fix: test for invalid schema in examples

lib/response-generator/index.js

@@ -8,9 +8,10 @@ class ResponseGenerator {
 			return schemaResponse.example;
 
 		if(schemaResponse.examples && Object.values(schemaResponse.examples).length) {
-			if(preferredExampleName && schemaResponse.examples[preferredExampleName])
-				return schemaResponse.examples[preferredExampleName].value || Object.values(schemaResponse.examples)[0].value;
-			return Object.values(schemaResponse.examples)[0].value;
+			if(preferredExampleName && schemaResponse.examples[preferredExampleName] && schemaResponse.examples[preferredExampleName].value)
+				return schemaResponse.examples[preferredExampleName].value
+			if(Object.values(schemaResponse.examples)[0].value)
+				return Object.values(schemaResponse.examples)[0].value;
 		}
 
 		if(schemaResponse.enum && schemaResponse.enum.length)

tests/response-generator/index.js

@@ -42,6 +42,42 @@ describe('Response Generator', () => {
 			});
 		});
 
+		it('Should throw if examples is defined but example has no value', () => {
+
+			const responseSchema = {
+				examples: {
+					first: {
+						foo: 'bar'
+					}
+				}
+			};
+
+			assert.throws(() => ResponseGenerator.generate(responseSchema));
+		});
+
+
+		it('Should return the first example if examples is defined & preferred example value undefined', () => {
+
+			const responseSchema = {
+				examples: {
+					first: {
+						value: {
+							yes: 'no'
+						}
+					},
+					second: {
+						hello: 'goodbye'
+					},
+				}
+			};
+
+			const response = ResponseGenerator.generate(responseSchema, 'second');
+
+			assert.deepStrictEqual(response, {
+				yes: 'no'
+			});
+		});
+
 		it('Should return the preferred example if prefer header is set', () => {
 
 			const responseSchema = {