+Test first: New Testcase for Issue #70

deepsampler-provider-guice/record/polymorphicSamplesCanBeRecordedAndLoaded.json

@@ -0,0 +1,18 @@
+{
+  "id" : "6ff9ee24-f86a-4b8e-becc-7e3c46dd6e45",
+  "sampleMethodToSampleMap" : {
+    "public de.ppi.deepsampler.provider.common.Animal de.ppi.deepsampler.provider.common.TestService.getAnimal()" : {
+      "callMap" : [ {
+        "parameter" : {
+          "args" : [ ]
+        },
+        "returnValue" : {
+          "@type" : "de.ppi.deepsampler.persistence.bean.DefaultPersistentBean",
+          "values" : {
+            "0$name" : "Porthos"
+          }
+        }
+      } ]
+    }
+  }
+}

deepsampler-provider/src/testFixtures/java/de/ppi/deepsampler/provider/common/Animal.java

@@ -0,0 +1,6 @@
+package de.ppi.deepsampler.provider.common;
+
+public interface Animal {
+
+    String getName();
+}

deepsampler-provider/src/testFixtures/java/de/ppi/deepsampler/provider/common/Dog.java

@@ -0,0 +1,19 @@
+package de.ppi.deepsampler.provider.common;
+
+public class Dog implements Animal {
+
+    private String name;
+
+    public Dog(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

deepsampler-provider/src/testFixtures/java/de/ppi/deepsampler/provider/common/SamplerAspectTest.java

@@ -1196,4 +1196,41 @@ public void mixPureJavaApiAndPersistenceApi() throws IOException {
         Files.delete(Paths.get(pathToFile));
     }
 
+
+    @Test
+    public void polymorphicSamplesCanBeRecordedAndLoaded() throws IOException {
+        // Ensure, that no Samples from previous tests exists...
+        Sampler.clear();
+
+        // GIVEN
+        final TestService testServiceSampler = Sampler.prepare(TestService.class);
+        Sample.of(testServiceSampler.getAnimal());
+
+        // make the method call that is recorded
+        getTestService().getAnimal();
+
+        // save the recorded sample to file...
+        final String pathToFile = "./record/polymorphicSamplesCanBeRecordedAndLoaded.json";
+        final PersistentSampleManager source = PersistentSampler.source(JsonSourceManager.builder().buildWithFile(pathToFile));
+        source.record();
+
+        // Reset SampleRepository to ensure that only deserialized samples will be used in the next steps...
+        assertFalse(SampleRepository.getInstance().isEmpty());
+        Sampler.clear();
+        assertTrue(SampleRepository.getInstance().isEmpty());
+
+        // deserialize the sample...
+        Sample.of(testServiceSampler.getAnimal());
+        source.load();
+
+        // THEN
+        assertFalse(SampleRepository.getInstance().isEmpty());
+        assertNotNull(getTestService().getAnimal());
+        // Although only the interface was declared in the sampled method, we expect to see the concrete return type Dog:
+        assertTrue(getTestService().getAnimal() instanceof Dog);
+        assertEquals("Porthos", getTestService().getAnimal().getName());
+
+        Files.delete(Paths.get(pathToFile));
+    }
+
 }

deepsampler-provider/src/testFixtures/java/de/ppi/deepsampler/provider/common/TestService.java

@@ -181,4 +181,8 @@ public Map<Integer, Integer> getMapOfIntegers() {
 
         return map;
     }
+
+    public Animal getAnimal() {
+        return new Dog("Porthos");
+    }
 }