exact_items validation for Array

lovelydinosaur · lovelydinosaur · commit a50e0e3deceb · 2018-02-21T16:31:58.000Z
diff --git a/coreapi/typesys.py b/coreapi/typesys.py
@@ -350,6 +350,8 @@ def validate(self, value, definitions=None):
 
         validated = []
 
+        if self.min_items is not None and self.min_items == self.max_items and len(value) != self.min_items:
+            self.error('exact_items')
         if self.min_items is not None and len(value) < self.min_items:
             if self.min_items == 1:
                 self.error('empty')
diff --git a/tests/typesys/test_array.py b/tests/typesys/test_array.py
@@ -53,6 +53,14 @@ def test_array_empty():
     assert exc.value.detail == 'Must not be empty.'
 
 
+def test_array_exact_count():
+    schema = Array(min_items=3, max_items=3)
+    assert schema.validate([1, 2, 3]) == [1, 2, 3]
+    with pytest.raises(ValidationError) as exc:
+        schema.validate([1, 2, 3, 4])
+    assert exc.value.detail == 'Must have 3 items.'
+
+
 def test_array_unique_items():
     schema = Array(unique_items=True)
     assert schema.validate([1, 2, 3]) == [1, 2, 3]
