@Test
  public void testAllowValuesDisallowsFlagDefaultButNoPolicyDefault() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getAllowValuesBuilder()
        // default value from flag's definition is not allowed, and no alternate default
        // is given.
        .addAllowedValues("foo")
        .addAllowedValues("bar");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    // Option should be its default
    TestOptions testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);

    try {
      enforcer.enforce(parser, "build");
      fail();
    } catch (OptionsParsingException e) {
      // expected.
    }
  }
  @Test
  public void testUseDefaultWithImplicitlyRequiredFlags() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("an_implicit_requirement")
        .getUseDefaultBuilder();

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse(
        "--test_implicit_requirement=user value", "--an_implicit_requirement=implicit user value");

    // test_implicit_requirement sets an_implicit_requirement to "foo", which ignores the user's
    // value because the parser processes implicit values last.
    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testImplicitRequirement);
    assertEquals("foo", testOptions.anImplicitRequirement);

    // Then policy puts an_implicit_requirement back to its default.
    enforcer.enforce(parser, "build");

    testOptions = getTestOptions();
    assertEquals("user value", testOptions.testImplicitRequirement);
    assertEquals("implicit default", testOptions.anImplicitRequirement);
  }
  /**
   * Tests that policy overrides the default value when the flag allows multiple values and the user
   * doesn't provide a value.
   */
  @Test
  public void testSetValueWithMultipleValuesOverridesDefault() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_multiple_string")
        .getSetValueBuilder()
        .addFlagValue("policy value 1")
        .addFlagValue("policy value 2");

    // No user value.
    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    // Repeatable flags always default to the empty list.
    TestOptions testOptions = getTestOptions();
    assertThat(testOptions.testMultipleString).isEmpty();

    enforcer.enforce(parser, "build");

    // Options should now be the values from the policy.
    testOptions = getTestOptions();
    assertThat(testOptions.testMultipleString)
        .containsExactly("policy value 1", "policy value 2")
        .inOrder();
  }
  @Test
  public void testNonExistantFlagFromPolicy() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("i_do_not_exist")
        .getSetValueBuilder()
        .addFlagValue("policy value 1");
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getSetValueBuilder()
        .addFlagValue("policy value 2");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=user value");

    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);

    enforcer.enforce(parser, "test");

    // Still user value.
    testOptions = getTestOptions();
    assertEquals("policy value 2", testOptions.testString);
  }
  /** Tests that SetValue overrides the user's value when the flag allows multiple values. */
  @Test
  public void testSetValueWithMultipleValuesOverridesUser() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_multiple_string")
        .getSetValueBuilder()
        .addFlagValue("policy value 1")
        .addFlagValue("policy value 2");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_multiple_string=user value 1", "--test_multiple_string=user value 2");

    // Options should not be modified by running the parser through OptionsPolicyEnforcer.create().
    TestOptions testOptions = getTestOptions();
    assertThat(testOptions.testMultipleString)
        .containsExactly("user value 1", "user value 2")
        .inOrder();
    // assertEquals(, testOptions.test_multiple_string);

    enforcer.enforce(parser, "build");

    // Get the options again after policy enforcement.
    testOptions = getTestOptions();
    assertThat(testOptions.testMultipleString)
        .containsExactly("policy value 1", "policy value 2")
        .inOrder();
  }
  @Test
  public void testUseDefaultWithExpansionFlags() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_expansion_b")
        .getUseDefaultBuilder();

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_expansion");

    // --test_expansion should turn on test_expansion a, b, and c
    TestOptions testOptions = getTestOptions();
    assertTrue(testOptions.testExpansionA);
    assertTrue(testOptions.testExpansionB);
    assertTrue(testOptions.testExpansionC);

    enforcer.enforce(parser, "build");

    // After policy enforcement, test_expansion_b should be back to its default (false), but the
    // other two should remain the same.
    testOptions = getTestOptions();
    assertTrue(testOptions.testExpansionA);
    assertFalse(testOptions.testExpansionB);
    assertTrue(testOptions.testExpansionC);
  }
  @Test
  public void testAllowValuesDisallowsValue() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getAllowValuesBuilder()
        // no foo!
        .addAllowedValues(STRING_FLAG_DEFAULT)
        .addAllowedValues("bar");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=foo");

