1 files changed, 86 insertions, 0 deletions
diff --git a/tests/lang-test-infra.sh b/tests/lang-test-infra.sh
new file mode 100644
index 000000000..30da8977b
--- /dev/null
+++ b/tests/lang-test-infra.sh
@@ -0,0 +1,86 @@
+# Test the function for lang.sh
+source common.sh
+
+source lang/framework.sh
+
+# We are testing this, so don't want outside world to affect us.
+unset _NIX_TEST_ACCEPT
+
+# We'll only modify this in subshells so we don't need to reset it.
+badDiff=0
+
+# matches non-empty
+echo Hi! > "$TEST_ROOT/got"
+cp "$TEST_ROOT/got" "$TEST_ROOT/expected"
+(
+  diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/expected"
+  (( "$badDiff" == 0 ))
+)
+
+# matches empty, non-existant file is the same as empty file
+echo -n > "$TEST_ROOT/got"
+(
+  diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/does-not-exist"
+  (( "$badDiff" == 0 ))
+)
+
+# doesn't matches non-empty, non-existant file is the same as empty file
+echo Hi! > "$TEST_ROOT/got"
+(
+  diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/does-not-exist"
+  (( "$badDiff" == 1 ))
+)
+
+# doesn't match, `badDiff` set, file unchanged
+echo Hi! > "$TEST_ROOT/got"
+echo Bye! > "$TEST_ROOT/expected"
+(
+  diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/expected"
+  (( "$badDiff" == 1 ))
+)
+[[ "$(echo Bye! )" == $(< "$TEST_ROOT/expected") ]]
+
+# _NIX_TEST_ACCEPT=1 matches non-empty
+echo Hi! > "$TEST_ROOT/got"
+cp "$TEST_ROOT/got" "$TEST_ROOT/expected"
+(
+  _NIX_TEST_ACCEPT=1 diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/expected"
+  (( "$badDiff" == 0 ))
+)
+
+# _NIX_TEST_ACCEPT doesn't match, `badDiff=1` set, file changed (was previously non-empty)
+echo Hi! > "$TEST_ROOT/got"
+echo Bye! > "$TEST_ROOT/expected"
+(
+  _NIX_TEST_ACCEPT=1 diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/expected"
+  (( "$badDiff" == 1 ))
+)
+[[ "$(echo Hi! )" == $(< "$TEST_ROOT/expected") ]]
+# second time succeeds
+(
+  diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/expected"
+  (( "$badDiff" == 0 ))
+)
+
+# _NIX_TEST_ACCEPT matches empty, non-existant file not created
+echo -n > "$TEST_ROOT/got"
+(
+  _NIX_TEST_ACCEPT=1 diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/does-not-exists"
+  (( "$badDiff" == 0 ))
+)
+[[ ! -f "$TEST_ROOT/does-not-exist" ]]
+
+# _NIX_TEST_ACCEPT doesn't match, output empty, file deleted
+echo -n > "$TEST_ROOT/got"
+echo Bye! > "$TEST_ROOT/expected"
+badDiff=0
+(
+  _NIX_TEST_ACCEPT=1 diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/expected"
+  (( "$badDiff" == 1 ))
+)
+[[ ! -f "$TEST_ROOT/expected" ]]
+# second time succeeds
+(
+  diffAndAcceptInner test "$TEST_ROOT/got" "$TEST_ROOT/expected"
+  (( "$badDiff" == 0 ))
+)