1 files changed, 57 insertions, 0 deletions
diff --git a/vespalib/src/tests/rusage/rusage_test.cpp b/vespalib/src/tests/rusage/rusage_test.cpp
new file mode 100644
index 00000000000..7e30f3b968b
--- /dev/null
+++ b/vespalib/src/tests/rusage/rusage_test.cpp
@@ -0,0 +1,57 @@
+// 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/util/rusage.h>
+
+using namespace vespalib;
+
+TEST("testRUsage")
+{
+    RUsage r1;
+    EXPECT_EQUAL("", r1.toString());
+    RUsage r2;
+    EXPECT_EQUAL(r2.toString(), r1.toString());
+    RUsage diff = r2-r1;
+    EXPECT_EQUAL(diff.toString(), r2.toString());
+    {
+        RUsage then = RUsage::createSelf(steady_time(7ns));
+        RUsage now = RUsage::createSelf();
+        EXPECT_NOT_EQUAL(now.toString(), then.toString());
+    }
+    {
+        RUsage then = RUsage::createChildren(steady_time(1337583ns));
+        RUsage now = RUsage::createChildren();
+        EXPECT_NOT_EQUAL(now.toString(), then.toString());
+    }
+    {
+        timeval a, b, c, d, r;
+        a.tv_usec = 7;
+        a.tv_sec = 7;
+        b.tv_usec = 7;
+        b.tv_sec = 7;
+        c.tv_usec = 1;
+        c.tv_sec = 8;
+        d.tv_usec = 9;
+        d.tv_sec = 4;
+        r = a - b;
+        EXPECT_EQUAL(0, r.tv_sec);
+        EXPECT_EQUAL(0, r.tv_usec);
+        r = b - a;
+        EXPECT_EQUAL(0, r.tv_sec);
+        EXPECT_EQUAL(0, r.tv_usec);
+        r = a - c;
+        EXPECT_EQUAL(-1, r.tv_sec);
+        EXPECT_EQUAL( 6, r.tv_usec);
+        r = c - a;
+        EXPECT_EQUAL(0, r.tv_sec);
+        EXPECT_EQUAL(999994, r.tv_usec);
+        r = a - d;
+        EXPECT_EQUAL(2, r.tv_sec);
+        EXPECT_EQUAL(999998, r.tv_usec);
+        r = d - a;
+        EXPECT_EQUAL(-3, r.tv_sec);
+        EXPECT_EQUAL( 2, r.tv_usec);
+    }
+}
+
+TEST_MAIN() { TEST_RUN_ALL(); }