    // Option should be "foo" as specified by the user.
    TestOptions testOptions = getTestOptions();
    assertEquals("foo", testOptions.testString);

    try {
      // Should throw because "foo" is not allowed.
      enforcer.enforce(parser, "build");
      fail();
    } catch (OptionsParsingException e) {
      // expected
    }
  }
  @Test
  public void testOperationNotSet() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder.addFlagPoliciesBuilder();
    // No operations added to the flag policy

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=user value");

    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);

    // Shouldn't throw.
    enforcer.enforce(parser, "test");

    // Still user value.
    testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);
  }
  @Test
  public void testSetValueHasMultipleValuesButFlagIsNotMultiple() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string") // Not repeatable flag.
        .getSetValueBuilder()
        .addFlagValue("policy value 1") // Has multiple values.
        .addFlagValue("policy value 2");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    try {
      enforcer.enforce(parser, "build");
      fail();
    } catch (OptionsParsingException e) {
      // expected.
    }
  }
  /** Tests UseDefault when the user never actually specified the flag. */
  @Test
  public void testUseDefaultWhenFlagWasntSet() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getUseDefaultBuilder();

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    // Options should be the default since the user never specified it.
    TestOptions testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);

    enforcer.enforce(parser, "build");

    // Still the default.
    testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);
  }
  /** Tests that policy overrides a value when that value is from the user. */
  @Test
  public void testSetValueOverridesUser() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getSetValueBuilder()
        .addFlagValue("policy value");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=user value");

    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);

    enforcer.enforce(parser, "build");

    // Get the options again after policy enforcement.
    testOptions = getTestOptions();
    assertEquals("policy value", testOptions.testString);
  }
  /**
   * ***********************************************************************************************
   * Other tests
   * **********************************************************************************************
   */
  @Test
  public void testFlagPolicyDoesNotApply() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .addCommands("build")
        .getSetValueBuilder()
        .addFlagValue("policy value");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=user value");

    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);

    enforcer.enforce(parser, "test");

    // Still user value.
    testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);
  }
  @Test
  public void testDisallowValuesSetsNewDefaultWhenFlagDefaultIsDisallowed() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getDisallowValuesBuilder()
        .addDisallowedValues(STRING_FLAG_DEFAULT)
        .setNewDefaultValue("baz");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    // Option should be the default since the use didn't specify a value.
    TestOptions testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);

    enforcer.enforce(parser, "build");

    // Should now be "baz" because the policy set the new default to "baz"
    testOptions = getTestOptions();
    assertEquals("baz", testOptions.testString);
  }
  @Test
  public void testSetValueWithNoValueThrows() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getSetValueBuilder(); // No value.

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=user value");

    // Repeatable flags always default to the empty list.
    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);

    try {
      enforcer.enforce(parser, "build");
      fail();
    } catch (OptionsParsingException e) {
      // expected.
    }
  }
  /**
   * Tests that policy overrides a value when the user doesn't specify the value (i.e., the value is
   * from the flag's default from its definition).
   */
  @Test
  public void testSetValueOverridesDefault() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getSetValueBuilder()
        .addFlagValue("policy value");

    // No user value.
    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    // All the flags should be their default value.
    TestOptions testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);

    enforcer.enforce(parser, "build");

    // Get the options again after policy enforcement.
    testOptions = getTestOptions();
    assertEquals("policy value", testOptions.testString);
  }
  /**
   * ***********************************************************************************************
   * Tests for UseDefault
   * **********************************************************************************************
   */
  @Test
  public void testUseDefault() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getUseDefaultBuilder();

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=user value");

    // Options should be the user specified value before enforcing policy.
    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);

    enforcer.enforce(parser, "build");

    // Get the options again after policy enforcement: The flag should now be back to its default
    // value
    testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);
  }
  @Test
  public void testSetValueWithImplicitlyRequiredFlags() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("an_implicit_requirement")
        .getSetValueBuilder()
        .addFlagValue("policy value");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_implicit_requirement=user value");

    // test_implicit_requirement sets an_implicit_requirement to "foo"
    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testImplicitRequirement);
    assertEquals("foo", testOptions.anImplicitRequirement);

    enforcer.enforce(parser, "build");

    testOptions = getTestOptions();
    assertEquals("user value", testOptions.testImplicitRequirement);
    assertEquals("policy value", testOptions.anImplicitRequirement);
  }
  @Test
  public void testDisallowValuesDisallowsFlagDefaultButNoPolicyDefault() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getDisallowValuesBuilder()
        // No new default is set
        .addDisallowedValues(STRING_FLAG_DEFAULT);

