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# MUnit Iterable and Map Matchers Reference

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

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MUnit Iterable and Map matchers are matcher functions for asserting conditions on collections and
maps during a MUnit test. Use them with the Assert That processor to check items, keys, values, and
sizes of iterables and maps.

## everyItem(Matcher)

Checks that every element in the expression matches the specified matcher.

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::everyItem(MunitTools::notNullValue())]"/>
```

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::everyItem(MunitTools::startsWith('a'))]"/>
```

## hasItem(Object)

Checks that any element in the expression matches the specified matcher.

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasItem('example')]"/>
```

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasItem(MunitTools::startsWith('a'))]"/>
```

## hasSize(Matcher|Integer)

Checks that the size of the expression matches the specified matcher.

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasSize(MunitTools::greaterThan(2))]"/>
```

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasSize(5)]"/>
```

## isEmpty()

Checks that the expression is an empty collection.

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::isEmpty()]"/>
```

## hasKey(Matcher|String)

Checks that the expression has a key that matches the specified matcher.

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasKey(MunitTools::startsWith('a'))]"/>
```

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasKey('mykey')]"/>
```

## hasValue(Object)

Checks that the expression has a value that matches the specified matcher.

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasValue('myvalue')]"/>
```

Example

```xml
<munit-tools:assert-that
expression="#[payload]"
is="#[MunitTools::hasValue(MunitTools::startsWith('a'))]"/>
```

## See Also

- [MUnit Matchers](https://docs.mulesoft.com/munit/latest/munit-matchers)

- [Core Matchers Reference](https://docs.mulesoft.com/munit/latest/core-matchers-reference)

- [String Matchers Reference](https://docs.mulesoft.com/munit/latest/string-matchers-reference)

- [Comparable Matchers Reference](https://docs.mulesoft.com/munit/latest/comparable-matchers-reference)