TestObserver (RxJava Javadoc 2.2.21)

java.lang.Object
- io.reactivex.observers.BaseTestConsumerTestObserver>
- - io.reactivex.observers.TestObserver

Type Parameters:

T - the value type

All Implemented Interfaces:

CompletableObserver, Disposable, MaybeObserver, Observer, SingleObserver
```
public class TestObserver
extends BaseTestConsumerTestObserver>
implements Observer, Disposable, MaybeObserver, SingleObserver, CompletableObserver
```
An Observer that records events and allows making assertions about them.
You can override the onSubscribe, onNext, onError, onComplete, onSuccess and cancel methods but not the others (this is by design).
The TestObserver implements Disposable for convenience where dispose calls cancel.

Nested Class Summary
- Nested classes/interfaces inherited from class io.reactivex.observers.BaseTestConsumer
  BaseTestConsumer.TestWaitStrategy

Field Summary
- Fields inherited from class io.reactivex.observers.BaseTestConsumer
  checkSubscriptionOnce, completions, done, errors, establishedFusionMode, initialFusionMode, lastThread, tag, timeout, values

Constructor Summary

Constructors
Constructor and Description

TestObserver()
Constructs a non-forwarding TestObserver.

TestObserver(ObserverT> downstream)
Constructs a forwarding TestObserver.

Constructors
Constructor and Description
`TestObserver()` Constructs a non-forwarding TestObserver.
`TestObserver(ObserverT> downstream)` Constructs a forwarding TestObserver.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`TestObserver<T>`	`assertNotSubscribed()` Assert that the onSubscribe method hasn't been called at all.
`TestObserver<T>`	`assertOf(ConsumerTestObserver<T>> check)` Run a check consumer with this TestObserver instance.
`TestObserver<T>`	`assertSubscribed()` Assert that the onSubscribe method was called exactly once.
`void`	`cancel()` Cancels the TestObserver (before or after the subscription happened).
`static TestObserver`	`create()` Constructs a non-forwarding TestObserver.
`static TestObserver`	`create(Observer delegate)` Constructs a forwarding TestObserver.
`void`	`dispose()` Dispose the resource, the operation should be idempotent.
`boolean`	`hasSubscription()` Returns true if this TestObserver received a subscription.
`boolean`	`isCancelled()` Returns true if this TestObserver has been cancelled.
`boolean`	`isDisposed()` Returns true if this resource has been disposed.
`void`	`onComplete()` Notifies the Observer that the `Observable` has finished sending push-based notifications.
`void`	`onError(Throwable t)` Notifies the Observer that the `Observable` has experienced an error condition.
`void`	`onNext(T t)` Provides the Observer with a new item to observe.
`void`	`onSubscribe(Disposable d)` Provides the Observer with the means of cancelling (disposing) the connection (channel) with the Observable in both synchronous (from within `Observer.onNext(Object)`) and asynchronous manner.
`void`	`onSuccess(T value)` Notifies the MaybeObserver with one item and that the `Maybe` has finished sending push-based notifications.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - TestObserver
```
public TestObserver()
```
    Constructs a non-forwarding TestObserver.
  - TestObserver
```
public TestObserver(ObserverT> downstream)
```
    Constructs a forwarding TestObserver.
    
    Parameters:
    
    downstream - the actual Observer to forward events to
- Method Detail
  - create
```
public static  TestObserver create()
```
    Constructs a non-forwarding TestObserver.
    
    Type Parameters:
    
    T - the value type received
    
    Returns:
    
    the new TestObserver instance
  - create
```
public static  TestObserver create(Observer delegate)
```
    Constructs a forwarding TestObserver.
    
    Type Parameters:
    
    T - the value type received
    
    Parameters:
    
    delegate - the actual Observer to forward events to
    
    Returns:
    
    the new TestObserver instance
  - onSubscribe
```
public void onSubscribe(Disposable d)
```
    Description copied from interface: Observer
    
    Provides the Observer with the means of cancelling (disposing) the connection (channel) with the Observable in both synchronous (from within Observer.onNext(Object)) and asynchronous manner.
    
    Specified by:
    
    onSubscribe in interface CompletableObserver
    
    Specified by:
    
    onSubscribe in interface MaybeObserver<T>
    
    Specified by:
    
    onSubscribe in interface Observer<T>
    
    Specified by:
    
    onSubscribe in interface SingleObserver<T>
    
    Parameters:
    
    d - the Disposable instance whose Disposable.dispose() can be called anytime to cancel the connection
  - onNext
```
public void onNext(T t)
```
    Description copied from interface: Observer
    
    Provides the Observer with a new item to observe.
    The Observable may call this method 0 or more times.
    The Observable will not call this method again after it calls either Observer.onComplete() or Observer.onError(java.lang.Throwable).
    
