add unit tests for libjwt.get_token function

Author: infezek

test/get_token_test.lua

@@ -0,0 +1,30 @@
+local lu = require('luaunit')
+local libjwt = require('../lib/resty/libjwt')
+
+function TestShouldReturnErrorWhenNotFindingTheToken()
+    local headers = {
+        ["header_token"] = "token 123",
+    }
+    local result, err = libjwt.get_token(headers, "header89")
+    lu.assertEquals(err, "token not found")
+    lu.assertEquals(result, nil )
+
+    local headers = {
+        ["header_token"] = "token123",
+    }
+    local result, err = libjwt.get_token(headers, "header_token")
+    lu.assertEquals(err, "token not found")
+    lu.assertEquals(result, nil )
+end
+
+function TestShouldNotReturnErrorWhenCorrectParameters()
+    local headers = {
+        ["token"] = "token 123",
+    }
+    local result, err = libjwt.get_token(headers, "token")
+    lu.assertEquals(err, "")
+    lu.assertEquals(result, "123" )
+end
+
+
+os.exit( lu.LuaUnit.run() )