Add a test for 'blank_lines_lower_bound = 1'

tests/source/configs-blank_lines_lower_bound-1.rs

@@ -0,0 +1,13 @@
+// rustfmt-blank_lines_lower_bound: 1
+
+fn foo() {}
+fn bar() {}
+// comment
+fn foobar() {}
+
+fn foo1() {}
+fn bar1() {}
+
+// comment
+
+fn foobar1() {}

tests/target/configs-blank_lines_lower_bound-1.rs

@@ -0,0 +1,16 @@
+// rustfmt-blank_lines_lower_bound: 1
+
+fn foo() {}
+
+fn bar() {}
+
+// comment
+fn foobar() {}
+
+fn foo1() {}
+
+fn bar1() {}
+
+// comment
+
+fn foobar1() {}