Negative Test : Add invalid s_hash to ID token

Thus create a failcase to check that the client calls the token endpoint with invalid s_hash

Implement a runinbackground() call so that the test suite passes.

Closes #416 (closed)

src/main/java/io/fintechlabs/testframework/condition/as/AddInvalidSHashValueToIdToken.java

+package io.fintechlabs.testframework.condition.as;
+
+import com.google.gson.JsonObject;
+import io.fintechlabs.testframework.condition.AbstractCondition;
+import io.fintechlabs.testframework.condition.PostEnvironment;
+import io.fintechlabs.testframework.condition.PreEnvironment;
+import io.fintechlabs.testframework.logging.TestInstanceEventLog;
+import io.fintechlabs.testframework.testmodule.Environment;
+
+public class AddInvalidSHashValueToIdToken extends AbstractCondition {
+
+	public AddInvalidSHashValueToIdToken(String testId, TestInstanceEventLog log, ConditionResult conditionResultOnFailure, String... requirements) {
+		super(testId, log, conditionResultOnFailure, requirements);
+	}
+
+	@Override
+	@PreEnvironment(required = "id_token_claims", strings = "s_hash")
+	@PostEnvironment(required = "id_token_claims")
+	public Environment evaluate(Environment env) {
+
+		JsonObject claims = env.getObject("id_token_claims");
+
+		String hash = env.getString("s_hash");
+
+		//Add number 1 onto end of hash string
+		String concat = (hash + 1);
+
+		claims.addProperty("s_hash", concat);
+
+		env.putObject("id_token_claims", claims);
+
+		logSuccess("Added invalid s_hash to ID token claims", args("id_token_claims", claims, "s_hash", concat));
+
+		return env;
+
+	}
+
+}