert
34	Assert.AreEqual(5, result);
35	}
36	}
37	```
38
39	## Test Lifecycle
40
41	- Prefer constructors over `[TestInitialize]` - enables `readonly` fields and follows standard C# patterns
42	- Use `[TestCleanup]` for cleanup that must run even if test fails
43	- Combine constructor with async `[TestInitialize]` when async setup is needed
44
45	```csharp
46	[TestClass]
47	public sealed class ServiceTests
48	{
49	private readonly MyService _service; // readonly enabled by constructor
50
51	public ServiceTests()
52	{
53	_service = new MyService();
54	}
55
56	[TestInitialize]
57	public async Task InitAsync()
58	{
59	// Use for async initialization only
60	await _service.WarmupAsync();
61	}
62
63	[TestCleanup]
64	public void Cleanup() => _service.Reset();
65	}
66	```
67
68	### Execution Order
69
70	1. Assembly Initialization - `[AssemblyInitialize]` (once per test assembly)
71	2. Class Initialization - `[ClassInitialize]` (once per test class)
72	3. Test Initialization (for every test method):
73	1. Constructor
74	2. Set `TestContext` property
75	3. `[TestInitialize]`
76	4. Test Execution - test method runs
77	5. Test Cleanup (for every test method):
78	1. `[TestCleanup]`
79	2. `DisposeAsync` (if implemented)
80	3. `Dispose` (if implemented)
81	6. Class Cleanup - `[ClassCleanup]` (once per test class)
82	7. Assembly Cleanup - `[AssemblyCleanup]` (once per test assembly)
83
84	## Modern Assertion APIs
85
86	MSTest provides three assertion classes: `Assert`, `StringAssert`, and `CollectionAssert`.
87
88	### Assert Class - Core Assertions
89
90	```csharp
91	// Equality
92	Assert.AreEqual(expected, actual);
93	Assert.AreNotEqual(notExpected, actual);
94	Assert.AreSame(expectedObject, actualObject); // Reference equality
95	Assert.AreNotSame(notExpectedObject, actualObject);
96
97	// Null checks
98	Assert.IsNull(value);
99	Assert.IsNotNull(value);
100
101	// Boolean
102	Assert.IsTrue(condition);
103	Assert.IsFalse(condition);
104
105	// Fail/Inconclusive
106	Assert.Fail("Test failed due to...");
107	Assert.Inconclusive("Test cannot be completed because...");
108	```
109
110	### Exception Testing (Prefer over `[ExpectedException]`)
111
112	```csharp
113	// Assert.Throws - matches TException or derived types
114	var ex = Assert.Throws<ArgumentException>(() => Method(null));
115	Assert.AreEqual("Value cannot be null.", ex.Message);
116
117	// Assert.ThrowsExactly - matches exact type only
118	var ex = Assert.ThrowsExactly<InvalidOperationException>(() => Method());
119
120	// Async versions
121	var ex = await Assert.ThrowsAsync<HttpRequestException>(async () => await client.GetAsync(url));
122	var ex = await Assert.ThrowsExactlyAsync<InvalidOperationException>(async () => await Method());
123	```
124
125	### Collection Assertions (Assert class)
126
127	```csharp
128	Assert.Contains(expectedItem, collection);
129	Assert.DoesNotContain(unexpectedItem, collection);
130	Assert.ContainsSingle(collection); // exactly one element
131	Assert.HasCount(5, collection);
132	Assert.IsEmpty(collection);
133	Assert.IsNotEmpty(collection);
134	```
135
136	### String Assertions (Assert class)
137
138	```csharp
139	Assert.Contains("expected", actualString);
140	Assert.StartsWith("prefix", actualString);
141	Assert.EndsWith("suffix", actualString);
142	Assert.DoesNotStartWith("prefix", actualString);
143	Assert.DoesNotEndWith("suffix", actualString);
144	Assert.MatchesRegex(@"\d{3}-\d{4}", phoneNumber);
145	Assert.DoesNotMatchRegex(@"\d+", textOnly);
146	```
147
148	### Comparison Assertions
149
150	```csharp
151	Assert.IsGreaterThan(lowerBound, actual);
152	Assert.IsGreaterThanOrEqualTo(lowerBound, actual);
153	Assert.IsLessThan(upperBound, actual);
154	Assert.IsLessThanOrEqualTo(upperBound, actual);
155	Assert.IsInRange(actual, low, high);
156	Assert.IsPositive(number);
157	Assert.IsNegative(number);
158	```
159
160	### Type Assertions
161
162	```csharp
163	// MSTest 3.x - uses out parameter
164	Assert.IsInstanceOfType<MyClass>(obj, out var typed);
165	typed.DoSomething();
166
167	// MSTest 4.x - returns typed result directly
168	var typed = Assert.IsInstanceOfType<MyClass>(obj);
169	typed.DoSomething();
170
171	Assert.IsNotInstanceOfTyp

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