diceware: add Die class and tests

1 files changed, 47 insertions, 0 deletions

diff --git a/passgen/diceware/src/test/kotlin/dev/msfjarvis/aps/passgen/diceware/DieTest.kt b/passgen/diceware/src/test/kotlin/dev/msfjarvis/aps/passgen/diceware/DieTest.kt
new file mode 100644
index 00000000..69a355c5
--- /dev/null
+++ b/passgen/diceware/src/test/kotlin/dev/msfjarvis/aps/passgen/diceware/DieTest.kt
@@ -0,0 +1,47 @@
+/*
+ * Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package dev.msfjarvis.aps.passgen.diceware
+
+import kotlin.random.Random
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class DieTest {
+
+  /** Pre-seeded [Random] instance to ensure tests are deterministic. */
+  private val random = Random(1_00_000)
+
+  private val intGenerator = RandomIntGenerator { it.random(random) }
+
+  @Test
+  fun test_one_roll() {
+    val die = Die(6, intGenerator)
+    assertEquals(5, die.roll())
+  }
+
+  @Test
+  fun test_multiple_rolls() {
+    val die = Die(6, intGenerator)
+    assertEquals(526242, die.rollMultiple(6))
+  }
+
+  @Test
+  fun test_consecutive_rolls() {
+    val die = Die(6, intGenerator)
+    assertEquals(5, die.roll())
+    assertEquals(2, die.roll())
+    assertEquals(6, die.roll())
+    assertEquals(2, die.roll())
+    assertEquals(4, die.roll())
+    assertEquals(2, die.roll())
+  }
+
+  @Test
+  fun test_100_sides() {
+    val die = Die(100, intGenerator)
+    assertEquals(67, die.roll())
+  }
+}