diff --git a/t/Makefile.am b/t/Makefile.am
index 8722aef..165f303 100644
--- a/t/Makefile.am
+++ b/t/Makefile.am
@@ -1,4 +1,4 @@
 TEST_LOG_DRIVER = env AM_TAP_AWK='$(AWK)' $(SHELL) \
                   $(top_srcdir)/build-aux/tap-driver.sh
-TESTS = t0001-whitespace.sh t0002-invalid.sh t0003-sections.sh t0004-comments.sh t0005-new_var.sh t0006-duplication.sh
+TESTS = t0001-whitespace.sh t0002-invalid.sh t0003-sections.sh t0004-comments.sh t0005-new_var.sh t0006-duplication.sh t0007-unwanted_file.sh
 EXTRA_DIST = $(TESTS)
diff --git a/t/t0007-unwanted_file.sh b/t/t0007-unwanted_file.sh
new file mode 100755
index 0000000..6d8321e
--- /dev/null
+++ b/t/t0007-unwanted_file.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+test_description="check unwanted file"
+
+. setup.sh
+
+DIR_TEST=$SHARNESS_TEST_DIRECTORY/t0007
+
+test_expect_success "Unwanted file" "
+    export COVERAGE_NAME=file_2_parser
+    cp ../.simplecov .
+    cfg_parser $DIR_TEST/file_2.ini
+    cfg_section_sec1
+    var1=bar
+    cfg_update sec1 var1
+    cfg_writer > file_2.out
+    test ! -e 2
+"
+
+test_done
diff --git a/t/t0007/file_2.ini b/t/t0007/file_2.ini
new file mode 100644
index 0000000..f30281c
--- /dev/null
+++ b/t/t0007/file_2.ini
@@ -0,0 +1,2 @@
+[sec1]
+var1=foo