src/main/java/org/fest/assertions/internal/Maps.java
public <K, V> void assertContainsOnly(Description description, Map<K, V> actual, MapEntry[] entries) {
    isNotEmptyOrNull(entries);
    assertNotNull(description, actual);
    Map<K, V> notExpected = new LinkedHashMap<K, V>(actual);
    Set<MapEntry> notFound = containsOnly(actual, entries, notExpected);
    if (!notFound.isEmpty() || !notExpected.isEmpty()) {
      throw failures.failure(description, shouldContainOnly(actual, entries, notFound, notExpected));
    }
  }
public <K, V> void assertContainsOnly(Description description, Map<K, V> actual, MapEntry[] entries) {
    isNotEmptyOrNull(entries);
    assertNotNull(description, actual);
    Map<K, V> notExpected = new LinkedHashMap<K, V>(actual);
    Set<MapEntry> notFound = containsOnly(actual, entries, notExpected);
    if (!notFound.isEmpty() || !notExpected.isEmpty()) {
      throw failures.failure(description, shouldContainOnly(actual, entries, notFound, notExpected));
    }
  }
Asserts that the given {@code Map} contains only the given entries, nothing else.

@param description contains information about the assertion.
@param actual the given {@code Map}.
@param entries the entries that are expected to be in the given {@code Map}.
@throws NullPointerException if the array of entries is {@code null}.
@throws IllegalArgumentException if the array of entries is empty.
@throws NullPointerException if any of the entries in the given array is {@code null}.
@throws AssertionError if the given {@code Map} is {@code null}.
@throws AssertionError if the given {@code Map} does not contain the given entries.