try {
      collection.add(sampleElement);
      fail("add succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }

    assertCollectionsAreEquivalent(copy, collection);

    try {
      collection.addAll(siblingCollection);
      fail("addAll succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }

    try {
      collection.add(sampleElement);
      fail("add succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }

    assertCollectionsAreEquivalent(copy, collection);

    try {
      collection.addAll(siblingCollection);
      fail("addAll succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }

		edata   []byte
		cred    auth.Credentials
		success bool
	}{
		{edata1, cred1, true},
		{edata2, cred2, true},
		{data, cred1, false},
	}

	for _, test := range tests {
		t.Run("", func(t *testing.T) {
			ddata, err := madmin.DecryptData(test.cred.String(), bytes.NewReader(test.edata))
			if err != nil && test.success {
				t.Errorf("Expected success, saw failure %v", err)
			}
			if err == nil && !test.success {

        @Test
        @DisplayName("should create empty result")
        void shouldCreateEmptyResult() {
            UpgradeResult result = UpgradeResult.empty();

            assertTrue(result.success(), "Empty result should be successful");
            assertEquals(0, result.processedCount(), "Empty result should have no processed POMs");

			name:   "create key as user with no resources specified want success",
			method: http.MethodPost,
			path:   kmsKeyCreatePath,
			query:  map[string]string{"key-id": "new-test-key"},
			asRoot: false,

			policy: `{"Effect": "Allow",
				"Action": ["kms:CreateKey"] }`,

			wantStatusCode: http.StatusOK,
		},
		{
			name:   "create key as user set policy to allow want success",
			method: http.MethodPost,

func TestValidRegion(t *testing.T) {
	tests := []struct {
		name    string
		success bool
	}{
		{name: "us-east-1", success: true},
		{name: "us_east", success: true},
		{name: "helloWorld", success: true},
		{name: "-fdslka", success: false},
		{name: "^00[", success: false},
		{name: "my region", success: false},
		{name: "%%$#!", success: false},
	}

	for _, test := range tests {

			if err != nil && testCase.success {
				t.Errorf("Test %q: Expected success, but got error %s instead", testCase.desc, err)
			}
			if err == nil && !testCase.success {
				t.Errorf("Test %q: Expected error, but got success", testCase.desc)
			}
		})
	}

type NetLocker interface {
	// Do read lock for given LockArgs.  It should return
	// * a boolean to indicate success/failure of the operation
	// * an error on failure of lock request operation.
	RLock(ctx context.Context, args LockArgs) (bool, error)

	// Do write lock for given LockArgs. It should return
	// * a boolean to indicate success/failure of the operation
	// * an error on failure of lock request operation.

public class Result<T> {

    /**
     * Success without warnings
     *
     * @param model
     */
    public static <T> Result<T> success(T model) {
        return success(model, Collections.emptyList());
    }

    /**
     * Success with warnings
     *
     * @param model
     * @param problems
     */
    public static <T> Result<T> success(T model, Iterable<? extends ModelProblem> problems) {

			if err != nil && testCase.success {
				t.Fatalf("Test %d: unexpected error: %v", i+1, err)
			}
			_, _, err = createServerEndpoints(testCase.serverAddr, srvCtxt.Layout.pools, srvCtxt.Layout.legacy)
			if err != nil && testCase.success {
				t.Errorf("Test %d: Expected success but failed instead %s", i+1, err)
			}
			if err == nil && !testCase.success {