1 files changed, 65 insertions, 0 deletions
diff --git a/vespalib/src/tests/metrics/stable_store_test.cpp b/vespalib/src/tests/metrics/stable_store_test.cpp
new file mode 100644
index 00000000000..cead112069f
--- /dev/null
+++ b/vespalib/src/tests/metrics/stable_store_test.cpp
@@ -0,0 +1,65 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+#include <vespa/vespalib/testkit/testapp.h>
+#include <vespa/vespalib/metrics/simple_metrics.h>
+#include <vespa/vespalib/metrics/simple_metrics_manager.h>
+#include <vespa/vespalib/metrics/stable_store.h>
+#include <vespa/vespalib/metrics/json_formatter.h>
+#include <stdio.h>
+#include <unistd.h>
+
+using namespace vespalib;
+using namespace vespalib::metrics;
+
+struct Foo {
+    int a;
+    char *p;
+    explicit Foo(int v) : a(v), p(nullptr) {}
+    bool operator==(const Foo &other) const {
+        return a == other.a;
+    }
+};
+
+TEST("require that stable_store works")
+{
+    vespalib::StableStore<Foo> bunch;
+    bunch.add(Foo(1));
+    bunch.add(Foo(2));
+    bunch.add(Foo(3));
+    bunch.add(Foo(5));
+    bunch.add(Foo(8));
+    bunch.add(Foo(13));
+    bunch.add(Foo(21));
+    bunch.add(Foo(34));
+    bunch.add(Foo(55));
+    bunch.add(Foo(89));
+
+    EXPECT_EQUAL(bunch.size(), 10u);
+
+    int sum = 0;
+
+    bunch.for_each([&sum](const Foo& value) { sum += value.a; });
+    EXPECT_EQUAL(231, sum);
+
+    std::vector<const Foo *> pointers;
+    bunch.for_each([&pointers](const Foo& value)
+                   { pointers.push_back(&value); });
+    EXPECT_EQUAL(1, pointers[0]->a);
+    EXPECT_EQUAL(2, pointers[1]->a);
+    EXPECT_EQUAL(55, pointers[8]->a);
+    EXPECT_EQUAL(89, pointers[9]->a);
+
+    for (int i = 0; i < 20000; ++i) {
+        bunch.add(Foo(i));
+    }
+    bunch.for_each([&sum](const Foo& value) { sum -= value.a; });
+    EXPECT_EQUAL(-199990000, sum);
+
+    std::vector<const Foo *> after;
+    bunch.for_each([&after](const Foo& value)
+                   { if (after.size() < 10) after.push_back(&value); });
+
+    EXPECT_EQUAL(pointers[0], after[0]);
+    EXPECT_EQUAL(pointers[9], after[9]);
+}
+
+TEST_MAIN() { TEST_RUN_ALL(); }