Added initial tests for dumpstate.

BUG: 31807540
Test: mmm -j32 frameworks/native/cmds/dumpstate/ && adb push ${ANDROID_PRODUCT_OUT}/data/nativetest/dumpstate_test* /data/nativetest && adb shell /data/nativetest/dumpstate_test/dumpstate_test

Change-Id: If5497784052b8d13d7c856f9400dbcd8c2015d05
diff --git a/cmds/dumpstate/tests/dumpstate_test.cpp b/cmds/dumpstate/tests/dumpstate_test.cpp
new file mode 100644
index 0000000..9e59080
--- /dev/null
+++ b/cmds/dumpstate/tests/dumpstate_test.cpp
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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 "dumpstate.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <libgen.h>
+#include <unistd.h>
+
+#include <android-base/file.h>
+
+using ::testing::EndsWith;
+using ::testing::IsEmpty;
+using ::testing::StrEq;
+using ::testing::StartsWith;
+using ::testing::Test;
+using ::testing::internal::CaptureStderr;
+using ::testing::internal::CaptureStdout;
+using ::testing::internal::GetCapturedStderr;
+using ::testing::internal::GetCapturedStdout;
+
+// Not used on test cases yet...
+void dumpstate_board(void) {
+}
+
+class DumpstateTest : public Test {
+  public:
+    void SetUp() {
+        SetDryRun(false);
+    }
+
+    // Runs a command and capture `stdout` and `stderr`.
+    int RunCommand(const std::string& title, const std::vector<std::string>& fullCommand,
+                   const CommandOptions& options = CommandOptions::DEFAULT) {
+        CaptureStdout();
+        CaptureStderr();
+        int status = ds_.RunCommand(title, fullCommand, options);
+        out = GetCapturedStdout();
+        err = GetCapturedStderr();
+        return status;
+    }
+
+    // `stdout` and `stderr` from the last command ran.
+    std::string out, err;
+
+    std::string testPath = dirname(android::base::GetExecutablePath().c_str());
+    std::string simpleBin = testPath + "/../dumpstate_test_fixture/dumpstate_test_fixture";
+
+    void SetDryRun(bool dryRun) {
+        ds_.dryRun_ = dryRun;
+    }
+
+  private:
+    Dumpstate& ds_ = Dumpstate::GetInstance();
+};
+
+TEST_F(DumpstateTest, RunCommandNoArgs) {
+    EXPECT_EQ(-1, RunCommand("", {}));
+}
+
+TEST_F(DumpstateTest, RunCommandNoTitle) {
+    EXPECT_EQ(0, RunCommand("", {simpleBin}));
+    EXPECT_THAT(out, StrEq("stdout\n"));
+    EXPECT_THAT(err, StrEq("stderr\n"));
+}
+
+TEST_F(DumpstateTest, RunCommandWithTitle) {
+    EXPECT_EQ(0, RunCommand("I AM GROOT", {simpleBin}));
+    EXPECT_THAT(err, StrEq("stderr\n"));
+    // We don't know the exact duration, so we check the prefix and suffix
+    EXPECT_THAT(out, StartsWith("------ I AM GROOT (" + simpleBin + ") ------\nstdout\n------"));
+    EXPECT_THAT(out, EndsWith("s was the duration of 'I AM GROOT' ------\n"));
+}
+
+TEST_F(DumpstateTest, RunCommandRedirectStderr) {
+    EXPECT_EQ(
+        0, RunCommand("", {simpleBin}, CommandOptions::WithTimeout(10).RedirectStderr().Build()));
+    EXPECT_THAT(out, IsEmpty());
+    EXPECT_THAT(err, StrEq("stderr\nstdout\n"));
+}
+
+TEST_F(DumpstateTest, RunCommandWithOneArg) {
+    EXPECT_EQ(0, RunCommand("", {simpleBin, "one"}));
+    EXPECT_THAT(err, IsEmpty());
+    EXPECT_THAT(out, StrEq("one\n"));
+}
+
+TEST_F(DumpstateTest, RunCommandWithNoArgs) {
+    EXPECT_EQ(0, RunCommand("", {simpleBin, "one", "is", "the", "loniest", "number"}));
+    EXPECT_THAT(err, IsEmpty());
+    EXPECT_THAT(out, StrEq("one is the loniest number\n"));
+}
+
+TEST_F(DumpstateTest, RunCommandDryRun) {
+    SetDryRun(true);
+    EXPECT_EQ(0, RunCommand("I AM GROOT", {simpleBin}));
+    // We don't know the exact duration, so we check the prefix and suffix
+    EXPECT_THAT(out, StartsWith("------ I AM GROOT (" + simpleBin +
+                                ") ------\n\t(skipped on dry run)\n------"));
+    EXPECT_THAT(out, EndsWith("s was the duration of 'I AM GROOT' ------\n"));
+    EXPECT_THAT(err, IsEmpty());
+}
+
+TEST_F(DumpstateTest, RunCommandDryRunNoTitle) {
+    SetDryRun(true);
+    EXPECT_EQ(0, RunCommand("", {simpleBin}));
+    EXPECT_THAT(out, IsEmpty());
+    EXPECT_THAT(err, IsEmpty());
+}
+
+TEST_F(DumpstateTest, RunCommandDryRunAlways) {
+    SetDryRun(true);
+    EXPECT_EQ(0, RunCommand("", {simpleBin}, CommandOptions::WithTimeout(10).Always().Build()));
+    EXPECT_THAT(out, StrEq("stdout\n"));
+    EXPECT_THAT(err, StrEq("stderr\n"));
+}
+
+// TODO: add test for other scenarios:
+// - AsRoot()
+// - DropRoot
+// - WithLoggingMessage()
+// - command does not exist (invalid path)
+// - command times out
+// - command exits with a different value
+// - command is killed before timed out
+// - test progress
+
+// TODO: test DumpFile()