test: Forgot to add tests for 'in'/'not in'

Author: phorward

tests/op_in.lgx

@@ -0,0 +1,39 @@
+#set:string:"Hello World"
+#set:numbers:(1,2,3, 53.2)
+#set:strings:("a","b","c")
+
+# --- Test with just str
+
+"World" in string
+#expect:True
+
+"Earth" in string
+#expect:False
+
+"Earth" not in string
+#expect:True
+
+# --- Test with list of numbers
+
+3 in numbers
+#expect:True
+
+4 in numbers
+#expect:False
+
+4 not in numbers
+#expect:True
+
+"a" in numbers
+#expect:False
+
+# --- Test with list of str
+
+"a" in strings
+#expect:True
+
+"aa" in strings
+#expect:False
+
+"x" not in strings
+#expect:True