Adding basic unit tests

Author: Oleg Michailov

library/build.gradle

@@ -15,6 +15,7 @@ apply plugin: 'maven-publish'
 
 dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    testCompile 'junit:junit:4.13'
 }
 repositories {
     mavenCentral()

library/src/test/kotlin/com/cesarferreira/pluralize/PluralizationTest.kt

@@ -0,0 +1,23 @@
+package com.cesarferreira.pluralize
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class PluralizationTest {
+
+    @Test
+    fun `Should add default "s" suffix`() {
+        assertEquals("posts", "post".pluralize())
+    }
+
+    @Test
+    fun `Should handle unCountable words`() {
+        assertEquals("aircraft", "aircraft".pluralize())
+    }
+
+    @Test
+    fun `Should handle exception words`() {
+        assertEquals("men", "man".pluralize())
+    }
+
+}

library/src/test/kotlin/com/cesarferreira/pluralize/SingularizationTest.kt

@@ -0,0 +1,23 @@
+package com.cesarferreira.pluralize
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class SingularizationTest {
+
+    @Test
+    fun `Should remove default "s" suffix`() {
+        assertEquals("word", "words".singularize())
+    }
+
+    @Test
+    fun `Should handle unCountable words`() {
+        assertEquals("scissors", "scissors".singularize())
+    }
+
+    @Test
+    fun `Should handle exception words`() {
+        assertEquals("person", "people".singularize())
+    }
+
+}