Feat/environment variables in workflow (#6515)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/tests/unit_tests/app/test_variables.py

@@ -0,0 +1,91 @@
+import pytest
+from pydantic import ValidationError
+
+from core.app.segments import (
+    FloatVariable,
+    IntegerVariable,
+    SecretVariable,
+    SegmentType,
+    StringVariable,
+    factory,
+)
+
+
+def test_string_variable():
+    test_data = {'value_type': 'string', 'name': 'test_text', 'value': 'Hello, World!'}
+    result = factory.build_variable_from_mapping(test_data)
+    assert isinstance(result, StringVariable)
+
+
+def test_integer_variable():
+    test_data = {'value_type': 'number', 'name': 'test_int', 'value': 42}
+    result = factory.build_variable_from_mapping(test_data)
+    assert isinstance(result, IntegerVariable)
+
+
+def test_float_variable():
+    test_data = {'value_type': 'number', 'name': 'test_float', 'value': 3.14}
+    result = factory.build_variable_from_mapping(test_data)
+    assert isinstance(result, FloatVariable)
+
+
+def test_secret_variable():
+    test_data = {'value_type': 'secret', 'name': 'test_secret', 'value': 'secret_value'}
+    result = factory.build_variable_from_mapping(test_data)
+    assert isinstance(result, SecretVariable)
+
+
+def test_invalid_value_type():
+    test_data = {'value_type': 'unknown', 'name': 'test_invalid', 'value': 'value'}
+    with pytest.raises(ValueError):
+        factory.build_variable_from_mapping(test_data)
+
+
+def test_frozen_variables():
+    var = StringVariable(name='text', value='text')
+    with pytest.raises(ValidationError):
+        var.value = 'new value'
+
+    int_var = IntegerVariable(name='integer', value=42)
+    with pytest.raises(ValidationError):
+        int_var.value = 100
+
+    float_var = FloatVariable(name='float', value=3.14)
+    with pytest.raises(ValidationError):
+        float_var.value = 2.718
+
+    secret_var = SecretVariable(name='secret', value='secret_value')
+    with pytest.raises(ValidationError):
+        secret_var.value = 'new_secret_value'
+
+
+def test_variable_value_type_immutable():
+    with pytest.raises(ValidationError):
+        StringVariable(value_type=SegmentType.ARRAY, name='text', value='text')
+
+    with pytest.raises(ValidationError):
+        StringVariable.model_validate({'value_type': 'not text', 'name': 'text', 'value': 'text'})
+
+    var = IntegerVariable(name='integer', value=42)
+    with pytest.raises(ValidationError):
+        IntegerVariable(value_type=SegmentType.ARRAY, name=var.name, value=var.value)
+
+    var = FloatVariable(name='float', value=3.14)
+    with pytest.raises(ValidationError):
+        FloatVariable(value_type=SegmentType.ARRAY, name=var.name, value=var.value)
+
+    var = SecretVariable(name='secret', value='secret_value')
+    with pytest.raises(ValidationError):
+        SecretVariable(value_type=SegmentType.ARRAY, name=var.name, value=var.value)
+
+
+def test_build_a_blank_string():
+    result = factory.build_variable_from_mapping(
+        {
+            'value_type': 'string',
+            'name': 'blank',
+            'value': '',
+        }
+    )
+    assert isinstance(result, StringVariable)
+    assert result.value == ''