diff --git a/src/protean/fields/base.py b/src/protean/fields/base.py
index eb752927..ddedb181 100644
--- a/src/protean/fields/base.py
+++ b/src/protean/fields/base.py
@@ -101,7 +101,7 @@ def __init__(
         messages.update(error_messages or {})
         self.error_messages = messages
 
-    def _generic_param_values_for_repr(self):
+    def _generic_param_values_for_repr(self) -> list[str]:
         """Return the generic parameter values for the Field's repr"""
         values = []
         if self.description:
@@ -117,7 +117,10 @@ def _generic_param_values_for_repr(self):
             if callable(self.default):
                 values.append(f"default={self.default.__name__}")
             else:
-                values.append(f"default='{self.default}'")
+                if isinstance(self.default, str):
+                    values.append(f"default='{self.default}'")
+                else:
+                    values.append(f"default={self.default}")
         return values
 
     def __repr__(self):
diff --git a/src/protean/fields/basic.py b/src/protean/fields/basic.py
index e3907844..de2615fb 100644
--- a/src/protean/fields/basic.py
+++ b/src/protean/fields/basic.py
@@ -130,8 +130,8 @@ def __repr__(self):
         # Generate repr values specific to this field
         values = self._generic_param_values_for_repr()
         if self.max_value:
-            values.append(f"max_value={self.max_length}")
-        if self.min_value:
+            values.append(f"max_value={self.max_value}")
+        if self.min_value or self.min_value == 0:
             values.append(f"min_value={self.min_value}")
 
         return f"{self.__class__.__name__}(" + ", ".join(values) + ")"
@@ -173,8 +173,8 @@ def __repr__(self):
         # Generate repr values specific to this field
         values = self._generic_param_values_for_repr()
         if self.max_value:
-            values.append(f"max_value={self.max_length}")
-        if self.min_value:
+            values.append(f"max_value={self.max_value}")
+        if self.min_value or self.min_value == 0.0:
             values.append(f"min_value={self.min_value}")
 
         return f"{self.__class__.__name__}(" + ", ".join(values) + ")"
@@ -462,6 +462,16 @@ def as_dict(self, value):
         """Return JSON-compatible value of self"""
         return value
 
+    def __repr__(self):
+        # Generate repr values specific to this field
+        values = []
+        if self.schema_name:
+            values.append(f"'{self.schema_name}'")
+
+        values.extend(self._generic_param_values_for_repr())
+
+        return f"{self.__class__.__name__}(" + ", ".join(values) + ")"
+
 
