Test fixes wrt #3406

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/databind/jsontype/PolymorphicDeserErrorHandlingTest.java

@@ -54,7 +54,7 @@ public void testUnknownClassAsSubtype() throws Exception
         ObjectReader reader = MAPPER.readerFor(BaseUnknownWrapper.class)
                 .without(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE);
         BaseUnknownWrapper w = reader.readValue(a2q
-                ("{'value':{'clazz':'com.foobar.Nothing'}}'"));
+                ("{'value':{'clazz':'com.foobar.Nothing'}}"));
         assertNotNull(w);
     }
 

src/test/java/com/fasterxml/jackson/databind/jsontype/TestPolymorphicWithDefaultImpl.java

@@ -268,7 +268,7 @@ public void testUnknownClassAsSubtype() throws Exception
         ObjectMapper mapper = new ObjectMapper();
         mapper.configure(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE, false);
         BaseWrapper w = mapper.readValue(a2q
-                ("{'value':{'clazz':'com.foobar.Nothing'}}'"),
+                ("{'value':{'clazz':'com.foobar.Nothing'}}"),
                 BaseWrapper.class);
         assertNotNull(w);
         assertNull(w.value);

src/test/java/com/fasterxml/jackson/databind/misc/TestBlocking.java

@@ -1,6 +1,6 @@
 package com.fasterxml.jackson.databind.misc;
 
-import java.io.*;
+import java.io.IOException;
 
 import org.junit.jupiter.api.Test;
 
@@ -24,7 +24,7 @@ public class TestBlocking
      * quite yet.
      */
     @Test
-    public void testEagerAdvance() throws IOException
+    public void testEagerAdvance() throws Exception
     {
         ObjectMapper mapper = jsonMapperBuilder()
                 .disable(DeserializationFeature.FAIL_ON_TRAILING_TOKENS)