Tests: Prevent shadowing of the Python 3.7 version warning test (#1074)

Previously the test for Python 3.8 version warnings was named the same
as an earlier test for Python 3.7, meaning the earlier test definition
was overwritten and so never run.

The later test has now been renamed to the correct version, and the
test ordering adjusted for consistency with the rest of the file.

Closes @W-8110123@.

[skip changelog]

Author: edmorley

test/run-versions

@@ -140,27 +140,27 @@ testPython3_7_fail() {
   assertCapturedError
 }
 
-testPython3_7_warn() {
-  compile "python3_8_warn"
+testPython3_8() {
+  updateVersion "python3_8" $LATEST_38
+  compile "python3_8"
   if [[ $STACK = "cedar-14" ]]; then
     assertCapturedError
   else
-    assertCaptured "python-3.8.0"
-    assertCaptured "security update!"
+    assertNotCaptured "security update"
+    assertCaptured $LATEST_38
+    assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
     assertCaptured "Installing SQLite3"
     assertCapturedSuccess
   fi
 }
 
-testPython3_8() {
-  updateVersion "python3_8" $LATEST_38
-  compile "python3_8"
+testPython3_8_warn() {
+  compile "python3_8_warn"
   if [[ $STACK = "cedar-14" ]]; then
     assertCapturedError
   else
-    assertNotCaptured "security update"
-    assertCaptured $LATEST_38
-    assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
+    assertCaptured "python-3.8.0"
+    assertCaptured "security update!"
     assertCaptured "Installing SQLite3"
     assertCapturedSuccess
   fi