Fixed broken code in test classes (missing imports, undefined variables).

src/test/resources/inspections/InstanceOf/InstanceOfAfter.java

@@ -1,4 +1,5 @@
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
 
 public class InstanceOf {
 
@@ -22,7 +23,7 @@ public class InstanceOf {
         assertThat(object).as("foo").isInstanceOf(Boolean.class).as("bar").isInstanceOf(Boolean.class);
         assertThat(object instanceof Boolean).as("foo").isEqualTo(Boolean.TRUE).as("bar").isEqualTo(false);
 
-        org.junit.Assert.assertThat(foo, null);
+        org.junit.Assert.assertThat(object, null);
         fail("oh no!");
     }
 }

src/test/resources/inspections/InstanceOf/InstanceOfBefore.java

@@ -1,4 +1,5 @@
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
 
 public class InstanceOf {
 
@@ -22,7 +23,7 @@ public class InstanceOf {
         assertThat(object instanceof Boolean).as("foo").isEqualTo(Boolean.TRUE).as("bar").isEqualTo(true);
         assertThat(object instanceof Boolean).as("foo").isEqualTo(Boolean.TRUE).as("bar").isEqualTo(false);
 
-        org.junit.Assert.assertThat(foo, null);
+        org.junit.Assert.assertThat(object, null);
         fail("oh no!");
     }
 }