Fix a few missing 'fail()' on expected exceptions

moshi/src/test/java/com/squareup/moshi/JsonReaderTest.java

@@ -189,10 +189,12 @@ public final class JsonReaderTest {
   @Test public void emptyString() {
     try {
       new JsonReader("").beginArray();
+      fail();
     } catch (IOException expected) {
     }
     try {
       new JsonReader("").beginObject();
+      fail();
     } catch (IOException expected) {
     }
   }
@@ -200,6 +202,7 @@ public final class JsonReaderTest {
   @Test public void noTopLevelObject() {
     try {
       new JsonReader("true").nextBoolean();
+      fail();
     } catch (IOException expected) {
     }
   }

moshi/src/test/java/com/squareup/moshi/TypesTest.java

@@ -25,6 +25,7 @@ import org.junit.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.assertNull;
+import static org.junit.Assert.fail;
 
 public class TypesTest {
   @Test public void newParameterizedTypeWithoutOwner() throws Exception {
@@ -41,6 +42,7 @@ public class TypesTest {
     try {
       // D<A> is not allowed since D is not a static inner class.
       Types.newParameterizedTypeWithOwner(null, D.class, A.class);
+      fail();
     } catch (IllegalArgumentException expected) {
     }