toTixError will now return a copy if it's called on a tixerror

src/commonMain/kotlin/org/tix/error/TixError.kt

@@ -8,6 +8,11 @@ data class TixError(
     override val cause: Throwable? = null
 ) : RuntimeException("$mood: $message", cause)
 
-fun Throwable.toTixError() = TixError(message = this.message ?: "something bad happened", cause = this.cause)
+fun Throwable.toTixError() =
+    if (this is TixError) {
+        copy()
+    } else {
+        TixError(message = this.message ?: "something bad happened", cause = this.cause)
+    }
 
 fun FlowResult<*>.toTixError() = exceptionOrNull()?.toTixError() ?: TixError()

src/commonTest/kotlin/org/tix/error/TixErrorTest.kt

@@ -0,0 +1,23 @@
+package org.tix.error
+
+import kotlin.test.Test
+import kotlin.test.expect
+
+class TixErrorTest {
+    @Test
+    fun toTixError_alreadyATixError() {
+        val tixError = TixError(message = "tix_error", mood = "😬")
+        expect(tixError) {
+            tixError.toTixError()
+        }
+    }
+
+    @Test
+    fun toTixError_otherError() {
+        val cause = RuntimeException("cause")
+        val tixError = RuntimeException("other_error", cause)
+        expect(TixError(message = "other_error", cause = cause)) {
+            tixError.toTixError()
+        }
+    }
+}