Add Task model tests

Habitica/src/test/java/com/habitrpg/android/habitica/models/TaskTest.kt

@@ -0,0 +1,63 @@
+package com.habitrpg.android.habitica.models
+
+import com.habitrpg.android.habitica.models.tasks.Task
+import io.kotest.core.spec.style.WordSpec
+import io.kotest.matchers.shouldBe
+import java.util.Date
+import java.time.ZonedDateTime
+import java.util.Calendar
+
+class TaskTest : WordSpec({
+    val task = Task()
+
+    fun date(
+            year: Int = 1989,
+            month: Int = 1,
+            day: Int = 2,
+            hourOfDay: Int = 3,
+            minute: Int = 4,
+            second: Int = 5
+    ) : Date {
+        val calendar = Calendar.getInstance()
+        calendar.set(year, month, day, hourOfDay, minute, second)
+
+        return calendar.time
+    }
+
+    "isDueToday" should {
+        "false if the day of year is before today" {
+            val now =  ZonedDateTime.now()
+            task.dueDate = date(day= now.dayOfYear - 1, year = now.year)
+
+            task.isDueToday() shouldBe false
+        }
+
+        "false if the year is before today" {
+            val now =  ZonedDateTime.now()
+            task.dueDate = date(day= now.dayOfYear, year = now.year - 1)
+
+            task.isDueToday() shouldBe false
+        }
+
+        "true if the day of year is after today" {
+            val now =  ZonedDateTime.now()
+            task.dueDate = date(day= now.dayOfYear + 1, year = now.year)
+
+            task.isDueToday() shouldBe true
+        }
+
+        "true if the year is after today" {
+            val now =  ZonedDateTime.now()
+            task.dueDate = date(day= now.dayOfYear, year = now.year + 1)
+
+            task.isDueToday() shouldBe true
+        }
+
+        "true if it is today" {
+            val now =  ZonedDateTime.now()
+            task.dueDate = date(day= now.dayOfYear, year = now.year)
+
+            task.isDueToday() shouldBe true
+        }
+    }
+})