ForbiddenMethodCallSpec.kt

package io.gitlab.arturbosch.detekt.rules.style

import io.gitlab.arturbosch.detekt.api.SourceLocation
import io.gitlab.arturbosch.detekt.rules.KotlinCoreEnvironmentTest
import io.gitlab.arturbosch.detekt.test.TestConfig
import io.gitlab.arturbosch.detekt.test.assertThat
import io.gitlab.arturbosch.detekt.test.compileAndLintWithContext
import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
import org.junit.jupiter.api.Nested
import org.junit.jupiter.api.Test

private const val METHODS = "methods"

@KotlinCoreEnvironmentTest
class ForbiddenMethodCallSpec(val env: KotlinCoreEnvironment) {

    @Test
    fun `should report kotlin print usages by default`() {
        val code = """
        fun main() {
            print("3")
            println("4")
        }
        """
        val findings = ForbiddenMethodCall(TestConfig()).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(2)
        assertThat(findings).hasSourceLocations(
            SourceLocation(2, 5),
            SourceLocation(3, 5)
        )
    }

    @Test
    fun `should report nothing when methods are blank`() {
        val code = """
        import java.lang.System
        fun main() {
            System.out.println("hello")
        }
        """
        val findings =
            ForbiddenMethodCall(TestConfig(mapOf(METHODS to "  "))).compileAndLintWithContext(
                env,
                code
            )
        assertThat(findings).isEmpty()
    }

    @Test
    fun `should report nothing when methods do not match`() {
        val code = """
        import java.lang.System
        fun main() {
            System.out.println("hello")
        }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.lang.System.gc")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).isEmpty()
    }

    @Test
    fun `should report method call when using the fully qualified name`() {
        val code = """
        fun main() {
            java.lang.System.out.println("hello")
        }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.io.PrintStream.println")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasTextLocations(38 to 54)
    }

    @Test
    fun `should report method call when not using the fully qualified name`() {
        val code = """
        import java.lang.System.out
        fun main() {
            out.println("hello")
        }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.io.PrintStream.println")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasTextLocations(49 to 65)
    }

    @Test
    fun `should report multiple different methods`() {
        val code = """
        import java.lang.System
        fun main() {
        System.out.println("hello")
            System.gc()
        }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(
                mapOf(
                    METHODS to listOf(
                        "java.io.PrintStream.println",
                        "java.lang.System.gc"
                    )
                )
            )
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(2)
        assertThat(findings).hasTextLocations(48 to 64, 76 to 80)
    }

    @Test
    fun `should report multiple different methods config with sting`() {
        val code = """
        import java.lang.System
        fun main() {
        System.out.println("hello")
            System.gc()
        }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to "java.io.PrintStream.println, java.lang.System.gc"))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(2)
        assertThat(findings).hasTextLocations(48 to 64, 76 to 80)
    }

    @Test
    fun `should report equals operator`() {
        val code = """
            fun main() {
                java.math.BigDecimal(5.5) == java.math.BigDecimal(5.5)
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.math.BigDecimal.equals")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
    }

    @Test
    fun `should report prefix operator`() {
        val code = """
            fun test() {
                var i = 1
                ++i
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("kotlin.Int.inc")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
    }

    @Test
    fun `should report postfix operator`() {
        val code = """
            fun test() {
                var i = 1
                i--
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("kotlin.Int.dec")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
    }

    @Test
    fun `should report both methods when using just method name without full signature`() {
        val code = """
            import java.time.Clock
            import java.time.LocalDate
            fun test() {
                val clock = Clock.systemUTC()
                val date = LocalDate.now()
                val date2 = LocalDate.now(clock)
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.time.LocalDate.now")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(2)
    }

    @Test
    fun `should report parameterless method when full signature matches`() {
        val code = """
            import java.time.Clock
            import java.time.LocalDate
            fun test() {
                val clock = Clock.systemUTC()
                val date = LocalDate.now()
                val date2 = LocalDate.now(clock)
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.time.LocalDate.now()")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasSourceLocation(5, 26)
    }

    @Test
    fun `should report method with param when full signature matches`() {
        val code = """
            import java.time.Clock
            import java.time.LocalDate
            fun test() {
                val clock = Clock.systemUTC()
                val date = LocalDate.now()
                val date2 = LocalDate.now(clock)
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.time.LocalDate.now(java.time.Clock)")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasSourceLocation(6, 27)
    }

    @Test
    fun `should report method with multiple params when full signature matches`() {
        val code = """
            import java.time.LocalDate
            fun test() {
                val date = LocalDate.of(2020, 1, 1)
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.time.LocalDate.of(kotlin.Int, kotlin.Int, kotlin.Int)")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasSourceLocation(3, 26)
    }

    @Test
    fun `should report method with multiple params when full signature matches with additional spacing`() {
        val code = """
            import java.time.LocalDate
            fun test() {
                val date = LocalDate.of(2020, 1, 1)
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("java.time.LocalDate.of(kotlin.Int,kotlin.Int,kotlin.Int)")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasSourceLocation(3, 26)
    }

    @Test
    fun `should report method with multiple params when method has spaces and commas`() {
        val code = """
            package io.gitlab.arturbosch.detekt.rules.style
            
            fun `some, test`() = "String"

            fun test() {
                val s = `some, test`()
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("io.gitlab.arturbosch.detekt.rules.style.`some, test`()")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasSourceLocation(6, 13)
    }

    @Test
    fun `should report method with default params`() {
        val code = """
            package io.gitlab.arturbosch.detekt.rules.style
            
            fun defaultParamsMethod(s:String, i:Int = 0) = s + i

            fun test() {
                val s = defaultParamsMethod("test")
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(
                mapOf(
                    METHODS to
                        listOf("io.gitlab.arturbosch.detekt.rules.style.defaultParamsMethod(kotlin.String,kotlin.Int)")
                )
            )
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
        assertThat(findings).hasSourceLocation(6, 13)
    }

