Slate Framework

1. Problem Statement

Larger programs often contain functions whose responsibilities overlap. Changes in one component may unexpectedly affect another. Code that relies on tightly connected objects can be difficult to test independently. Concurrent operations add further complexity when outcomes depend on execution order. Without explicit component boundaries and verification activities, understanding program behavior can require extensive manual investigation.

2. Solution

Slate Framework introduces methods for organizing components around defined responsibilities. Learners examine interfaces, dependency boundaries, and the movement of data between program layers. Guided tasks demonstrate how to write focused tests for ordinary and exceptional conditions. Asynchronous examples illustrate testing cancellation and state updates. A final workshop brings these ideas together in a modular Kotlin program with documented checks.

3. What's Inside

Module 1 — Mapping Program Responsibilities

Identify distinct tasks within a codebase. Group related operations into components and describe the information exchanged between them.

Module 2 — Defining Component Contracts

Use interfaces and data types to describe component behavior. Compare direct dependencies with boundaries that permit separate implementations.

Module 3 — Separating Logic From Coordination

Distinguish calculation rules from input handling and task coordination. Refactor a mixed routine into focused functions and classes.

Module 4 — Building Repeatable Tests

Write tests for function results, boundary inputs, and invalid values. Organize cases around observable behavior rather than implementation details.

Module 5 — Replacing External Dependencies in Tests

Create simple substitute implementations for data providers. Examine how controlled inputs make individual components practical to evaluate.

Module 6 — Checking Asynchronous Behavior

Test suspended operations, task cancellation, and state transitions. Trace when results appear and how failures affect related tasks.

Module 7 — Diagnostics and Error Records

Create structured error descriptions and diagnostic messages. Distinguish information useful for investigation from details unrelated to the observed issue.

Module 8 — Modular Application Workshop

Assemble a small task registry with separate data, rule, and coordination components. Add tests, review dependencies, and document remaining limitations.

4. Who Is This For?

Slate Framework is intended for learners already familiar with Kotlin classes, interfaces, collections, error handling, and coroutines. It suits readers who want to study modular organization and verification through concrete coding tasks.

5. What You'll Learn

• Divide program responsibilities into distinct components.

• Define interfaces for interaction between modules.

• Separate domain rules from coordination logic.

• Write tests for expected and exceptional outcomes.

• Use substitute implementations for isolated testing.

• Examine cancellation and state changes in asynchronous tests.

• Record errors with relevant diagnostic context.

• Review module dependencies and document design decisions.

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