add tests for new runtimes

test/run

@@ -93,9 +93,21 @@ testPython2() {
     assertCapturedSuccess
 }
 
-testPython3() {
-  compile "python3"
-  assertCaptured "python-3.6.6"
+testPython3_5() {
+  compile "python3_5"
+  assertCaptured "python-3.5.6"
+  assertCapturedSuccess
+}
+
+testPython3_6() {
+  compile "python3_6"
+  assertCaptured "python-3.6.7"
+  assertCapturedSuccess
+}
+
+testPython3_7() {
+  compile "python3_7"
+  assertCaptured "python-3.7.1"
   assertCapturedSuccess
 }