fix #1656: Add missing support for JSON values inside arrays in WireMockStub (#1764)

Fixes #1656.
Currently, numbers, booleans and null inside arrays are double-quoted
when converting dsl into stub, which results in generating incorrect
json stubs for WireMock. This commit fixes it.

spring-cloud-contract-verifier/src/main/java/org/springframework/cloud/contract/verifier/dsl/wiremock/BaseWireMockStubStrategy.java

@@ -95,8 +95,15 @@ abstract class BaseWireMockStubStrategy {
 	/**
 	 * For the given {@link ContentType} returns the Boolean version of the body.
 	 */
-	String parseBody(Boolean value, ContentType contentType) {
-		return value.toString();
+	Boolean parseBody(Boolean value, ContentType contentType) {
+		return value;
+	}
+
+	/**
+	 * For the given {@link ContentType} returns the Number version of the body.
+	 */
+	Number parseBody(Number value, ContentType contentType) {
+		return value;
 	}
 
 	/**
@@ -156,6 +163,15 @@ abstract class BaseWireMockStubStrategy {
 			else if (l instanceof List) {
 				result.add(parseBody((List<?>) l, contentType));
 			}
+			else if (l instanceof Boolean) {
+				result.add(parseBody((Boolean) l, contentType));
+			}
+			else if (l instanceof Number) {
+				result.add(parseBody((Number) l, contentType));
+			}
+			else if (l == null) {
+				result.add(null);
+			}
 			else {
 				result.add(parseBody(l, contentType));
 			}

spring-cloud-contract-verifier/src/test/groovy/org/springframework/cloud/contract/verifier/dsl/wiremock/WireMockResponseStubStrategySpec.groovy

@@ -18,7 +18,6 @@ package org.springframework.cloud.contract.verifier.dsl.wiremock
 
 import groovy.json.JsonSlurper
 import org.springframework.cloud.contract.spec.Contract
-import org.springframework.cloud.contract.verifier.converter.YamlContractConverter
 import org.springframework.cloud.contract.verifier.file.SingleContractMetadata
 import org.springframework.cloud.contract.verifier.util.ContentType
 import org.springframework.cloud.contract.verifier.util.MapConverter
@@ -95,6 +94,47 @@ class WireMockResponseStubStrategySpec extends Specification {
 			assert body.get("double") instanceof BigDecimal
 	}
 
+	@Issue("#1656")
+	def "should not quote numbers, booleans, and null inside arrays"() {
+		given:
+			def irrelevantStatus = 200
+			def contract = Contract.make {
+				request {
+					method GET()
+					url "/foo"
+				}
+				response {
+					status irrelevantStatus
+					body([
+							anyPositiveInt(),
+							anyInteger(),
+							true,
+							anyNumber(),
+							null,
+							"value"
+					])
+				}
+			}
+		when:
+			SingleContractMetadata metadata = Stub()
+			metadata.evaluatedOutputStubContentType >> ContentType.JSON
+			def subject = new WireMockResponseStubStrategy(contract, metadata) {
+				@Override
+				Function parsingClosureForContentType() {
+					return MapConverter.JSON_PARSING_FUNCTION
+				}
+			}
+			def content = subject.buildClientResponseContent()
+		then:
+			List body = new JsonSlurper().parseText(content.body) as List
+			assert body.getAt(0) instanceof Integer
+			assert body.getAt(1) instanceof Integer
+			assert body.getAt(2) instanceof Boolean
+			assert body.getAt(3) instanceof Number
+			assert body.getAt(4) == null
+			assert body.getAt(5) instanceof String
+	}
+
 	def "should convert patterns to proper value"() {
 		given:
 			def contract = Contract.make {