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UseSumOfInsteadOfFlatMapSizeSpec.kt
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UseSumOfInsteadOfFlatMapSizeSpec.kt
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package io.gitlab.arturbosch.detekt.rules.style
import io.gitlab.arturbosch.detekt.rules.KotlinCoreEnvironmentTest
import io.gitlab.arturbosch.detekt.test.compileAndLintWithContext
import org.assertj.core.api.Assertions.assertThat
import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
import org.junit.jupiter.api.Test
@KotlinCoreEnvironmentTest
class UseSumOfInsteadOfFlatMapSizeSpec(val env: KotlinCoreEnvironment) {
val subject = UseSumOfInsteadOfFlatMapSize()
@Test
fun `reports flatMap and size`() {
val code = """
fun test(list: List<Foo>) {
list.flatMap { it.foo }.size
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).hasSize(1)
assertThat(actual[0].message).isEqualTo("Use 'sumOf' instead of 'flatMap' and 'size'")
}
@Test
fun `reports flatMap and count`() {
val code = """
fun test(list: List<Foo>) {
list.flatMap { it.foo }.count()
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).hasSize(1)
assertThat(actual[0].message).isEqualTo("Use 'sumOf' instead of 'flatMap' and 'count'")
}
@Test
fun `reports flatMap and count with a argument`() {
val code = """
fun test(list: List<Foo>) {
list.flatMap { it.foo }.count { it > 2 }
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).hasSize(1)
assertThat(actual[0].message).isEqualTo("Use 'sumOf' instead of 'flatMap' and 'count'")
}
@Test
fun `reports flatten and size`() {
val code = """
fun test(list: List<List<Int>>) {
list.flatten().size
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).hasSize(1)
assertThat(actual[0].message).isEqualTo("Use 'sumOf' instead of 'flatten' and 'size'")
}
@Test
fun `reports flatMap and size on nullable list`() {
val code = """
fun test(list: List<Foo>?) {
list?.flatMap { it.foo }?.size
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).hasSize(1)
}
@Test
fun `reports flatMap and size on implicit list receiver`() {
val code = """
fun List<Foo>.test() {
flatMap { it.foo }.size
sumOf { it.foo.size }
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).hasSize(1)
}
@Test
fun `reports flatMap and count on Set`() {
val code = """
fun test(set: Set<Bar>) {
set.flatMap { it.bar }.count()
}
class Bar(val bar: Set<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).hasSize(1)
}
@Test
fun `does not report flatMap`() {
val code = """
fun test(list: List<Foo>) {
list.flatMap { it.foo }
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).isEmpty()
}
@Test
fun `does not report flatMap and first`() {
val code = """
fun test(list: List<Foo>) {
list.flatMap { it.foo }.first()
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).isEmpty()
}
@Test
fun `does not report flatten`() {
val code = """
fun test(list: List<List<Int>>) {
list.flatten()
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).isEmpty()
}
@Test
fun `does not report flatten and last`() {
val code = """
fun test(list: List<List<Int>>) {
list.flatten().last()
}
class Foo(val foo: List<Int>)
""".trimIndent()
val actual = subject.compileAndLintWithContext(env, code)
assertThat(actual).isEmpty()
}
}