feat(#1367): render agent MEDIA inline at its directive position (#1370)

app/src/test/java/com/m57/hermescontrol/ui/chat/MediaSegmentsTest.kt

@@ -0,0 +1,62 @@
+package com.m57.hermescontrol.ui.chat
+
+import com.m57.hermescontrol.data.model.Attachment
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class MediaSegmentsTest {
+    private fun att(
+        name: String,
+        offset: Int?,
+    ) = Attachment(uri = "u/$name", name = name, mimeType = "image/png", contentOffset = offset)
+
+    private fun kinds(segments: List<MessageSegment>) =
+        segments.map {
+            when (it) {
+                is MessageSegment.Text -> "T:${it.text}"
+                is MessageSegment.Media -> "M:${it.attachment.name}"
+            }
+        }
+
+    @Test
+    fun extractRecordsOffsetsIntoStrippedText() {
+        val text = "First: MEDIA:/a/1.png\nthen second: MEDIA:/a/2.png\nend"
+        val stripped = HostMediaExtractor.strip(text)
+        val items = HostMediaExtractor.extract(text)
+        assertEquals(2, items.size)
+        assertTrue(items[0].offset <= items[1].offset)
+        assertTrue(items[1].offset <= stripped.length)
+    }
+
+    @Test
+    fun mediaLandsBetweenTheParagraphsItSatBetween() {
+        val text = "Chart one:\nMEDIA:/a/1.png\nChart two:\nMEDIA:/a/2.png\nDone."
+        val stripped = HostMediaExtractor.strip(text)
+        val items = HostMediaExtractor.extract(text)
+        val atts = items.map { att(it.path.substringAfterLast('/'), it.offset) }
+        val out = kinds(splitByMedia(stripped, atts))
+        assertEquals(listOf("T:Chart one:", "M:1.png", "T:Chart two:", "M:2.png", "T:Done."), out)
+    }
+
+    @Test
+    fun noOffsetAppendsAfterText() {
+        val out = kinds(splitByMedia("Hello", listOf(att("x.png", null))))
+        assertEquals(listOf("T:Hello", "M:x.png"), out)
+    }
+
+    @Test
+    fun mediaOnlyMessageHasNoBlankText() {
+        val out = kinds(splitByMedia("", listOf(att("x.png", 0))))
+        assertEquals(listOf("M:x.png"), out)
+    }
+
+    @Test
+    fun mediaDoesNotSplitAFencedCodeBlock() {
+        val content = "Look:\n```\ncode line\nmore\n```\nafter"
+        val out = kinds(splitByMedia(content, listOf(att("x.png", content.indexOf("code line")))))
+        assertEquals(2, out.count { it.startsWith("T:") })
+        assertTrue(out[0].contains("more") && out[0].endsWith("```"))
+        assertEquals("M:x.png", out[1])
+    }
+}