feat: implement testing utilities (launchbadge#2001)

Author: abonander

.github/workflows/sqlx.yml

@@ -170,7 +170,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        postgres: [14, 9_6]
+        postgres: [14, 10]
         runtime: [async-std, tokio, actix]
         tls: [native-tls, rustls]
     needs: check
@@ -230,7 +230,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        mysql: [8, 5_6]
+        mysql: [8, 5_7]
         runtime: [async-std, tokio, actix]
         tls: [native-tls, rustls]
     needs: check
@@ -257,6 +257,17 @@ jobs:
       - run: sleep 60
 
       - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: >
+            --no-default-features
+            --features any,mysql,macros,migrate,all-types,runtime-${{ matrix.runtime }}-${{ matrix.tls }}
+        env:
+          DATABASE_URL: mysql://root:password@localhost:3306/sqlx?ssl-mode=disabled
+
+      # MySQL 5.7 supports TLS but not TLSv1.3 as required by RusTLS.
+      - uses: actions-rs/cargo@v1
+        if: ${{ !(matrix.mysql == '5_7' && matrix.tls == 'rustls') }}
         with:
           command: test
           args: >
@@ -270,7 +281,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        mariadb: [10_6, 10_2]
+        mariadb: [10_6, 10_3]
         runtime: [async-std, tokio, actix]
         tls: [native-tls, rustls]
     needs: check