 class Date(Field):
     """Concrete field implementation for the Date type."""
diff --git a/tests/field/test_boolean.py b/tests/field/test_boolean.py
new file mode 100644
index 00000000..e55032be
--- /dev/null
+++ b/tests/field/test_boolean.py
@@ -0,0 +1,23 @@
+import pytest
+
+from protean.fields.basic import Boolean
+
+
+@pytest.mark.parametrize(
+    "value,expected",
+    [
+        (True, True),
+        (False, False),
+        (1, True),
+        (0, False),
+        ("t", True),
+        ("f", False),
+        ("True", True),
+        ("False", False),
+        (1.0, True),
+        (0.0, False),
+    ],
+)
+def test_boolean_cast_to_type(value, expected):
+    field = Boolean()
+    assert field._cast_to_type(value) == expected
diff --git a/tests/field/test_identifier.py b/tests/field/test_identifier.py
index e6fd6a3d..697396c2 100644
--- a/tests/field/test_identifier.py
+++ b/tests/field/test_identifier.py
@@ -136,3 +136,7 @@ def test_that_default_is_picked_from_domain_config(self):
             assert identifier._load(uuid_val) == uuid_val
             assert identifier.identity_type == IdentityType.UUID.value
             assert identifier.as_dict(uuid_val) == str(uuid_val)
+
+    def test_invalid_identity_type(self):
+        with pytest.raises(ValidationError):
+            Identifier(identity_type="invalid")
diff --git a/tests/field/test_method.py b/tests/field/test_method.py
new file mode 100644
index 00000000..4b40f366
--- /dev/null
+++ b/tests/field/test_method.py
@@ -0,0 +1,21 @@
+from datetime import datetime, timezone
+
+from protean.fields import Method
+
+
+def utc_now():
+    return datetime.now(timezone.utc)
+
+
+def test_method_repr_and_str():
+    method_obj1 = Method("fake_method")
+    method_obj2 = Method("fake_method", required=True)
+    method_obj4 = Method("fake_method", required=True, default=utc_now)
+
+    assert repr(method_obj1) == str(method_obj1) == "Method()"
+    assert repr(method_obj2) == str(method_obj2) == "Method(required=True)"
+    assert (
+        repr(method_obj4)
+        == str(method_obj4)
+        == "Method(required=True, default=utc_now)"
+    )
diff --git a/tests/field/test_nested.py b/tests/field/test_nested.py
new file mode 100644
index 00000000..e6271e0c
--- /dev/null
+++ b/tests/field/test_nested.py
@@ -0,0 +1,21 @@
+from protean.fields import Nested
+
+
+def test_nested_field_repr_and_str():
+    nested_obj1 = Nested("schema1")
+    nested_obj2 = Nested("schema1", many=True, required=True)
+    nested_obj3 = Nested("schema1", default={"name": "John Doe"})
+    nested_obj4 = Nested("schema1", required=True, default={"name": "John Doe"})
+
+    assert repr(nested_obj1) == str(nested_obj1) == "Nested('schema1')"
+    assert repr(nested_obj2) == str(nested_obj2) == "Nested('schema1', required=True)"
+    assert (
+        repr(nested_obj3)
+        == str(nested_obj3)
+        == "Nested('schema1', default={'name': 'John Doe'})"
+    )
+    assert (
+        repr(nested_obj4)
+        == str(nested_obj4)
+        == "Nested('schema1', required=True, default={'name': 'John Doe'})"
+    )
diff --git a/tests/field/test_repr.py b/tests/field/test_repr.py
index 75b8398c..4a4005a4 100644
--- a/tests/field/test_repr.py
+++ b/tests/field/test_repr.py
@@ -1,4 +1,4 @@
-from protean.fields import String, Text
+from protean.fields import Auto, Float, Integer, String, Text
 
 
 def test_identifier_in_repr():
@@ -85,3 +85,53 @@ def test_text_repr_and_str():
         == str(text_obj4)
         == "Text(required=True, default='John Doe', sanitize=False)"
     )
+
+
+def test_integer_repr_and_str():
+    int_obj1 = Integer(required=True)
+    int_obj2 = Integer(required=True, default=100)
+    int_obj3 = Integer(required=True, min_value=0, max_value=100)
+    int_obj4 = Integer(required=True, default=100, min_value=0, max_value=100)
+
+    assert repr(int_obj1) == str(int_obj1) == "Integer(required=True)"
+    assert repr(int_obj2) == str(int_obj2) == "Integer(required=True, default=100)"
+    assert (
+        repr(int_obj3)
+        == str(int_obj3)
+        == "Integer(required=True, max_value=100, min_value=0)"
+    )
+    assert (
+        repr(int_obj4)
+        == str(int_obj4)
+        == "Integer(required=True, default=100, max_value=100, min_value=0)"
+    )
+
+
+def test_float_repr_and_str():
+    float_obj1 = Float(required=True)
+    float_obj2 = Float(required=True, default=100.0)
+    float_obj3 = Float(required=True, min_value=0.0, max_value=100.0)
+    float_obj4 = Float(required=True, default=100.0, min_value=0.0, max_value=100.0)
+
+    assert repr(float_obj1) == str(float_obj1) == "Float(required=True)"
+    assert repr(float_obj2) == str(float_obj2) == "Float(required=True, default=100.0)"
+    assert (
+        repr(float_obj3)
+        == str(float_obj3)
+        == "Float(required=True, max_value=100.0, min_value=0.0)"
+    )
+    assert (
+        repr(float_obj4)
+        == str(float_obj4)
+        == "Float(required=True, default=100.0, max_value=100.0, min_value=0.0)"
+    )
+
+
+def test_auto_repr_and_str():
+    auto_obj1 = Auto()
+    auto_obj2 = Auto(required=True)
+    auto_obj3 = Auto(required=True, increment=True)
+
+    assert repr(auto_obj1) == str(auto_obj1) == "Auto()"
+    assert repr(auto_obj2) == str(auto_obj2) == "Auto(required=True)"
+    assert repr(auto_obj3) == str(auto_obj3) == "Auto(required=True, increment=True)"