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fix: handle null in dictionary HasValue #750

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Merged
vbreuss merged 2 commits into from
Sep 3, 2025
Merged

fix: handle null in dictionary HasValue #750

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f4ce5f7
fix: handle `null` in dictionary `HasValue`
vbreuss Sep 3, 2025
0eebc2b
Fix review comment
vbreuss Sep 3, 2025
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4 changes: 3 additions & 1 deletion Source/aweXpect/That/Collections/ThatDictionary.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,5 +9,7 @@ namespace aweXpect;
public static partial class ThatDictionary
{
internal static bool ContainsValue<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TValue value)
=> dictionary.Any(x => value?.Equals(x.Value) == true);
=> value is null
? dictionary.Any(x => x.Value is null)
: dictionary.Any(x => value.Equals(x.Value));
}
4 changes: 3 additions & 1 deletion Source/aweXpect/That/Collections/ThatReadOnlyDictionary.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,5 +9,7 @@ namespace aweXpect;
public static partial class ThatReadOnlyDictionary
{
internal static bool ContainsValue<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dictionary, TValue value)
=> dictionary.Any(x => value?.Equals(x.Value) == true);
=> value is null
? dictionary.Any(x => x.Value is null)
: dictionary.Any(x => value.Equals(x.Value));
}
34 changes: 34 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatDictionary.ContainsValue.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,40 @@ public sealed class ContainsValue
{
public sealed class Tests
{
[Fact]
public async Task WhenNullValueDoesNotExist_ShouldFail()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).ContainsValue(null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
contains value <null>,
but it contained only [
41,
42,
43
]

Dictionary:
{[1] = 41, [2] = 42, [3] = 43}
""");
}

[Fact]
public async Task WhenNullValueExists_ShouldSucceed()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, null, 43,]);

async Task Act()
=> await That(subject).ContainsValue(null);

await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
36 changes: 36 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatDictionary.ContainsValues.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,17 @@ async Task Act()
await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenAllValuesExists_WithNull_ShouldSucceed()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [null, 42, 43,]);

async Task Act()
=> await That(subject).ContainsValues(42, null);

await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenOneValueIsMissing_ShouldFail()
{
Expand All @@ -44,6 +55,31 @@ ] in [
""");
}

[Fact]
public async Task WhenOneValueIsMissing_WithNull_ShouldFail()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).ContainsValues(42, null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
contains values [42, <null>],
but it did not contain [
<null>
] in [
41,
42,
43
]

Dictionary:
{[1] = 41, [2] = 42, [3] = 43}
""");
}

[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
30 changes: 30 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatDictionary.DoesNotContainValue.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,36 @@ public sealed class DoesNotContainValue
{
public sealed class Tests
{
[Fact]
public async Task WhenNullValueDoesNotExist_ShouldSucceed()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValue(null);

await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenNullValueExists_ShouldFail()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, null, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValue(null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
does not contain value <null>,
but it did

Dictionary:
{[1] = 41, [2] = <null>, [3] = 43}
""");
}

[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
32 changes: 32 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatDictionary.DoesNotContainValues.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,17 @@ async Task Act()
await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenAllValuesDoNotExist_WithNull_ShouldSucceed()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValues(2, null);

await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenAtLeastOneValueExists_ShouldFail()
{
Expand All @@ -40,6 +51,27 @@ but it did contain [
""");
}

[Fact]
public async Task WhenAtLeastOneValueExists_WithNull_ShouldFail()
{
IDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [null, 42, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValues(2, null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
does not contain values [2, <null>],
but it did contain [
<null>
]

Dictionary:
{[1] = <null>, [2] = 42, [3] = 43}
""");
}

[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
33 changes: 33 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatReadOnlyDictionary.ContainsValue.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,39 @@ public sealed class ContainsValue
{
public sealed class Tests
{
[Fact]
public async Task WhenNullValueDoesNotExist_ShouldFail()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).ContainsValue(null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
contains value <null>,
but it contained only [
41,
42,
43
]

Dictionary:
{[1] = 41, [2] = 42, [3] = 43}
""");
}

[Fact]
public async Task WhenNullValueExists_ShouldSucceed()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, null, 43,]);

async Task Act()
=> await That(subject).ContainsValue(null);

await That(Act).DoesNotThrow();
}
[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
36 changes: 36 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatReadOnlyDictionary.ContainsValues.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,17 @@ async Task Act()
await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenAllValuesExists_WithNull_ShouldSucceed()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [null, 42, 43,]);

async Task Act()
=> await That(subject).ContainsValues(42, null);

await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenOneValueIsMissing_ShouldFail()
{
Expand All @@ -45,6 +56,31 @@ ] in [
""");
}

[Fact]
public async Task WhenOneValueIsMissing_WithNull_ShouldFail()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).ContainsValues(42, null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
contains values [42, <null>],
but it did not contain [
<null>
] in [
41,
42,
43
]

Dictionary:
{[1] = 41, [2] = 42, [3] = 43}
""");
}

[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
30 changes: 30 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatReadOnlyDictionary.DoesNotContainValue.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,36 @@ public sealed class DoesNotContainValue
{
public sealed class Tests
{
[Fact]
public async Task WhenNullValueDoesNotExist_ShouldSucceed()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValue(null);

await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenNullValueExists_ShouldFail()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, null, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValue(null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
does not contain value <null>,
but it did

Dictionary:
{[1] = 41, [2] = <null>, [3] = 43}
""");
}

[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
32 changes: 32 additions & 0 deletions Tests/aweXpect.Tests/Collections/ThatReadOnlyDictionary.DoesNotContainValues.Tests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,17 @@ async Task Act()
await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenAllValuesDoNotExist_WithNull_ShouldSucceed()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [41, 42, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValues(2, null);

await That(Act).DoesNotThrow();
}

[Fact]
public async Task WhenAtLeastOneValueExists_ShouldFail()
{
Expand All @@ -41,6 +52,27 @@ but it did contain [
""");
}

[Fact]
public async Task WhenAtLeastOneValueExists_WithNull_ShouldFail()
{
IReadOnlyDictionary<int, int?> subject = ToDictionary<int, int?>([1, 2, 3,], [null, 42, 43,]);

async Task Act()
=> await That(subject).DoesNotContainValues(2, null);

await That(Act).Throws<XunitException>()
.WithMessage("""
Expected that subject
does not contain values [2, <null>],
but it did contain [
<null>
]

Dictionary:
{[1] = <null>, [2] = 42, [3] = 43}
""");
}

[Fact]
public async Task WhenSubjectIsNull_ShouldFail()
{
Expand Down
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