implement tests ValueCheckPointDistribution

Author: KamelMohamad

slider/src/test/java/io/monstarlab/mosaic/slider/ValueCheckPointDistributionTest.kt

@@ -0,0 +1,79 @@
+package io.monstarlab.mosaic.slider
+
+import org.junit.Assert.*
+
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+
+class ValueCheckPointDistributionTest {
+
+    private  lateinit var valueCheckPointDistribution : ValueCheckPointDistribution
+    private val accuracy = 0.0001f
+
+    @Before
+    fun setUp() {
+
+        valueCheckPointDistribution =  ValueCheckPointDistribution(
+            listOf(
+                0f to 0f,
+                25f to 25f,
+                50f to 75f,
+                100f to 100f,
+            )
+        )
+    }
+
+    @After
+    fun tearDown() {
+    }
+
+    @Test
+    fun `test create from pairs with decreasing value`() {
+        assertThrows(ValueCheckPointDistribution.DecreasingValueException::class.java) {
+            ValueCheckPointDistribution(
+                listOf(
+                    0f to 0f,
+                    5f to 10f,
+                    8f to 16f,
+                    7f to 20f,
+                )
+            )
+        }
+
+    }
+
+    @Test
+    fun `create from pairs and interpolate`() {
+
+        val points = listOf(
+            0.1f to 0.1f,
+            0.2f to 0.2f,
+            0.25f to 0.25f,
+            0.4f to 0.55f,
+            0.6f to 0.8f,
+            0.75f to 0.875f,
+        )
+        points.forEach {
+            assertEquals(it.second, valueCheckPointDistribution.interpolate(it.first), accuracy)
+        }
+
+    }
+
+    @Test
+    fun `create from pairs and inverse`() {
+
+        val points = listOf(
+            0.1f to 0.1f,
+            0.2f to 0.2f,
+            0.25f to 0.25f,
+            0.4f to 0.55f,
+            0.6f to 0.8f,
+            0.75f to 0.875f,
+        )
+        points.forEach {
+            assertEquals(it.first, valueCheckPointDistribution.inverse(it.second), accuracy)
+        }
+
+    }
+}