diff --git a/meta-tests.txt b/meta-tests.txt
new file mode 100644
index 0000000..e94b65c
--- /dev/null
+++ b/meta-tests.txt
@@ -0,0 +1,17 @@
+base
+subshell-usage
+subshell-simple
+subshell-undeclared
+subshell-source
+subshell-clean
+subshell-clean-undeclared
+subshell-export
+subshell-export-nested
+subshell-unexport
+subshell-unexport-nested
+subshell-declare
+subshell-declare-nested
+function-list
+function-unload
+function-export
+function-unexport
diff --git a/meta-tests/base.sh b/meta-tests/base.sh
new file mode 100755
index 0000000..64b6008
--- /dev/null
+++ b/meta-tests/base.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+source ./mo
+if (( FAIL )); then
+    exit 1
+fi
diff --git a/meta-tests/function-export.sh b/meta-tests/function-export.sh
new file mode 100755
index 0000000..fb6ba3c
--- /dev/null
+++ b/meta-tests/function-export.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+list_function_names() {
+    declare -F | while read l; do echo ${l/#* /}; done | sort
+}
+declare -xf list_function_names
+
+f_orig=$(list_function_names)
+
+source ./mo
+moExport
+
+f=$(bash -c list_function_names)
+
+f_new=$(comm -13 <(echo $f_orig | tr ' ' '\n') <(echo $f | tr ' ' '\n'))
+
+diff <(echo $f_new | tr ' ' '\n') <(moListFuncs | sort)
diff --git a/meta-tests/function-list.sh b/meta-tests/function-list.sh
new file mode 100755
index 0000000..cf38e4d
--- /dev/null
+++ b/meta-tests/function-list.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+list_function_names() {
+    declare -F | while read l; do echo ${l/#* /}; done | sort
+}
+
+f_orig=$(list_function_names)
+
+source ./mo
+
+f=$(list_function_names)
+
+f_new=$(comm -13 <(echo $f_orig | tr ' ' '\n') <(echo $f | tr ' ' '\n'))
+
+diff <(echo $f_new | tr ' ' '\n') <(moListFuncs | sort)
diff --git a/meta-tests/function-unexport.sh b/meta-tests/function-unexport.sh
new file mode 100755
index 0000000..5190c49
--- /dev/null
+++ b/meta-tests/function-unexport.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+list_function_names() {
+    declare -F | while read l; do echo ${l/#* /}; done | sort
+}
+declare -xf list_function_names
+
+f_orig=$(list_function_names)
+
+source ./mo
+moExport
+moUnexport
+
+f=$(bash -c list_function_names)
+
+diff <(echo $f_orig | tr ' ' '\n') <(echo $f | tr ' ' '\n')
diff --git a/meta-tests/function-unload.sh b/meta-tests/function-unload.sh
new file mode 100755
index 0000000..263c8d7
--- /dev/null
+++ b/meta-tests/function-unload.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+list_function_names() {
+    declare -F | while read l; do echo ${l/#* /}; done | sort
+}
+
+f_orig=$(list_function_names)
+
+source ./mo
+moUnload
+
+f=$(list_function_names)
+
+diff <(echo $f_orig | tr ' ' '\n') <(echo $f | tr ' ' '\n')
diff --git a/meta-tests/subshell-clean-undeclared.sh b/meta-tests/subshell-clean-undeclared.sh
new file mode 100755
index 0000000..56ba131
--- /dev/null
+++ b/meta-tests/subshell-clean-undeclared.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+source ./mo
+moExport
+env --ignore-environment << "EOF"
+source ./run-basic-tests
+if ! (( FAIL )); then
+    exit 1
+fi
+EOF
diff --git a/meta-tests/subshell-clean.sh b/meta-tests/subshell-clean.sh
new file mode 100755
index 0000000..c8fa996
--- /dev/null
+++ b/meta-tests/subshell-clean.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+source ./mo
+cat <(moDeclare) - << "EOF" | env --ignore-environment bash
+source ./run-basic-tests
+if (( FAIL )); then
+    exit 1
+fi
+EOF
diff --git a/meta-tests/subshell-declare-nested.sh b/meta-tests/subshell-declare-nested.sh
new file mode 100755
index 0000000..5b385a9
--- /dev/null
+++ b/meta-tests/subshell-declare-nested.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+source ./mo
+cat <(moDeclare) - << "EOF" | bash
+cat <(moDeclare) - << "EOF2" | bash
+cat <(moDeclare) - << "EOF3" | bash
+cat <(moDeclare) - << "EOF4" | bash
+source ./run-basic-tests
+if (( FAIL )); then
+    exit 1
+fi
+EOF4
+EOF3
+EOF2
+EOF
diff --git a/meta-tests/subshell-declare.sh b/meta-tests/subshell-declare.sh
new file mode 100755
index 0000000..9b6db40
--- /dev/null
+++ b/meta-tests/subshell-declare.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+source ./mo
+cat <(moDeclare) - << "EOF" | bash
+source ./run-basic-tests
+if (( FAIL )); then
+    exit 1
+fi
+EOF
diff --git a/meta-tests/subshell-export-nested.sh b/meta-tests/subshell-export-nested.sh
new file mode 100755
index 0000000..e4cbd89
--- /dev/null
+++ b/meta-tests/subshell-export-nested.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+source ./mo
+moExport
+bash << "EOF"
+bash << "EOF2"
+bash << "EOF3"
+bash << "EOF4"
+source ./run-basic-tests
+if (( FAIL )); then
+exit 1
+fi
+EOF4
+EOF3
+EOF2
+EOF
diff --git a/meta-tests/subshell-export.sh b/meta-tests/subshell-export.sh
new file mode 100755
index 0000000..83147e0
--- /dev/null
+++ b/meta-tests/subshell-export.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+source ./mo
+moExport
+bash << "EOF"
+source ./run-basic-tests
+if (( FAIL )); then
+    exit 1
+fi
+EOF
+
diff --git a/meta-tests/subshell-simple.sh b/meta-tests/subshell-simple.sh
new file mode 100755
index 0000000..6e874bd
--- /dev/null
+++ b/meta-tests/subshell-simple.sh
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+source ./mo
+bash << "EOF"
+source ./run-basic-tests
+if ! (( FAIL )); then
+    exit 1
+fi
+EOF
diff --git a/meta-tests/subshell-source.sh b/meta-tests/subshell-source.sh
new file mode 100755
index 0000000..6edb3d9
--- /dev/null
+++ b/meta-tests/subshell-source.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+bash << "EOF"
+source ./mo
+source ./run-basic-tests
+if (( FAIL )); then
+    exit 1
+fi
diff --git a/meta-tests/subshell-undeclared.sh b/meta-tests/subshell-undeclared.sh
new file mode 100755
index 0000000..da66a32
--- /dev/null
+++ b/meta-tests/subshell-undeclared.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+bash << "EOF"
+source ./run-basic-tests
+if ! (( FAIL )); then
+    exit 1
+fi
+EOF
diff --git a/meta-tests/subshell-unexport-nested.sh b/meta-tests/subshell-unexport-nested.sh
new file mode 100755
index 0000000..9d0f2df
--- /dev/null
+++ b/meta-tests/subshell-unexport-nested.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+source ./mo
+moExport
+bash << "EOF"
+moUnexport
+bash << "EOF2"
+source ./run-basic-tests
+if ! (( FAIL )); then
+    exit 1
+fi
+EOF2
+EOF
diff --git a/meta-tests/subshell-unexport.sh b/meta-tests/subshell-unexport.sh
new file mode 100755
index 0000000..b0c1fe5
--- /dev/null
+++ b/meta-tests/subshell-unexport.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+source ./mo
+moExport
+moUnexport
+bash << "EOF"
+source ./run-basic-tests
+if ! (( FAIL )); then
+    exit 1
+fi
+EOF
diff --git a/meta-tests/subshell-usage.sh b/meta-tests/subshell-usage.sh
new file mode 100755
index 0000000..32fc9c1
--- /dev/null
+++ b/meta-tests/subshell-usage.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+source ./mo
+diff <(moUsage) <((moDeclare; echo moUsage) | bash)
diff --git a/mo b/mo
index c928d7c..38d18bb 100755
--- a/mo
+++ b/mo
@@ -1095,9 +1095,111 @@ moUsage() {
 }
 
