#85: Added test unit for testing ,math.calcNewBotSpeed()

Author: flemming-n-larsen

server/build.gradle.kts

@@ -34,6 +34,7 @@ dependencies {
     implementation(libs.gson)
 
     testImplementation(libs.kotest.junit5)
+    testImplementation(libs.kotest.datatest)
     testImplementation(libs.mockk)
 }
 

server/src/test/kotlin/rules/mathTest.kt

@@ -0,0 +1,58 @@
+package rules
+
+import dev.robocode.tankroyale.server.rules.calcNewBotSpeed
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.datatest.withData
+import io.kotest.matchers.shouldBe
+
+
+class mathTest : FunSpec({
+
+    context("calcNewBotSpeed") {
+        withData(
+            mapOf(
+                // When starting speed is 0 with various positive target speeds, the new speed should not exceed the
+                // positive acceleration of 1
+                "current speed = 0, target speed = 0 => new speed = 0" to arrayOf(0.0, 0.0, 0.0),
+                "current speed = 0, target speed = 0.5 => new speed = 0.5" to arrayOf(0.0, 0.5, 0.5),
+                "current speed = 0, target speed = 1 => new speed = 1" to arrayOf(0.0, 1.0, 1.0),
+                // New speed cannot pass the acceleration of 1
+                "current speed = 0, target speed = 2 => new speed = 1" to arrayOf(0.0, 2.0, 1.0),
+                "current speed = 0, target speed = 8 => new speed = 1" to arrayOf(0.0, 8.0, 1.0),
+                "current speed = 0, target speed = 9 => new speed = 1" to arrayOf(0.0, 9.0, 1.0),
+
+                // When starting speed is 0 with various negative target speeds, the new speed should not exceed the
+                // negative acceleration of 1
+                "current speed = 0, target speed = -0.5 => new speed = -0.5" to arrayOf(0.0, -0.5, -0.5),
+                "current speed = 0, target speed = -1 => new speed = -1" to arrayOf(0.0, -1.0, -1.0),
+                "current speed = 0, target speed = -2 => new speed = -1" to arrayOf(0.0, -2.0, -1.0),
+                // New speed cannot pass the acceleration of -1
+                "current speed = 0, target speed = -8 => new speed = -1" to arrayOf(0.0, -8.0, -1.0),
+                "current speed = 0, target speed = -9 => new speed = -1" to arrayOf(0.0, -9.0, -1.0),
+
+                // Decelerating from max speed should allow deceleration of down to -2
+                "current speed = 8, target speed = 7 => new speed = 7" to arrayOf(8.0, 7.0, 7.0),
+                "current speed = 8, target speed = 6 => new speed = 6" to arrayOf(8.0, 6.0, 6.0),
+                // new speed cannot pass the deceleration of -2
+                "current speed = 8, target speed = 5 => new speed = 6" to arrayOf(8.0, 5.0, 6.0),
+
+                // Decelerating from min speed should allow deceleration of up to 2
+                "current speed = -8, target speed = -7 => new speed = -7" to arrayOf(-8.0, -7.0, -7.0),
+                "current speed = -8, target speed = -6 => new speed = -6" to arrayOf(-8.0, -6.0, -6.0),
+                // new speed cannot pass the deceleration of -2
+                "current speed = -8, target speed = -5 => new speed = -6" to arrayOf(-8.0, -5.0, -6.0),
+
+                // Speed crossing a positive to negative speed (original Robocode)
+                "current speed = 1, target speed = -8 => new speed = -0.5" to arrayOf(1.0, -8.0, -0.5),
+                "current speed = 0.5, target speed = -8 => new speed = -0.75" to arrayOf(0.5, -8.0, -0.75),
+
+                // Speed crossing a negative to positive speed (original Robocode)
+                "current speed = -1, target speed = 8 => new speed = 0.5" to arrayOf(-1.0, 8.0, 0.5),
+                "current speed = -0.5, target speed = 8 => new speed = 0.75" to arrayOf(-0.5, 8.0, 0.75),
+            )
+        )
+        { (currentSpeed, targetSpeed, newSpeed) ->
+            calcNewBotSpeed(currentSpeed, targetSpeed) shouldBe newSpeed
+        }
+    }
+})

settings.gradle.kts

@@ -27,6 +27,7 @@ val tankroyaleVersion: String = providers.gradleProperty("version").get()
 
 val kotlinVersion = "1.9.21"
 val junitVersion = "5.10.2"
+val kotestVersion = "5.8.1"
 
 // Check dependencies with this command:  gradle dependencyUpdates
 
@@ -55,7 +56,8 @@ dependencyResolutionManagement {
             library("system-stubs", "uk.org.webcompere:system-stubs-jupiter:2.1.6")
 
             // Kotlin testing
-            library("kotest-junit5", "io.kotest:kotest-runner-junit5-jvm:5.8.1")
+            library("kotest-junit5", "io.kotest:kotest-runner-junit5-jvm:$kotestVersion")
+            library("kotest-datatest", "io.kotest:kotest-framework-datatest:$kotestVersion")
             library("mockk", "io.mockk:mockk:1.13.10")
 
             // plugins