    Specified by:
    
    onNext in interface Observer<T>
    
    Parameters:
    
    t - the item emitted by the Observable
  - onError
```
public void onError(Throwable t)
```
    Description copied from interface: Observer
    
    Notifies the Observer that the Observable has experienced an error condition.
    If the Observable calls this method, it will not thereafter call Observer.onNext(T) or Observer.onComplete().
    
    Specified by:
    
    onError in interface CompletableObserver
    
    Specified by:
    
    onError in interface MaybeObserver<T>
    
    Specified by:
    
    onError in interface Observer<T>
    
    Specified by:
    
    onError in interface SingleObserver<T>
    
    Parameters:
    
    t - the exception encountered by the Observable
  - onComplete
```
public void onComplete()
```
    Description copied from interface: Observer
    
    Notifies the Observer that the Observable has finished sending push-based notifications.
    The Observable will not call this method if it calls Observer.onError(java.lang.Throwable).
    
    Specified by:
    
    onComplete in interface CompletableObserver
    
    Specified by:
    
    onComplete in interface MaybeObserver<T>
    
    Specified by:
    
    onComplete in interface Observer<T>
  - isCancelled
```
public final boolean isCancelled()
```
    Returns true if this TestObserver has been cancelled.
    
    Returns:
    
    true if this TestObserver has been cancelled
  - cancel
```
public final void cancel()
```
    Cancels the TestObserver (before or after the subscription happened).
    This operation is thread-safe.
    This method is provided as a convenience when converting Flowable tests that cancel.
  - dispose
```
public final void dispose()
```
    Description copied from interface: Disposable
    
    Dispose the resource, the operation should be idempotent.
    
    Specified by:
    
    dispose in interface Disposable
  - isDisposed
```
public final boolean isDisposed()
```
    Description copied from interface: Disposable
    
    Returns true if this resource has been disposed.
    
    Specified by:
    
    isDisposed in interface Disposable
    
    Returns:
    
    true if this resource has been disposed
  - hasSubscription
```
public final boolean hasSubscription()
```
    Returns true if this TestObserver received a subscription.
    
    Returns:
    
    true if this TestObserver received a subscription
  - assertSubscribed
```
public final TestObserver<T> assertSubscribed()
```
    Assert that the onSubscribe method was called exactly once.
    
    Specified by:
    
    assertSubscribed in class BaseTestConsumer<T,TestObserver<T>>
    
    Returns:
    
    this;
  - assertNotSubscribed
```
public final TestObserver<T> assertNotSubscribed()
```
    Assert that the onSubscribe method hasn't been called at all.
    
    Specified by:
    
    assertNotSubscribed in class BaseTestConsumer<T,TestObserver<T>>
    
    Returns:
    
    this;
  - assertOf
```
public final TestObserver<T> assertOf(ConsumerTestObserver<T>> check)
```
    Run a check consumer with this TestObserver instance.
    
    Parameters:
    
    check - the check consumer to run
    
    Returns:
    
    this
  - onSuccess
```
public void onSuccess(T value)
```
    Description copied from interface: MaybeObserver
    
    Notifies the MaybeObserver with one item and that the Maybe has finished sending push-based notifications.
    The Maybe will not call this method if it calls MaybeObserver.onError(java.lang.Throwable).
    
    Specified by:
    
    onSuccess in interface MaybeObserver<T>
    
    Specified by:
    
    onSuccess in interface SingleObserver<T>
    
    Parameters:
    
    value - the item emitted by the Maybe

Class TestObserver

Nested Class Summary

Nested classes/interfaces inherited from class io.reactivex.observers.BaseTestConsumer

Field Summary

Fields inherited from class io.reactivex.observers.BaseTestConsumer

Constructor Summary

Method Summary

Methods inherited from class io.reactivex.observers.BaseTestConsumer

Methods inherited from class java.lang.Object

Constructor Detail

TestObserver

TestObserver

Method Detail

create

create

onSubscribe

onNext

onError

onComplete

isCancelled

cancel

dispose

isDisposed

hasSubscription

assertSubscribed

assertNotSubscribed

assertOf

onSuccess