Add test

src/main/java/org/opentripplanner/standalone/config/RouterConfig.java

@@ -150,6 +150,7 @@ public String toString() {
     // Print ONLY the values set, not default values
     return root.toPrettyString();
   }
+
   /**
    * Checks if any unknown or invalid properties were encountered while loading the configuration.
    */

src/main/java/org/opentripplanner/standalone/config/framework/json/ParameterBuilder.java

@@ -120,10 +120,6 @@ public Boolean asBoolean(boolean defaultValue) {
     return ofOptional(BOOLEAN, defaultValue, JsonNode::asBoolean);
   }
 
-  public Map<String, Boolean> asBooleanMap() {
-    return ofOptionalMap(BOOLEAN, JsonNode::asBoolean);
-  }
-
   /** @throws OtpAppException if parameter is missing. */
   public double asDouble() {
     return ofRequired(DOUBLE).asDouble();

src/test/java/org/opentripplanner/standalone/config/framework/json/NodeAdapterTest.java

@@ -23,6 +23,7 @@
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.opentripplanner._support.time.ZoneIds;
 import org.opentripplanner.framework.application.OtpAppException;
@@ -557,6 +558,33 @@ void unusedParams() {
     assertEquals("Unexpected config parameter: 'foo.b:false' in 'Test'", buf.toString());
   }
 
+  @Nested
+  class Validation {
+
+    @Test
+    void invalidProperties() {
+      // Given: two parameters a and b
+      NodeAdapter subject = newNodeAdapterForTest("{ foo : { a: true, b: false } }");
+
+      // When: Access ONLY parameter 'a', but not 'b'
+      subject.of("foo").asObject().of("a").asBoolean();
+
+      assertTrue(subject.hasInvalidProperties());
+    }
+
+    @Test
+    void valid() {
+      // Given: two parameters a and b
+      NodeAdapter subject = newNodeAdapterForTest("{ foo : { a: true, b: false } }");
+
+      var object = subject.of("foo").asObject();
+      object.of("a").asBoolean();
+      object.of("b").asBoolean();
+
+      assertFalse(subject.hasInvalidProperties());
+    }
+  }
+
   private static String unusedParams(NodeAdapter subject) {
     var buf = new StringBuilder();
     subject.logAllWarnings(m -> buf.append('\n').append(m));