feat: add xunit assert docs (#368)

Author: Meir017

docs/XunitAnalyzer.md

@@ -6,6 +6,16 @@ This is a generated file, please edit src\FluentAssertions.Analyzers.FluentAsser
 
 - [AssertTrue](#scenario-asserttrue) - `flag.Should().BeTrue();`
 - [AssertFalse](#scenario-assertfalse) - `flag.Should().BeFalse();`
+- [AssertSame](#scenario-assertsame) - `obj1.Should().BeSameAs(obj2);`
+- [AssertNotSame](#scenario-assertnotsame) - `obj1.Should().NotBeSameAs(obj2);`
+- [AssertDoubleEqual](#scenario-assertdoubleequal) - `actual.Should().BeApproximately(expected, tolerance);`
+- [AssertDateTimeEqual](#scenario-assertdatetimeequal) - `actual.Should().BeCloseTo(expected, TimeSpan.FromDays(3));`
+- [AssertObjectEqual](#scenario-assertobjectequal) - `actual.Should().Be(expected);`
+- [AssertObjectEqualWithComparer](#scenario-assertobjectequalwithcomparer) - `actual.Should().BeEquivalentTo(expected, options => options.Using(EqualityComparer<object>.Default));`
+- [AssertObjectNotEqual](#scenario-assertobjectnotequal) - `actual.Should().NotBe(expected);`
+- [AssertObjectNotEqualWithComparer](#scenario-assertobjectnotequalwithcomparer) - `actual.Should().NotBeEquivalentTo(expected, options => options.Using(EqualityComparer<object>.Default));`
+- [AssertStrictEqual](#scenario-assertstrictequal) - `actual.Should().Be(expected);`
+- [AssertNotStrictEqual](#scenario-assertnotstrictequal) - `actual.Should().NotBe(expected);`
 
