add test for unlink

test-src/integration/test_unlink.cpp

@@ -0,0 +1,44 @@
+#include "webfuse/webfuse.hpp"
+#include "webfuse/test/fixture.hpp"
+#include "webfuse/test/filesystem_mock.hpp"
+
+#include <gtest/gtest.h>
+
+using testing::_;
+using testing::Return;
+using testing::Invoke;
+using testing::AnyNumber;
+
+TEST(unlink, success)
+{
+    bool link_created = false;
+
+    webfuse::filesystem_mock fs;
+    EXPECT_CALL(fs, access("/",_)).Times(AnyNumber()).WillRepeatedly(Return(0));
+    EXPECT_CALL(fs, getattr(_,_)).WillRepeatedly(Invoke([&link_created](std::string const & path, struct stat * attr){
+        memset(reinterpret_cast<void*>(attr),0, sizeof(struct stat));
+
+        if (path == "/")
+        {
+            attr->st_nlink = 1;
+            attr->st_mode = S_IFDIR | 0755;
+            return 0;
+        }
+        if (path == "/some_file")
+        {
+            attr->st_nlink = 1;
+            attr->st_mode = S_IFREG | 0755;
+            return 0;
+        }
+        else
+        {
+            return -ENOENT;
+        }
+    }));
+    EXPECT_CALL(fs, unlink("/some_file")).WillOnce(Return(0));
+
+    webfuse::fixture fixture(fs);
+    auto const path = fixture.get_path() + "/some_file";
+
+    ASSERT_EQ(0, ::unlink(path.c_str()));
+}