Tests : create lambda recorder

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/lambda/Assertions.kt

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.tests.testutils.lambda
+
+fun assert(lambdaRecorder: LambdaRecorder): LambdaRecorderAssertions {
+    return lambdaRecorder.assertions()
+}
+
+class LambdaRecorderAssertions internal constructor(
+    private val parametersSequence: List<List<Any?>>,
+) {
+    fun isCalledOnce(): CalledOnceParametersAssertions {
+        return CalledOnceParametersAssertions(
+            assertions = isCalledExactly(1)
+        )
+    }
+
+    fun isNeverCalled() {
+        isCalledExactly(0)
+    }
+
+    fun isCalledExactly(times: Int): ParametersAssertions {
+        if (parametersSequence.size != times) {
+            throw AssertionError("Expected to be called $times, but was called ${parametersSequence.size} times")
+        }
+        return ParametersAssertions(parametersSequence)
+    }
+}
+
+class CalledOnceParametersAssertions internal constructor(private val assertions: ParametersAssertions) {
+    fun with(vararg matchers: ParameterMatcher) {
+        assertions.withSequence(matchers.toList())
+    }
+
+    fun withNoParameter() {
+        assertions.withNoParameter()
+    }
+}
+
+class ParametersAssertions internal constructor(
+    private val parametersSequence: List<List<Any?>>
+) {
+    fun withSequence(vararg matchersSequence: List<ParameterMatcher>) {
+        if (parametersSequence.size != matchersSequence.size) {
+            throw AssertionError("Expected ${matchersSequence.size} parameters, but got ${parametersSequence.size} parameters")
+        }
+        parametersSequence.zip(matchersSequence).forEach { (parameters, matchers) ->
+            if (parameters.size != matchers.size) {
+                throw AssertionError("Expected ${matchers.size} parameters, but got ${parameters.size} parameters")
+            }
+            parameters.zip(matchers).forEachIndexed { j, (param, matcher) ->
+                if (!matcher.match(param)) {
+                    throw AssertionError("Parameter $j does not match the expected value")
+                }
+            }
+        }
+        for (i in parametersSequence.indices) {
+            val params = parametersSequence[i]
+            val checker = matchersSequence[i]
+            if (params.size != checker.size) {
+                throw AssertionError("Expected ${checker.size} parameters, but got ${params.size} parameters")
+            }
+            for (j in params.indices) {
+                val param = params[j]
+                val check = checker[j]
+                if (!check.match(param)) {
+                    throw AssertionError("Parameter $j does not match the expected value")
+                }
+            }
+        }
+    }
+
+    fun withNoParameter() {
+        if (parametersSequence.any { it.isNotEmpty() }) {
+            throw AssertionError("Expected no parameters, but got some")
+        }
+    }
+}

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/lambda/LambdaRecorder.kt

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+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.tests.testutils.lambda
+
+/**
+ * A recorder that can be used to record the parameters of lambda invocation.
+ */
+abstract class LambdaRecorder internal constructor() {
+    private val parametersSequence: MutableList<List<Any?>> = mutableListOf()
+
+    internal fun onInvoke(vararg params: Any?) {
+        parametersSequence.add(params.toList())
+    }
+
+    fun assertions(): LambdaRecorderAssertions {
+        return LambdaRecorderAssertions(parametersSequence = parametersSequence)
+    }
+}
+
+inline fun <reified R> lambdaRecorder(
+    noinline block: () -> R
+): LambdaNoParamRecorder<R> {
+    return LambdaNoParamRecorder(block)
+}
+
+inline fun <reified T, reified R> lambdaRecorder(
+    noinline block: (T) -> R
+): LambdaOneParamRecorder<T, R> {
+    return LambdaOneParamRecorder(block)
+}
+
+inline fun <reified T1, reified T2, reified R> lambdaRecorder(
+    noinline block: (T1, T2) -> R
+): LambdaTwoParamsRecorder<T1, T2, R> {
+    return LambdaTwoParamsRecorder(block)
+}
+
+inline fun <reified T1, reified T2, reified T3, reified R> lambdaRecorder(
+    noinline block: (T1, T2, T3) -> R
+): LambdaThreeParamsRecorder<T1, T2, T3, R> {
+    return LambdaThreeParamsRecorder(block)
+}
+
+inline fun <reified T1, reified T2, reified T3, reified T4, reified R> lambdaRecorder(
+    noinline block: (T1, T2, T3, T4) -> R
+): LambdaFourParamsRecorder<T1, T2, T3, T4, R> {
+    return LambdaFourParamsRecorder(block)
+}
+
+class LambdaNoParamRecorder<out R>(val block: () -> R) : LambdaRecorder(), () -> R {
+    override fun invoke(): R {
+        onInvoke()
+        return block()
+    }
+}
+
+class LambdaOneParamRecorder<in T, out R>(val block: (T) -> R) : LambdaRecorder(), (T) -> R {
+    override fun invoke(p: T): R {
+        onInvoke(p)
+        return block(p)
+    }
+}
+
+class LambdaTwoParamsRecorder<in T1, in T2, out R>(val block: (T1, T2) -> R) : LambdaRecorder(), (T1, T2) -> R {
+    override fun invoke(p1: T1, p2: T2): R {
+        onInvoke(p1, p2)
+        return block(p1, p2)
+    }
+}
+
+class LambdaThreeParamsRecorder<in T1, in T2, in T3, out R>(val block: (T1, T2, T3) -> R) : LambdaRecorder(), (T1, T2, T3) -> R {
+    override fun invoke(p1: T1, p2: T2, p3: T3): R {
+        onInvoke(p1, p2, p3)
+        return block(p1, p2, p3)
+    }
+}
+
+class LambdaFourParamsRecorder<in T1, in T2, in T3, in T4, out R>(val block: (T1, T2, T3, T4) -> R) : LambdaRecorder(), (T1, T2, T3, T4) -> R {
+    override fun invoke(p1: T1, p2: T2, p3: T3, p4: T4): R {
+        onInvoke(p1, p2, p3, p4)
+        return block(p1, p2, p3, p4)
+    }
+}

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/lambda/ParameterMatcher.kt

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+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.tests.testutils.lambda
+
+/**
+ * A matcher that can be used to match parameters in lambda calls.
+ * This is useful to assert that a lambda has been called with specific parameters.
+ */
+interface ParameterMatcher {
+    fun match(param: Any?): Boolean
+}
+
+/**
+ * A matcher that matches a specific value.
+ * Can be used to assert that a lambda has been called with a specific value.
+ */
+fun <T> value(expectedValue: T) = object : ParameterMatcher {
+    override fun match(param: Any?) = param == expectedValue
+}
+
+/**
+ * A matcher that matches any value.
+ * Can be used when we don't care about the value of a parameter.
+ */
+fun any() = object : ParameterMatcher {
+    override fun match(param: Any?) = true
+}