Updates conformance tests and enables easier conformance debugging (#1470)

Author: johnedquinn

test/partiql-tests

@@ -64,7 +64,12 @@ class EvalExecutor(
         if (actual is PartiQLResult.Value && expect is PartiQLResult.Value) {
             return valueComparison(actual.value, expect.value)
         }
-        error("Cannot compare different types of PartiQLResult")
+        val errorMessage = buildString {
+            appendLine("Cannot compare different types of PartiQLResult.")
+            appendLine(" - Expected : $expect")
+            appendLine(" - Actual   : $actual")
+        }
+        error(errorMessage)
     }
 
     // Value comparison of PartiQL Value that utilized Ion Hashcode.

test/partiql-tests-runner/src/test/kotlin/org/partiql/runner/executor/EvalExecutor.kt

@@ -46,7 +46,7 @@ class TestRunner<T, V>(private val factory: TestExecutor.Factory<T, V>) {
             }
         } catch (e: Exception) {
             when (case.assertion) {
-                is Assertion.EvaluationSuccess -> error("Expected success but exception thrown: $e")
+                is Assertion.EvaluationSuccess -> throw IllegalStateException("Expected success but exception thrown.", e)
                 is Assertion.EvaluationFailure -> {} // skip
             }
         }