Gradle api vs compile

app-build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.alaershov.gradletest"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation 'com.android.support:appcompat-v7:28.0.0'
    testImplementation 'junit:junit:4.12'

    implementation project(":presentation")

    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

domain-build.gradle

apply plugin: 'java-library'

dependencies {
}

DomainUnitTest.java

package com.alaershov.gradletest;

import com.alaershov.domain.Domain;
import org.junit.Test;

public class DomainUnitTest {

    @Test
    public void domain() {
        new Domain();
    }
}

presentation-build.gradle

apply plugin: 'java-library'

dependencies {
    api project(":domain")
}