Deprecate access to non-public Spec properties in spec filters

spec/core/integration/EnvSpec.js

@@ -913,6 +913,7 @@ describe('Env integration', function() {
     });
 
     env.configure({
+      random: false,
       specFilter: function(spec) {
         return /^first suite/.test(spec.getFullName());
       }
@@ -920,13 +921,44 @@ describe('Env integration', function() {
 
     await env.execute();
 
-    expect(calls.length).toEqual(2);
-    expect(calls).toEqual(
-      jasmine.arrayContaining(['first spec', 'second spec'])
-    );
+    expect(calls).toEqual(['first spec', 'second spec']);
     expect(suiteCallback).toHaveBeenCalled();
   });
 
+  it('reports a deprecation warning when a spec filter accesses private properties', async function() {
+    env.it('a spec', function() {});
+
+    const reporter = jasmine.createSpyObj('reporter', ['jasmineDone']);
+    env.addReporter(reporter);
+
+    env.configure({
+      random: false,
+      specFilter: function(spec) {
+        spec.result; // deprecated
+        spec.id; // not deprecated
+        spec.description; // not deprecated
+        spec.getPath(); // not deprecated
+        spec.getFullName(); // not deprecated
+        return true;
+      }
+    });
+
+    spyOn(console, 'error');
+    await env.execute();
+
+    expect(reporter.jasmineDone).toHaveBeenCalledWith(
+      jasmine.objectContaining({
+        deprecationWarnings: [
+          jasmine.objectContaining({
+            message: jasmine.stringContaining(
+              'Access to private Spec members (in this case `result`)'
+            )
+          })
+        ]
+      })
+    );
+  });
+
   it('Functions can be spied on and have their calls tracked', async function() {
     let originalFunctionWasCalled = false;
     const subject = {