 
 ## Scenarios
@@ -64,4 +74,307 @@ Actual:   True */
 flag.Should().BeFalse(); /* fail message: Expected flag to be false, but found True. */
 ```
 
+### scenario: AssertSame
+
+```cs
+// arrange
+var obj1 = new object();
+var obj2 = obj1;
+
+// old assertion:
+Assert.Same(obj1, obj2);
+
+// new assertion:
+obj1.Should().BeSameAs(obj2);
+```
+
+#### Failure messages
+
+```cs
+object obj1 = 6;
+object obj2 = "foo";
+
+// old assertion:
+Assert.Same(obj1, obj2); /* fail message: Assert.Same() Failure
+Expected: 6
+Actual:   foo */
+
+// new assertion:
+obj1.Should().BeSameAs(obj2); /* fail message: Expected obj1 to refer to "foo", but found 6. */
+```
+
+### scenario: AssertNotSame
+
+```cs
+// arrange
+object obj1 = 6;
+object obj2 = "foo";
+
+// old assertion:
+Assert.NotSame(obj1, obj2);
+
+// new assertion:
+obj1.Should().NotBeSameAs(obj2);
+```
+
+#### Failure messages
+
+```cs
+object obj1 = "foo";
+object obj2 = "foo";
+
+// old assertion:
+Assert.NotSame(obj1, obj2); /* fail message: Assert.NotSame() Failure */
+
+// new assertion:
+obj1.Should().NotBeSameAs(obj2); /* fail message: Did not expect obj1 to refer to "foo". */
+```
+
+### scenario: AssertDoubleEqual
+
+```cs
+// arrange
+double actual = 3.14;
+double expected = 3.141;
+double tolerance = 0.00159;
+
+// old assertion:
+Assert.Equal(expected, actual, tolerance);
+
+// new assertion:
+actual.Should().BeApproximately(expected, tolerance);
+```
+
+#### Failure messages
+
+```cs
+double actual = 3.14;
+double expected = 4.2;
+double tolerance = 0.0001;
+
+// old assertion:
+Assert.Equal(expected, actual, tolerance); /* fail message: Assert.Equal() Failure
+Expected: 4.2000000000000002
+Actual:   3.1400000000000001 */
+
+// new assertion:
+actual.Should().BeApproximately(expected, tolerance); /* fail message: Expected actual to approximate 4.2 +/- 0.0001, but 3.14 differed by 1.06. */
+```
+
+### scenario: AssertDateTimeEqual
+
+```cs
+// arrange
+var actual = new DateTime(2021, 1, 1);
+var expected = new DateTime(2021, 1, 2);
+
+// old assertion:
+Assert.Equal(expected, actual, TimeSpan.FromDays(3));
+
+// new assertion:
+actual.Should().BeCloseTo(expected, TimeSpan.FromDays(3));
+```
+
+#### Failure messages
+
+```cs
+var actual = new DateTime(2021, 1, 1);
+var expected = new DateTime(2021, 1, 2);
+
+// old assertion:
+Assert.Equal(expected, actual, TimeSpan.FromHours(3)); /* fail message: Assert.Equal() Failure
+Expected: 1/2/2021 12:00:00 AM 
+Actual:   1/1/2021 12:00:00 AM difference 1.00:00:00 is larger than 03:00:00 */
+
+// new assertion:
+actual.Should().BeCloseTo(expected, TimeSpan.FromHours(3)); /* fail message: Expected actual to be within 3h from <2021-01-02>, but <2021-01-01> was off by 1d. */
+```
+
+### scenario: AssertObjectEqual
+
+```cs
+// arrange
+object actual = "foo";
+object expected = "foo";
+
+// old assertion:
+Assert.Equal(expected, actual);
+
+// new assertion:
+actual.Should().Be(expected);
+```
+
+#### Failure messages
+
+```cs
+object actual = "foo";
+object expected = 6;
+
+// old assertion:
+Assert.Equal(expected, actual); /* fail message: Assert.Equal() Failure
+Expected: 6
+Actual:   foo */
+
+// new assertion:
+actual.Should().Be(expected); /* fail message: Expected actual to be 6, but found "foo". */
+```
+
+### scenario: AssertObjectEqualWithComparer
+
+```cs
+// arrange
+object actual = "foo";
+object expected = "foo";
+
+// old assertion:
+Assert.Equal(expected, actual, EqualityComparer<object>.Default);
+
+// new assertion:
+actual.Should().BeEquivalentTo(expected, options => options.Using(EqualityComparer<object>.Default));
+```
+
+#### Failure messages
+
+```cs
+object actual = "foo";
+object expected = 6;
+
+// old assertion:
+Assert.Equal(expected, actual, EqualityComparer<object>.Default); /* fail message: Assert.Equal() Failure
+Expected: 6
+Actual:   foo */
+
+// new assertion:
+actual.Should().BeEquivalentTo(expected, options => options.Using(EqualityComparer<object>.Default)); /* fail message: Expected actual to be 6, but found "foo".
+
+With configuration:
+- Use declared types and members
+- Compare enums by value
+- Compare tuples by their properties
+- Compare anonymous types by their properties
+- Compare records by their members
+- Include non-browsable members
+- Match member by name (or throw)
+- Use System.Collections.Generic.ObjectEqualityComparer`1[System.Object] for objects of type System.Object
+- Be strict about the order of items in byte arrays
+- Without automatic conversion.
+ */
+```
+
+### scenario: AssertObjectNotEqual
+
+```cs
+// arrange
+object actual = "foo";
+object expected = 6;
+
+// old assertion:
+Assert.NotEqual(expected, actual);
+
+// new assertion:
+actual.Should().NotBe(expected);
+```
+
+#### Failure messages
+
+```cs
+object actual = "foo";
+object expected = "foo";
+
+// old assertion:
+Assert.NotEqual(expected, actual); /* fail message: Assert.NotEqual() Failure
+Expected: Not "foo"
+Actual:   "foo" */
+
+// new assertion:
+actual.Should().NotBe(expected); /* fail message: Did not expect actual to be equal to "foo". */
+```
+
+### scenario: AssertObjectNotEqualWithComparer
+
+```cs
+// arrange
+object actual = "foo";
+object expected = 6;
+
+// old assertion:
+Assert.NotEqual(expected, actual, EqualityComparer<object>.Default);
+
+// new assertion:
+actual.Should().NotBeEquivalentTo(expected, options => options.Using(EqualityComparer<object>.Default));
+```
+
+#### Failure messages
+
+```cs
+object actual = "foo";
+object expected = "foo";
+
+// old assertion:
+Assert.NotEqual(expected, actual, EqualityComparer<object>.Default); /* fail message: Assert.NotEqual() Failure
+Expected: Not "foo"
+Actual:   "foo" */
+
+// new assertion:
+actual.Should().NotBeEquivalentTo(expected, options => options.Using(EqualityComparer<object>.Default)); /* fail message: Expected actual not to be equivalent to "foo", but they are. */
+```
+
+### scenario: AssertStrictEqual
+
+```cs
+// arrange
+object actual = "foo";
+object expected = "foo";
+
+// old assertion:
+Assert.StrictEqual(expected, actual);
+
+// new assertion:
+actual.Should().Be(expected);
+```
+
+#### Failure messages
+
+```cs
+object actual = "foo";
+object expected = 6;
+
+// old assertion:
+Assert.StrictEqual(expected, actual); /* fail message: Assert.Equal() Failure
+Expected: 6
+Actual:   foo */
+
+// new assertion:
+actual.Should().Be(expected); /* fail message: Expected actual to be 6, but found "foo". */
+```
+
+### scenario: AssertNotStrictEqual
+
+```cs
+// arrange
+object actual = "foo";
+object expected = 6;
+
+// old assertion:
+Assert.NotStrictEqual(expected, actual);
+
+// new assertion:
+actual.Should().NotBe(expected);
+```
+
+#### Failure messages
+
+```cs
+object actual = "foo";
+object expected = "foo";
+
+// old assertion:
+Assert.NotStrictEqual(expected, actual); /* fail message: Assert.NotEqual() Failure
+Expected: Not "foo"
+Actual:   "foo" */
+
+// new assertion:
+actual.Should().NotBe(expected); /* fail message: Did not expect actual to be equal to "foo". */
+```
+