feat(chat): support dynamic BiDi Arabic input and isolated mixed text in Markdown (#1047)

app/src/test/java/com/m57/hermescontrol/util/BidiUtilsTest.kt

@@ -0,0 +1,89 @@
+package com.m57.hermescontrol.util
+
+import androidx.compose.ui.unit.LayoutDirection
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class BidiUtilsTest {
+    @Test
+    fun testIsRtlText_pureArabic() {
+        assertTrue(BidiUtils.isRtlText("مرحبا بك في تطبيق هيرمس"))
+    }
+
+    @Test
+    fun testIsRtlText_pureEnglish() {
+        assertFalse(BidiUtils.isRtlText("Hello from Hermes Control"))
+    }
+
+    @Test
+    fun testIsRtlText_mixedArabicWithEnglishWords() {
+        val text = "هذا النص يحتوي على Android و Compose داخل فقرة عربية"
+        assertTrue(BidiUtils.isRtlText(text))
+    }
+
+    @Test
+    fun testIsRtlText_arabicStartingWithEnglishTerm() {
+        val text = "Android هو نظام تشغيل رائع ومميز جدا"
+        assertTrue(BidiUtils.isRtlText(text))
+    }
+
+    @Test
+    fun testIsRtlText_englishSentenceWithArabicWord() {
+        val text = "The Arabic word for welcome is مرحبا in most dialects"
+        assertFalse(BidiUtils.isRtlText(text))
+    }
+
+    @Test
+    fun testIsRtlText_neutralOnly() {
+        assertFalse(BidiUtils.isRtlText(""))
+        assertFalse(BidiUtils.isRtlText("   "))
+        assertFalse(BidiUtils.isRtlText("12345"))
+        assertFalse(BidiUtils.isRtlText("🚀✨🔥"))
+        assertFalse(BidiUtils.isRtlText("/status"))
+    }
+
+    @Test
+    fun testIsRtlText_neutralPrefixWithArabic() {
+        assertTrue(BidiUtils.isRtlText("🚀 مرحبا يا صديقي"))
+        assertTrue(BidiUtils.isRtlText("- [x] مهمة جديدة مع Compose"))
+    }
+
+    @Test
+    fun testDetectTextDirection() {
+        assertEquals(BidiUtils.BidiDirection.RTL, BidiUtils.detectTextDirection("أهلا"))
+        assertEquals(BidiUtils.BidiDirection.LTR, BidiUtils.detectTextDirection("Hello"))
+        assertEquals(BidiUtils.BidiDirection.NEUTRAL, BidiUtils.detectTextDirection("123 🚀"))
+    }
+
+    @Test
+    fun testResolveLayoutDirection() {
+        assertEquals(LayoutDirection.Rtl, BidiUtils.resolveLayoutDirection("صباح الخير"))
+        assertEquals(LayoutDirection.Ltr, BidiUtils.resolveLayoutDirection("Good morning"))
+        assertEquals(LayoutDirection.Ltr, BidiUtils.resolveLayoutDirection("123", fallback = LayoutDirection.Ltr))
+        assertEquals(LayoutDirection.Rtl, BidiUtils.resolveLayoutDirection("123", fallback = LayoutDirection.Rtl))
+    }
+
+    @Test
+    fun testWrapLtrIsolate() {
+        assertEquals("${BidiUtils.LRI}Android${BidiUtils.PDI}", BidiUtils.wrapLtrIsolate("Android"))
+        assertEquals("${BidiUtils.LRI}val x = 1${BidiUtils.PDI}", BidiUtils.wrapLtrIsolate("val x = 1"))
+        // RTL snippet should not be wrapped
+        assertEquals("مرحبا", BidiUtils.wrapLtrIsolate("مرحبا"))
+    }
+
+    @Test
+    fun testAnchorTrailingRtl() {
+        val rtlWithEmoji = "مرحبا بكم 🚀"
+        assertEquals("مرحبا بكم 🚀${BidiUtils.RLM}", BidiUtils.anchorTrailingRtl(rtlWithEmoji))
+
+        // Does not append duplicate RLM
+        val alreadyAnchored = "مرحبا بكم 🚀${BidiUtils.RLM}"
+        assertEquals(alreadyAnchored, BidiUtils.anchorTrailingRtl(alreadyAnchored))
+
+        // LTR text remains unmodified
+        val ltrWithEmoji = "Welcome to Hermes 🚀"
+        assertEquals(ltrWithEmoji, BidiUtils.anchorTrailingRtl(ltrWithEmoji))
+    }
+}