feat: format and highlight raw JSON in tool cards (#1189) (#1191)

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

@@ -0,0 +1,29 @@
+package com.m57.hermescontrol.ui.chat.components
+
+import com.m57.hermescontrol.theme.CodeKeyword
+import com.m57.hermescontrol.theme.CodeNumber
+import com.m57.hermescontrol.theme.CodePunctuation
+import com.m57.hermescontrol.theme.CodeString
+import org.junit.Assert.assertNotNull
+import org.junit.Test
+
+class SyntaxHighlightingTest {
+    @Test
+    fun `highlightSyntax highlights json keys as keyword and values as string`() {
+        val json = """{"status": "running", "code": 0}"""
+        val result = highlightSyntax(json)
+
+        val styles = result.spanStyles
+        val keySpan = styles.find { it.item.color == CodeKeyword }
+        assertNotNull("JSON key should be highlighted with CodeKeyword", keySpan)
+
+        val stringSpan = styles.find { it.item.color == CodeString }
+        assertNotNull("String value should be highlighted with CodeString", stringSpan)
+
+        val numberSpan = styles.find { it.item.color == CodeNumber }
+        assertNotNull("Number value should be highlighted with CodeNumber", numberSpan)
+
+        val punctSpan = styles.find { it.item.color == CodePunctuation }
+        assertNotNull("Colon/braces should be highlighted with CodePunctuation", punctSpan)
+    }
+}

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

@@ -0,0 +1,41 @@
+package com.m57.hermescontrol.ui.chat.tool
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class ToolJsonTest {
+    @Test
+    fun `prettyPrintJson formats minified json object line-by-line with indentation`() {
+        val raw = """{"name":"test","count":42,"active":true}"""
+        val formatted = ToolJson.prettyPrintJson(raw)
+
+        assertTrue(formatted.contains("\n"))
+        assertTrue(formatted.contains("  \"name\": \"test\""))
+        assertTrue(formatted.contains("  \"count\": 42"))
+        assertTrue(formatted.contains("  \"active\": true"))
+    }
+
+    @Test
+    fun `prettyPrintJson formats json array with indentation`() {
+        val raw = """[{"id":1},{"id":2}]"""
+        val formatted = ToolJson.prettyPrintJson(raw)
+
+        assertTrue(formatted.contains("\n"))
+        assertTrue(formatted.contains("  {\n    \"id\": 1\n  }"))
+    }
+
+    @Test
+    fun `prettyPrintJson returns non-json content unchanged`() {
+        val raw = "Execution failed with exit code 1"
+        val formatted = ToolJson.prettyPrintJson(raw)
+
+        assertEquals(raw, formatted)
+    }
+
+    @Test
+    fun `prettyPrintJson returns empty and blank strings unchanged`() {
+        assertEquals("", ToolJson.prettyPrintJson(""))
+        assertEquals("   ", ToolJson.prettyPrintJson("   "))
+    }
+}