test: added initial DistanceProxyTest

fxgl-entity/src/test/kotlin/com/almasb/fxgl/physics/box2d/collision/DistanceProxyTest.kt

@@ -0,0 +1,59 @@
+/*
+ * FXGL - JavaFX Game Library. The MIT License (MIT).
+ * Copyright (c) AlmasB (almaslvl@gmail.com).
+ * See LICENSE for details.
+ */
+
+package com.almasb.fxgl.physics.box2d.collision
+
+import com.almasb.fxgl.core.math.Vec2
+import com.almasb.fxgl.physics.box2d.collision.shapes.CircleShape
+import com.almasb.fxgl.physics.box2d.collision.shapes.PolygonShape
+import org.hamcrest.MatcherAssert.*
+import org.hamcrest.Matchers.*
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+/**
+ *
+ * @author Almas Baimagambetov (almaslvl@gmail.com)
+ */
+class DistanceProxyTest {
+
+    private lateinit var proxy: DistanceProxy
+
+    @BeforeEach
+    fun `setUp`() {
+        proxy = DistanceProxy()
+    }
+
+    @Test
+    fun `distance proxy polygon shape`() {
+        val shape = PolygonShape()
+        shape.setAsBox(0.5f, 0.5f)
+
+        proxy.set(shape, 0)
+
+        assertThat(proxy.getVertex(0), `is`(Vec2(-0.5f, -0.5f)))
+        assertThat(proxy.radius, `is`(0.01f))
+
+        val support = proxy.getSupport(Vec2(1.0, 0.0))
+
+        assertThat(support, `is`(1))
+    }
+
+    @Test
+    fun `distance proxy circle shape`() {
+        val shape = CircleShape(2.5f)
+        shape.center.set(-2.5f, 3.2f)
+
+        proxy.set(shape, 0)
+
+        assertThat(proxy.getVertex(0), `is`(Vec2(-2.5f, 3.2f)))
+        assertThat(proxy.radius, `is`(2.5f))
+
+        val support = proxy.getSupport(Vec2(1.0, 0.0))
+
+        assertThat(support, `is`(0))
+    }
+}