Add tests for validateProps function

packages/aws-cdk-lib/core/test/helpers-internal/validate-props.test.ts

@@ -0,0 +1,90 @@
+import { Construct } from 'constructs';
+import { ValidationError } from '../../lib/errors';
+import { validateProps, ValidationRule } from '../../lib/helpers-internal/validate-props';
+
+class MockConstruct extends Construct {
+  constructor() {
+    super(undefined as any, 'MockConstruct');
+  }
+}
+
+describe('validateProps', () => {
+  let mockScope: Construct;
+
+  beforeEach(() => {
+    mockScope = new MockConstruct();
+  });
+
+  it('should not throw an error when all validations pass', () => {
+    const props = { value: 5 };
+    const rules: ValidationRule<typeof props>[] = [
+      {
+        condition: (p) => p.value < 0,
+        message: (p) => `Value ${p.value} should be non-negative`,
+      },
+    ];
+
+    expect(() => validateProps(mockScope, 'TestClass', props, rules)).not.toThrow();
+  });
+
+  it('should throw a ValidationError when a validation fails', () => {
+    const props = { value: -5 };
+    const rules: ValidationRule<typeof props>[] = [
+      {
+        condition: (p) => p.value < 0,
+        message: (p) => `Value ${p.value} should be non-negative`,
+      },
+    ];
+
+    expect(() => validateProps(mockScope, 'TestClass', props, rules)).toThrow(ValidationError);
+  });
+
+  it('should include all failed validation messages in the error', () => {
+    const props = { value1: -5, value2: 15 };
+    const rules: ValidationRule<typeof props>[] = [
+      {
+        condition: (p) => p.value1 < 0,
+        message: (p) => `Value1 ${p.value1} should be non-negative`,
+      },
+      {
+        condition: (p) => p.value2 > 10,
+        message: (p) => `Value2 ${p.value2} should be 10 or less`,
+      },
+    ];
+
+    expect(() => validateProps(mockScope, 'TestClass', props, rules)).toThrow(ValidationError);
+    try {
+      validateProps(mockScope, 'TestClass', props, rules);
+    } catch (error) {
+      if (error instanceof ValidationError) {
+        expect(error.message).toBe(
+          'TestClass initialization failed due to the following validation error(s):\n' +
+          '- Value1 -5 should be non-negative\n' +
+          '- Value2 15 should be 10 or less',
+        );
+      }
+    }
+  });
+
+  it('should work with complex object structures', () => {
+    const props = { nested: { value: 'invalid' } };
+    const rules: ValidationRule<typeof props>[] = [
+      {
+        condition: (p) => p.nested.value !== 'valid',
+        message: (p) => `Nested value "${p.nested.value}" is not valid`,
+      },
+    ];
+
+    expect(() => validateProps(mockScope, 'TestClass', props, rules)).toThrow(ValidationError);
+    try {
+      validateProps(mockScope, 'TestClass', props, rules);
+    } catch (error) {
+      if (error instanceof ValidationError) {
+        expect(error.message).toBe(
+          'TestClass initialization failed due to the following validation error(s):\n' +
+          '- Nested value "invalid" is not valid',
+        );
+      }
+    }
+  });
+});