ts: add tests where tags are updated on loaded mods

Author: xdelaruelle

testsuite/modulefiles.3/foo/1.0

@@ -1,2 +1,10 @@
 #%Module
 module-whatis [module-info name]
+
+if {[info exists env(TESTSUITE_TAG_OPT)]} {
+    switch -- $env(TESTSUITE_TAG_OPT) {
+        prtag12 {
+            prereq --tag=keep-loaded:foo tag/8.0
+        }
+    }
+}

testsuite/modulefiles.3/tag/8.0

@@ -115,5 +115,29 @@ if {[info exists env(TESTSUITE_TAG_OPT)]} {
         loadanytag1 {
             module load-any [email protected] bar=val1 foo/1.0 --tag foo
         }
+        prtag9 {
+            depends-on --tag=foo foo/1.0
+        }
+        prtag10 {
+            prereq --tag hidden-loaded:foo foo/1.0 bar/1.0
+        }
+        switchtag1 {
+            module switch --tag=foo bar/1.0 foo/1.0
+        }
+        switchtag2 {
+            module switch --tag=foo:hidden-loaded bar/1.0 foo/1.0
+        }
+        loadtag5 {
+            module load --tag=bar:foo:keep-loaded foo/1.0 bar/1.0
+        }
+        loadtag6 {
+            module load --tag=bar:keep-loaded:auto-loaded foo/1.0
+        }
+        prtag11 {
+            prereq --tag=auto-loaded:keep-loaded:foo foo/1.0
+        }
+        prtag12 {
+            prereq --tag=keep-loaded:foo foo/1.0
+        }
     }
 }