assertj-rx

Uses AssertJ's readable and expressive style to make test code intuitive, as shown in examples like `assertThat(observable.toBlocking()).completes().emitsSingleValue("hello")`.

Allows precise validation of error types with assertions like `failsWithError(IllegalArgumentException.class)`, enabling detailed failure condition checks.

Provides assertions for emitted values, including single values, multiple values, and exact sequences, helping ensure correct data flow in tests.

Extends the popular AssertJ library, reducing the learning curve for developers already familiar with its fluent assertion patterns.