Fix undefined behaviour and memory issues

Author: kunitoki

tests/juce_core/juce_ReferenceCountedObject.cpp

@@ -74,7 +74,7 @@ TEST (ReferenceCountedObjectTests, DecReferenceCountWithoutDeleting)
     EXPECT_TRUE (obj->decReferenceCountWithoutDeleting());
     EXPECT_EQ (obj->getReferenceCount(), 0);
 
-    delete obj;
+    obj = nullptr;
 }
 
 TEST (ReferenceCountedObjectTests, DecConstReferenceCountWithoutDeleting)
@@ -85,7 +85,7 @@ TEST (ReferenceCountedObjectTests, DecConstReferenceCountWithoutDeleting)
     EXPECT_TRUE (obj->decReferenceCountWithoutDeleting());
     EXPECT_EQ (obj->getReferenceCount(), 0);
 
-    delete obj;
+    obj = nullptr;
 }
 
 // SingleThreadedReferenceCountedObject tests
@@ -125,7 +125,7 @@ TEST (SingleThreadedReferenceCountedObjectTests, DecReferenceCountWithoutDeletin
     EXPECT_TRUE (obj->decReferenceCountWithoutDeleting());
     EXPECT_EQ (obj->getReferenceCount(), 0);
 
-    delete obj;
+    obj = nullptr;
 }
 
 TEST (SingleThreadedReferenceCountedObjectTests, DecConstReferenceCountWithoutDeleting)
@@ -136,7 +136,7 @@ TEST (SingleThreadedReferenceCountedObjectTests, DecConstReferenceCountWithoutDe
     EXPECT_TRUE (obj->decReferenceCountWithoutDeleting());
     EXPECT_EQ (obj->getReferenceCount(), 0);
 
-    delete obj;
+    obj = nullptr;
 }
 
 // ReferenceCountedObjectPtr tests

tests/juce_core/juce_ZipFile.cpp

@@ -244,7 +244,7 @@ TEST_F (ZipFileTests, CreateStreamForEntryByName)
     ZipFile zip (zipFile);
 
     const ZipFile::ZipEntry* entry = zip.getEntry ("nonexistent.txt");
-    EXPECT_EQ (zip.createStreamForEntry (*entry), nullptr); // Assumes the test.zip does not contain this file
+    ASSERT_EQ (nullptr, entry);
 }
 
 TEST_F (ZipFileTests, UncompressTo)