added VisibleForTesting annotation

Author: slisaasquatch

src/main/java/com/saasquatch/jsonschemainferrer/JsonSchemaInferrer.java

@@ -25,6 +25,7 @@
 import com.fasterxml.jackson.databind.node.JsonNodeType;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.fasterxml.jackson.databind.node.ValueNode;
+import com.saasquatch.jsonschemainferrer.annotations.VisibleForTesting;
 
 /**
  * Infer JSON schema based on sample JSONs. This class is immutable and thread safe.
@@ -332,8 +333,8 @@ private void postProcessAnyOfs(@Nonnull Collection<ObjectNode> anyOfs) {
     anyOfs.add(combinedSimpleAnyOf);
   }
 
-  // Visible for testing
   @Nonnull
+  @VisibleForTesting
   String inferPrimitiveType(@Nonnull JsonNode sample, boolean allNumbersAreIntegers) {
     // Marker for whether the error is caused by a known type
     final JsonNodeType type = sample.getNodeType();

src/main/java/com/saasquatch/jsonschemainferrer/annotations/VisibleForTesting.java

@@ -0,0 +1,14 @@
+package com.saasquatch.jsonschemainferrer.annotations;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Indicates that an element is only visible for testing.
+ *
+ * @author sli
+ */
+@Retention(RetentionPolicy.SOURCE) // Only used for documentation
+public @interface VisibleForTesting {
+
+}