diff --git a/tests/test_all_types.py b/tests/test_all_types.py
new file mode 100644
index 0000000..97880ea
--- /dev/null
+++ b/tests/test_all_types.py
@@ -0,0 +1,138 @@
+import pytest
+from pydantic import ValidationError, BaseModel, field_validator
+import jsonschema
+import requests
+
+from pytdml.type.all_types import _validate_date, to_camel, AI_Labeler
+
+base_url = "https://raw.githubusercontent.com/opengeospatial/TrainingDML-AI_SWG/main/schemas/1.0/json_schema/{}.json"
+
+
+class test_date_model(BaseModel):
+    date: str
+
+    @field_validator("date")
+    def validate_date(cls, v):
+        return _validate_date(v)
+
+
+# Test valid date-time format
+def test_validate_datetime_format():
+    valid_datetime = "2023-10-27T14:30:00"
+    result = _validate_date(valid_datetime)
+    assert result == valid_datetime
+
+
+# Test valid date format
+def test_validate_date_format():
+    valid_date = "2023-10-27"
+    result = _validate_date(valid_date)
+    assert result == valid_date
+
+
+# Test valid time format
+def test_validate_time_format():
+    valid_time = "14:30:00"
+    result = _validate_date(valid_time)
+    assert result == valid_time
+
+
+# Test valid year format
+def test_validate_year_format():
+    valid_year = "2023"
+    result = _validate_date(valid_year)
+    assert result == valid_year
+
+
+# Test valid year-month format
+def test_validate_year_month_format():
+    valid_year_month = "2023-10"
+    result = _validate_date(valid_year_month)
+    assert result == valid_year_month
+
+
+# Test invalid date format
+def test_invalid_format():
+    invalid_date = "2023/10/27"
+    data = {"date": invalid_date}
+    with pytest.raises(
+        ValidationError,
+        match=rf"String {invalid_date} does not match any allowed format",
+    ):
+        test_date_model(**data)
+
+
+# Test invalid date
+def test_invalid_date():
+    invalid_date = "2023-13-35"
+    data = {"date": invalid_date}
+    with pytest.raises(
+        ValidationError,
+        match=rf"String {invalid_date} does not match any allowed format",
+    ):
+        test_date_model(**data)
+
+
+# Test invalid time
+def test_invalid_time():
+    invalid_time = "25:70:70"
+    data = {"date": invalid_time}
+    with pytest.raises(
+        ValidationError,
+        match=rf"String {invalid_time} does not match any allowed format",
+    ):
+        test_date_model(**data)
+
+
+# Test invalid year
+def test_invalid_year():
+    invalid_year = "1800"
+    data = {"date": invalid_year}
+    with pytest.raises(
+        ValidationError,
+        match=rf"String {invalid_year} does not match any allowed format",
+    ):
+        test_date_model(**data)
+
+
+# Test invalid year-month
+def test_invalid_year_month():
+    invalid_year_month = "2023-15"
+    data = {"date": invalid_year_month}
+    with pytest.raises(
+        ValidationError,
+        match=rf"String {invalid_year_month} does not match any allowed format",
+    ):
+        test_date_model(**data)
+
+
+# Test to_camel
+def test_to_camel():
+    camel_string = "thisIsACamelString"
+    snake_string = "this_is_a_camel_string"
+    assert to_camel(snake_string) == camel_string
+
+
+# Test invalid Labeler
+def test_required_elements_with_Labeler():
+    data = {
+        "type": "AI_Labeler",
+        "name": "zhaoyan"
+    }
+    with pytest.raises( ValidationError):
+        AI_Labeler(**data)
+
+# Test valid Labeler and with remote schema
+def test_valid_Labeler_schema():
+    data = {
+        "type": "AI_Labeler",
+        "id": "1",
+        "name": "zhaoyan"
+    }
+    labeler = AI_Labeler(**data)
+
+    remote_schema_url = base_url.format("ai_labeler")
+    response = requests.get(remote_schema_url)
+    remote_schema = response.json()
+
+    jsonschema.validate(instance=labeler.model_dump(), schema=remote_schema)