 
+# Produce a list of all shell function declared by mo, and brought
+# into any shell that had sourced the file. Each name is given on one
+# line of standard output.
+moListFuncs() {
+    cat <<EOF
+mo
+moCallFunction
+moFindEndTag
+moFindString
+moFullTagName
+moGetContent
+moIndentLines
+moIndirect
+moIndirectArray
+moIsArray
+moIsFunction
+moIsStandalone
+moJoin
+moLoadFile
+moLoop
+moParse
+moPartial
+moShow
+moSplit
+moStandaloneAllowed
+moStandaloneDenied
+moTest
+moTestVarSet
+moTrimChars
+moTrimWhitespace
+moUsage
+moListFuncs
+moListVars
+moUnload
+moExport
+moUnexport
+moDeclare
+EOF
+}
+
+
+# Produce a list of all shell variables declared by mo, and brought
+# into any shell that had sourced the file. Each name is given on one
+# line of standard output.
+moListVars() {
+    cat <<EOF
+MO_ORIGINAL_COMMAND
+MO_VERSION
+MO_EXPORT
+EOF
+}
+
+
+# Clear all shell functions and variables for names used by mo,
+# restoring the shell to a state as though mo had never been sourced
+# (assuming no naming collisions).
+moUnload() {
+    unset -v $(moListVars)
+    unset -f $(moListFuncs)
+}
+
+
+# Mark for export all shell functions and variables used by mo, such
+# that any child (or descendant) Bash process may call mo as though
+# itself having sourced the file.
+moExport() {
+    export $(moListVars)
+    export -f $(moListFuncs)
+    MO_EXPORT=1
+}
+
+
+# Unmark for export all shell functions and variables used by, such
+# that any new child (or descendant) Bash process would not inherit
+# them, regardless of any past operations.
+moUnexport() {
+    export -n $(moListVars)
+    export -fn $(moListFuncs)
+    MO_EXPORT=
+}
+
+
+# Print declaration of all shell functions and variables used by mo,
+# suitable for processing by another Bash shell. Any Bash instance
+# processing the output of this function may afterward call mo as
+# though itself having sourced the file.
+moDeclare() {
+    local functions="$(moListFuncs)"
+    if ! [ -z "${functions}" ]; then
+        declare -fp ${functions}
+    fi
+    local vars="$(moListVars)"
+    if ! [ -z "${vars}" ]; then
+        declare -p ${vars}
+    fi
+    if ! [ -z "${MO_EXPORT}" ]; then
+        echo moExport
+    fi
+}
+
+
 # Save the original command's path for usage later
 MO_ORIGINAL_COMMAND="$(cd "${BASH_SOURCE[0]%/*}" || exit 1; pwd)/${BASH_SOURCE[0]##*/}"
 MO_VERSION="2.2.0"
+MO_EXPORT=
 