    @Test
    fun `should report overriding method calls`() {
        val code = """
            package org.example.com
            
            interface I {
                fun f()
            }
            
            class C : I {
                override fun f() {}
            }
            
            fun foo(i: I, c: C) {
                i.f()
                c.f()
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("org.example.com.I.f")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(2)
    }

    @Test
    fun `should report functions with lambda params`() {
        val code = """
            package org.example

            fun bar(b: (String) -> String) = Unit

            fun foo() {
                bar { "" }
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("org.example.bar((kotlin.String) -> kotlin.String)")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
    }

    @Test
    fun `should report extension functions`() {
        val code = """
            package org.example

            fun String.bar() = Unit

            fun foo() {
                "".bar()
            }
        """
        val findings = ForbiddenMethodCall(
            TestConfig(mapOf(METHODS to listOf("org.example.bar(kotlin.String)")))
        ).compileAndLintWithContext(env, code)
        assertThat(findings).hasSize(1)
    }

    @Nested
    inner class `work with generics` {
        val code = """
            package org.example

            fun <T, U> bar(a: T, b: U, c: String) = Unit

            fun foo() {
                bar(1, "", "")
            }
        """

        @Test
        fun `raise the issue`() {
            val findings = ForbiddenMethodCall(
                TestConfig(mapOf(METHODS to listOf("org.example.bar(T, U, kotlin.String)")))
            ).compileAndLintWithContext(env, code)
            assertThat(findings).hasSize(1)
        }

        @Test
        fun `It doesn't raise any issue because the generics don't match`() {
            val findings = ForbiddenMethodCall(
                TestConfig(mapOf(METHODS to listOf("org.example.bar(U, T, kotlin.String)")))
            ).compileAndLintWithContext(env, code)
            assertThat(findings).isEmpty()
        }
    }

    @Nested
    inner class `work with generic extensions` {
        val code = """
            package org.example

            fun <R> R.bar(a: String) = Unit

            fun foo() {
                1.bar("")
            }
        """

        @Test
        fun `raise the issue`() {
            val findings = ForbiddenMethodCall(
                TestConfig(mapOf(METHODS to listOf("org.example.bar(R, kotlin.String)")))
            ).compileAndLintWithContext(env, code)
            assertThat(findings).hasSize(1)
        }

        @Test
        fun `It doesn't raise any issue because the type doesn't match`() {
            val findings = ForbiddenMethodCall(
                TestConfig(mapOf(METHODS to listOf("org.example.bar(kotlin.Int, kotlin.String)")))
            ).compileAndLintWithContext(env, code)
            assertThat(findings).isEmpty()
        }
    }

    @Nested
    inner class `Should distinguish between runCatching - #4448` {
        val code = """
            package org.example

            class A {
                fun foo() {
                    kotlin.runCatching {}
                    runCatching {}
                }
            }
        """

        @Test
        fun `forbid the one without receiver`() {
            val findings = ForbiddenMethodCall(
                TestConfig(mapOf(METHODS to listOf("kotlin.runCatching(() -> R)")))
            ).compileAndLintWithContext(env, code)
            assertThat(findings)
                .hasSize(1)
                .hasSourceLocation(5, 16)
        }

        @Test
        fun `forbid the one with receiver`() {
            val findings = ForbiddenMethodCall(
                TestConfig(mapOf(METHODS to listOf("kotlin.runCatching(T, (T) -> R)")))
            ).compileAndLintWithContext(env, code)
            assertThat(findings)
                .hasSize(1)
                .hasSourceLocation(6, 9)
        }
    }

    @Nested
    inner class `Java getter calls` {

        @Test
        fun `should report Java getter call`() {
            val code = """
                import java.util.Calendar
                
                fun main() {
                    val calendar = Calendar.getInstance()
                    val day = calendar.getFirstDayOfWeek()
                }
            """
            val findings =
                ForbiddenMethodCall(TestConfig(mapOf(METHODS to "java.util.Calendar.getFirstDayOfWeek"))).compileAndLintWithContext(
                    env,
                    code
                )
            assertThat(findings).hasSize(1)
        }

        @Test
        fun `should report property getters call`() {
            val code = """
                import java.util.Calendar
                
                fun main() {
                    val calendar = Calendar.getInstance()
                    val day = calendar.firstDayOfWeek
                }
            """
            val findings =
                ForbiddenMethodCall(TestConfig(mapOf(METHODS to "java.util.Calendar.getFirstDayOfWeek"))).compileAndLintWithContext(
                    env,
                    code
                )
            assertThat(findings).hasSize(1)
        }
    }

    @Test
    fun `should report property setters call`() {
        val code = """
                import java.util.Calendar
                
                fun main() {
                    val calendar = Calendar.getInstance()
                    calendar.firstDayOfWeek = 1
                }
            """
        val findings =
            ForbiddenMethodCall(TestConfig(mapOf(METHODS to "java.util.Calendar.setFirstDayOfWeek"))).compileAndLintWithContext(
                env,
                code
            )
        assertThat(findings).hasSize(1)
    }

    @Test
    fun `should report reference call`() {
        val code = """
                import java.util.Calendar
                
                fun main() {
                    val calendar = Calendar.getInstance()
                    calendar.let(calendar::getFirstDayOfWeek)
                }
            """
        val findings =
            ForbiddenMethodCall(TestConfig(mapOf(METHODS to "java.util.Calendar.getFirstDayOfWeek"))).compileAndLintWithContext(
                env,
                code
            )
        assertThat(findings).hasSize(1)
    }
}