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diff --git a/effcee/diagnostic_test.cc b/effcee/diagnostic_test.cc
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+// Copyright 2017 The Effcee Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "gmock/gmock.h"
+
+#include "diagnostic.h"
+
+namespace {
+
+using effcee::Diagnostic;
+using effcee::Result;
+using testing::Eq;
+
+using Status = effcee::Result::Status;
+
+// Check conversion preserves status.
+TEST(Diagnostic, ConvertsToResultWithSameOkStatus) {
+  const Diagnostic d(Status::Ok);
+  const Result r(d);
+  EXPECT_THAT(r.status(), Eq(Status::Ok));
+}
+
+TEST(Diagnostic, ConvertsToResultWithSameFailStatus) {
+  const Diagnostic d(Status::Fail);
+  const Result r(d);
+  EXPECT_THAT(r.status(), Eq(Status::Fail));
+}
+
+// Check conversion, with messages.
+
+TEST(Diagnostic, MessageDefaultsToEmpty) {
+  const Diagnostic d(Status::Ok);
+  const Result r(d);
+  EXPECT_THAT(r.message(), Eq(""));
+}
+
+TEST(Diagnostic, MessageAccumulatesValuesOfDifferentTypes) {
+  Diagnostic d(Status::Ok);
+  d << "hello" << ' ' << 42 << " and " << 32u << " and " << 1.25;
+  const Result r(d);
+  EXPECT_THAT(r.message(), Eq("hello 42 and 32 and 1.25"));
+}
+
+// Check copying
+
+TEST(Diagnostic, CopyRetainsOriginalMessage) {
+  Diagnostic d(Status::Ok);
+  d << "hello";
+  Diagnostic d2 = d;
+  const Result r(d2);
+  EXPECT_THAT(r.message(), Eq("hello"));
+}
+
+TEST(Diagnostic, ShiftOnCopyAppendsToOriginalMessage) {
+  Diagnostic d(Status::Ok);
+  d << "hello";
+  Diagnostic d2 = d;
+  d2 << " world";
+  const Result r(d2);
+  EXPECT_THAT(r.message(), Eq("hello world"));
+}
+
+
+}  // namespace