Add TUs for RainbowGenerator (not all passing)

vector/src/test/java/im/vector/riotx/features/home/room/detail/composer/rainbow/RainbowGeneratorTest.kt

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.features.home.room.detail.composer.rainbow
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class RainbowGeneratorTest {
+
+    private val rainbowGenerator = RainbowGenerator()
+
+    @Test
+    fun testEmpty() {
+        assertEquals("", rainbowGenerator.generate(""))
+    }
+
+    @Test
+    fun testAscii1() {
+        assertEquals("""<font color="#ff0000">a</font>""", rainbowGenerator.generate("a"))
+    }
+
+    @Test
+    fun testAscii2() {
+        val expected =
+                """
+            <font color="#ff0000">T</font>
+            <font color="#ff5500">h</font>
+            <font color="#ffaa00">i</font>
+            <font color="#ffff00">s</font>
+             
+            <font color="#55ff00">i</font>
+            <font color="#00ff00">s</font>
+             
+            <font color="#00ffaa">a</font>
+             
+            <font color="#00aaff">r</font>
+            <font color="#0055ff">a</font>
+            <font color="#0000ff">i</font>
+            <font color="#5500ff">n</font>
+            <font color="#aa00ff">b</font>
+            <font color="#ff00ff">o</font>
+            <font color="#ff00aa">w</font>
+            <font color="#ff0055">!</font>
+        """
+                        .trimIndent()
+                        .replace("\n", "")
+
+        assertEquals(expected, rainbowGenerator.generate("This is a rainbow!"))
+    }
+
+    @Test
+    fun testEmoji1() {
+        assertEquals("""<font color="#ff0000">\uD83E\uDD1E</font>""", rainbowGenerator.generate("\uD83E\uDD1E")) // 🤞
+    }
+
+    @Test
+    fun testEmoji2() {
+        assertEquals("""<font color="#ff0000">🤞</font>""", rainbowGenerator.generate("🤞"))
+    }
+
+    @Test
+    fun testEmojiMix() {
+        val expected = """
+            <font color="#ff0000">T</font>
+            <font color="#ff5500">h</font>
+            <font color="#ffaa00">i</font>
+            <font color="#ffff00">s</font>
+             
+            <font color="#55ff00">i</font>
+            <font color="#00ff00">s</font>
+             
+            <font color="#00ffaa">a</font>
+             
+            <font color="#00aaff">r</font>
+            <font color="#0055ff">a</font>
+            <font color="#0000ff">i</font>
+            <font color="#5500ff">n</font>
+            <font color="#aa00ff">b</font>
+            <font color="#ff00ff">o</font>
+            <font color="#ff00aa">w</font>
+            <font color="#ff0055">!</font>
+        """
+                .trimIndent()
+                .replace("\n", "")
+
+        assertEquals(expected, rainbowGenerator.generate("Hello 🤞 world!"))
+    }
+}