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    // Option should be the default since the use didn't specify a value.
    TestOptions testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);

    try {
      enforcer.enforce(parser, "build");
      fail();
    } catch (OptionsParsingException e) {
      // expected.
    }
  }
  /**
   * ***********************************************************************************************
   * Tests for DisallowValues
   * **********************************************************************************************
   */
  @Test
  public void testDisallowValuesAllowsValue() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getDisallowValuesBuilder()
        .addDisallowedValues("foo")
        .addDisallowedValues("bar");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=baz");

    // Option should be "baz" as specified by the user.
    TestOptions testOptions = getTestOptions();
    assertEquals("baz", testOptions.testString);

    enforcer.enforce(parser, "build");

    // Still "baz" since "baz" is allowed by the policy.
    testOptions = getTestOptions();
    assertEquals("baz", testOptions.testString);
  }
  @Test
  public void testSetValueOverridable() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getSetValueBuilder()
        .addFlagValue("policy value")
        .setOverridable(true);

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=user value");

    // Repeatable flags always default to the empty list.
    TestOptions testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);

    enforcer.enforce(parser, "build");

    // Even though the policy sets the value for test_string, the policy is overridable and the
    // user set the value, so it should be the user's value.
    testOptions = getTestOptions();
    assertEquals("user value", testOptions.testString);
  }
  @Test
  public void testDisallowValuesDisallowsMultipleValues() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_multiple_string")
        .getDisallowValuesBuilder()
        .addDisallowedValues("foo")
        .addDisallowedValues("bar");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_multiple_string=baz", "--test_multiple_string=bar");

    // Option should be "baz" and "bar" as specified by the user.
    TestOptions testOptions = getTestOptions();
    assertThat(testOptions.testMultipleString).containsExactly("baz", "bar").inOrder();

    try {
      enforcer.enforce(parser, "build");
      fail();
    } catch (OptionsParsingException e) {
      // expected, since bar is disallowed.
    }
  }
  @Test
  public void testDisallowValuesDisallowsValue() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getDisallowValuesBuilder()
        .addDisallowedValues("foo")
        .addDisallowedValues("bar");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);
    parser.parse("--test_string=foo");

    // Option should be "foo" as specified by the user.
    TestOptions testOptions = getTestOptions();
    assertEquals("foo", testOptions.testString);

    try {
      enforcer.enforce(parser, "build");
      fail();
    } catch (OptionsParsingException e) {
      // expected, since foo is disallowed.
    }
  }
  /**
   * Tests that AllowValues sets its default value when the user doesn't provide a value and the
   * flag's default value is disallowed.
   */
  @Test
  public void testAllowValuesSetsNewDefaultWhenFlagDefaultIsDisallowed() throws Exception {
    InvocationPolicy.Builder invocationPolicyBuilder = InvocationPolicy.newBuilder();
    invocationPolicyBuilder
        .addFlagPoliciesBuilder()
        .setFlagName("test_string")
        .getAllowValuesBuilder()
        // default value from flag's definition is not allowed
        .addAllowedValues("foo")
        .addAllowedValues("bar")
        .setNewDefaultValue("new default");

    InvocationPolicyEnforcer enforcer = createOptionsPolicyEnforcer(invocationPolicyBuilder);

    // Option should be its default
    TestOptions testOptions = getTestOptions();
    assertEquals(STRING_FLAG_DEFAULT, testOptions.testString);

    enforcer.enforce(parser, "build");

    // Flag's value should be the default value from the policy.
    testOptions = getTestOptions();
    assertEquals("new default", testOptions.testString);
  }
  private static InvocationPolicyEnforcer createOptionsPolicyEnforcer(
      InvocationPolicy.Builder invocationPolicyBuilder) throws Exception {
    InvocationPolicy policyProto = invocationPolicyBuilder.build();

    // An OptionsPolicyEnforcer could be constructed in the test directly from the InvocationPolicy
    // proto, however Blaze will actually take the policy as another flag with a Base64 encoded
    // binary proto and parse that, so exercise that code path in the test.

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    policyProto.writeTo(out);
    String policyBase64 = BaseEncoding.base64().encode(out.toByteArray());

    OptionsParser startupOptionsParser =
        OptionsParser.newOptionsParser(BlazeServerStartupOptions.class);
    String policyOption = "--invocation_policy=" + policyBase64;
    startupOptionsParser.parse(policyOption);

    return InvocationPolicyEnforcer.create(startupOptionsParser);
  }