 # If sourced, load all functions.
 # If executed, perform the actions as expected.
diff --git a/run-basic-tests b/run-basic-tests
new file mode 100755
index 0000000..b7c4580
--- /dev/null
+++ b/run-basic-tests
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+cd "$(dirname "$0")" || exit 1
+
+for TEST in tests/*.expected; do
+    export BASE="${TEST%.expected}"
+    export MO_FALSE_IS_EMPTY=
+
+    echo -n "basic:${BASE#tests/} ... "
+
+    (
+        if [[ -f "${BASE}.sh" ]]; then
+            # Run a shell script if one exists
+            "${BASE}.sh"
+        else
+            # Fall back to using .env and .template
+            # shellcheck disable=SC1090
+            . "${BASE}.env"
+            echo "Do not read this input" | mo "${BASE}.template"
+        fi
+    ) | diff -U5 - "${TEST}" > "${BASE}.diff"
+
+    statusCode=$?
+
+    if [[ $statusCode -ne 0 ]]; then
+        echo "FAIL (status code $statusCode)"
+        FAIL=$(( FAIL + 1 ))
+    else
+        echo "ok"
+        PASS=$(( PASS + 1 ))
+        rm "${BASE}.diff"
+    fi
+done
diff --git a/run-meta-tests b/run-meta-tests
new file mode 100644
index 0000000..3af69f0
--- /dev/null
+++ b/run-meta-tests
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+cd "$(dirname "$0")" || exit 1
+
+for TEST in $(cat meta-tests.txt); do
+
+    echo -n "meta:$TEST ... "
+
+    (
+        meta-tests/${TEST}.sh > /dev/null 2> /dev/null
+    )
+
+    statusCode=$?
+
+    if [[ $statusCode -ne 0 ]]; then
+        echo "FAIL (status code $statusCode)"
+        FAIL=$(( FAIL + 1 ))
+    else
+        echo "ok"
+        PASS=$(( PASS + 1 ))
+    fi
+
+done
diff --git a/run-tests b/run-tests
index b1a0331..33889b7 100755
--- a/run-tests
+++ b/run-tests
@@ -1,44 +1,18 @@
 #!/usr/bin/env bash
 
-cd "${0%/*}" || exit 1
+cd "$(dirname "$0")" || exit 1
 
 # shellcheck disable=SC1091
 . ./mo
 PASS=0
 FAIL=0
 
-for TEST in tests/*.expected; do
-    export BASE="${TEST%.expected}"
-    export MO_FALSE_IS_EMPTY=
+source ./run-basic-tests
 
-    echo -n "$BASE ... "
-
-    (
-        if [[ -f "${BASE}.sh" ]]; then
-            # Run a shell script if one exists
-            "${BASE}.sh"
-        else
-            # Fall back to using .env and .template
-            # shellcheck disable=SC1090
-            . "${BASE}.env"
-            echo "Do not read this input" | mo "${BASE}.template"
-        fi
-    ) | diff -U5 - "${TEST}" > "${BASE}.diff"
-
-    statusCode=$?
-
-    if [[ $statusCode -ne 0 ]]; then
-        echo "FAIL (status code $statusCode)"
-        FAIL=$(( FAIL + 1 ))
-    else
-        echo "ok"
-        PASS=$(( PASS + 1 ))
-        rm "${BASE}.diff"
-    fi
-done
+source ./run-meta-tests
 
 echo ""
-echo "Pass:  $PASS"
+echo "Pass: $PASS"
 echo "Fail: $FAIL"
 if [[ $FAIL -gt 0 ]]; then
     exit 1