### Kotlin Truthish Detailed Error Message Example

Source: https://github.com/varabyte/truthish/blob/main/README.md

Illustrates a deliberately broken test case to demonstrate the detailed and helpful error messages generated by Truthish for collection mismatches. The output clearly identifies missing and extraneous elements, aiding in quick debugging.

```kotlin
@Test
fun testMapButIntentionallyBroken() {
    assertThat(listOf(1, 2, 3, 4, 5).map { square(it) })
        .containsExactly(1, 4, 9, 15, 26) // <-- Ooops, messed up 16 and 25 here
        .inOrder()
}
```

```text
A collection did not contain element(s)

Expected exactly all elements from: [ 1, 4, 9, 15, 26 ]
But was                           : [ 1, 4, 9, 16, 25 ]
Missing                           : [ 15, 26 ]
Extraneous                        : [ 16, 25 ]
```

--------------------------------

### Kotlin Truthish Basic Assertions

Source: https://github.com/varabyte/truthish/blob/main/README.md

Demonstrates fundamental assertion methods like `isTrue()`, `isFalse()`, `isEqualTo()`, `containsExactly()`, `assertWithMessage()`, and `assertThrows()` using Truthish in Kotlin tests. These examples cover boolean checks, value equality, collection contents, custom failure messages, and exception handling.

```kotlin
import com.varabyte.truthish.*

fun isEven(num: Int) = (num % 2) == 0
fun square(num: Int) = (num * num)

@Test
fun testEvenOdd() {
    assertThat(isEven(1234)).isTrue()
    assertThat(isEven(1235)).isFalse()
}

@Test
fun testSum() {
    val nums = listOf(1, 2, 3, 4, 5)
    assertThat(nums.sum()).isEqualTo(15)
}

@Test
fun testMap() {
    assertThat(listOf(1, 2, 3, 4, 5).map { square(it) })
        .containsExactly(1, 4, 9, 16, 25)
        .inOrder()
}

@Test
fun customMessage() {
    assertWithMessage("Unexpected list size")
        .that(listOf(1, 2, 3, 4, 5)).hasSize(5)
}

@Test
fun testDivideByZeroException() {
    val ex = assertThrows<ArithmeticException> {
        10 / 0
    }
    assertThat(ex.message).isEqualTo("/ by zero")
}
```

--------------------------------

### Configure Gradle to Access Truthish Snapshots

Source: https://github.com/varabyte/truthish/blob/main/README.md

This snippet demonstrates how to add the Sonatype snapshots repository to your `build.gradle.kts` file. This configuration allows Gradle to resolve and download snapshot versions of Truthish artifacts, specifically for the `com.varabyte.truthish` group, enabling testing of pre-release features or bug fixes.

```Gradle (Kotlin DSL)
repositories {
  mavenCentral()
  maven("https://central.sonatype.com/repository/maven-snapshots/") {
    mavenContent {
      includeGroup("com.varabyte.truthish")
      snapshotsOnly()
    }
  }
}
```

--------------------------------

### Kotlin Multiplatform Truthish Dependency Configuration

Source: https://github.com/varabyte/truthish/blob/main/README.md

Provides the `build.gradle.kts` configuration for including Truthish in a Kotlin multiplatform project. It specifies common test dependencies and demonstrates how to configure various target platforms such as JVM, JS, Wasm, Linux, macOS, Windows, Android, and iOS.

```kotlin
// build.gradle.kts
// Multiplatform

repositories {
    mavenCentral()
}

kotlin {
    jvm()
    js {
        browser()
        nodeJs()
    }
    wasmJs {
      browser()
      nodeJs()
      d8()
    }

    linuxArm64()
    linuxX64()
    macosArm64() // Mac M1+
    macosX64() // Mac Intel
    mingwX64() // Windows
    iosArm64() // iOS M1+
    iosX64() // iOS Intel
    iosSimulatorArm64()
    androidTarget()

    sourceSets {
        commonTest.dependencies {
            implementation("com.varabyte.truthish:truthish:1.0.3")
            implementation(kotlin("test"))
        }
    }
}
```

--------------------------------

### Kotlin Android Truthish Dependency Configuration

Source: https://github.com/varabyte/truthish/blob/main/README.md

Details how to include Truthish dependencies in an Android project's `build.gradle.kts`. It distinguishes between `testImplementation` for host-side tests (run on the development machine) and `androidTestImplementation` for device-side tests (run on an Android device or emulator).

```kotlin
// build.gradle.kts

repositories {
    mavenCentral()
}

android { /* ... */ }

dependencies {
    // ...

    // If used in tests that are run on the host (i.e. your dev machine)
    testImplementation("com.varabyte.truthish:truthish:1.0.3")

    // If used in tests that are run on the device
    androidTestImplementation("com.varabyte.truthish:truthish:1.0.3")
}
```

--------------------------------

### Kotlin Truthish Grouping Assertions with assertAll

Source: https://github.com/varabyte/truthish/blob/main/README.md

Shows how to use the `assertAll` function to group multiple assertions. This ensures that all checks run before any failures are reported, allowing for the collection of all errors from a single test block.

```kotlin
val person = Person("Alice", 30)
assertAll {
    that(person.name).isEqualTo("Bob")
    that(person.age).isEqualTo(45)
}
// The above will assert once, reporting both equality check failures
```

--------------------------------

### Kotlin JVM Truthish Dependency Configuration

Source: https://github.com/varabyte/truthish/blob/main/README.md

Shows the `build.gradle.kts` snippet for adding Truthish as a `testImplementation` dependency in a standard Kotlin JVM project. This configuration is suitable for projects targeting only the Java Virtual Machine.

```kotlin
// build.gradle.kts

repositories {
    mavenCentral()
}

dependencies {
    // ...

    testImplementation(kotlin("test"))
    testImplementation("com.varabyte.truthish:truthish:1.0.3")
}
```

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