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public interface LogInListener {
    void logInSuccess(String email, String password);
    void logInFailure(Exception exception, String email, String password);
}

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class LogInModelTest : LogInListener {
    private lateinit var successTask: Task<AuthResult>
    private lateinit var failureTask: Task<AuthResult>

    @Mock
    private lateinit val mAuth: FirebaseAuth
    private lateinit var logInModel: LogInModel
    
    private var logInResult = UNDEF
    

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    @Before
    fun setUp() {
        MockitoAnnotations.initMocks(this)
        successTask = object : Task<AuthResult>() {
            override fun isComplete(): Boolean = true

            override fun isSuccessful(): Boolean = true
            // ...
            override fun addOnCompleteListener(executor: Executor,
                                onCompleteListener: OnCompleteListener<AuthResult>): Task<AuthResult> {

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    @Test
    fun logInSuccess_test() {
        val email = "cool@cool.com"
        val password = "123456"
        Mockito.`when`(mAuth!!.signInWithEmailAndPassword(email, password))
                .thenReturn(successTask)
        logInModel!!.logIn(email, password)
        assert(logInResult == SUCCESS)
    }

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    override fun logInSuccess(email: String, password: String) {
        logInResult = SUCCESS
    }

    override fun logInFailure(exception: Exception, email: String, password: String) {
        logInResult = FAILURE
    }
}

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class LogInModelTest : LogInListener {
    private lateinit var successTask: Task<AuthResult>
    private lateinit var failureTask: Task<AuthResult>

    @Mock
    private lateinit val mAuth: FirebaseAuth
    private lateinit var logInModel: LogInModel
    
    private var logInResult = UNDEF
    

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    @Test
    fun logInFailure_test() {
        val email = "cool@cool.com"
        val password = "123_456"
        Mockito.`when`(mAuth!!.signInWithEmailAndPassword(email, password))
                .thenReturn(failureTask)
        accountModel!!.logIn(email, password)
        assert(logInResult == FAILURE)
    }

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from enum import Enum

class State(Enum):
  AIR = 0
  LAND = 1
  SEA = 2
  
myState = State.AIR

# Prints 0

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# In order formatting
# Hi, my name is Brett and I am writing on my Medium blog.
a = "Hi, my name is {} and I am writing on my {} blog.".format('Brett', 'Medium')

# Index formatting
# I'm going to a birthday party because it is Paul's birthday.
a = "I'm going to a {0} party because it is {1}'s {0}".format('birthday', 'Paul')

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from dataclasses import dataclass

# Define dataclass 
@dataclass
class Vector3D:
    x: int
    y: int
    z: int
      
# Create a vector