GROOVY-11151: Example in the Documentation of the Coercion Operator i…

…s Wrong

src/spec/doc/core-operators.adoc

@@ -816,15 +816,15 @@ being compatible for assignment. Let's take an example:
 ----
 include::{projectdir}/src/spec/test/OperatorsTest.groovy[tags=coerce_op_cast,indent=0]
 ----
-<1> `Integer` is not assignable to a `String`, so it will produce a `ClassCastException` at runtime
+<1> `String` is not assignable to an `Integer`, so it will produce a `ClassCastException` at runtime
 
 This can be fixed by using _coercion_ instead:
 
 [source,groovy]
 ----
 include::{projectdir}/src/spec/test/OperatorsTest.groovy[tags=coerce_op,indent=0]
 ----
-<1> `Integer` is not assignable to a `String`, but use of `as` will _coerce_ it to a `String`
+<1> `String` is not assignable to an `Integer`, but use of `as` will _coerce_ it to an `Integer`
 
 When an object is coerced into another, unless the target type is the same as the source type, coercion will return a
 *new* object. The rules of coercion differ depending on the source and target types, and coercion may fail if no conversion

src/spec/test/OperatorsTest.groovy

@@ -627,15 +627,17 @@ assert function(*args,5,6) == 26
     void testCoercionOperator() {
         try {
             // tag::coerce_op_cast[]
-            Integer x = 123
-            String s = (String) x                                   // <1>
+            String input = '42'
+            Integer num = (Integer) input                      // <1>
             // end::coerce_op_cast[]
+            assert false, 'Should not reach here but instead should have thrown a ClassCastException'
         } catch (ClassCastException e) {
+            assert e.message == "Cannot cast object '42' with class 'java.lang.String' to class 'java.lang.Integer'"
             // tag::coerce_op[]
-            Integer x = 123
-            String s = x as String                                  // <1>
+            String input = '42'
+            Integer num = input as Integer                      // <1>
             // end::coerce_op[]
-            assert s == '123'
+            assert num == 42
         }
         assertScript '''
         // tag::coerce_op_custom[]