test: add more tests for getting all resp headers (#39)

Author: spacewander

t/http_header.t

@@ -200,3 +200,58 @@ get response header x-foo bar,
 get response header content-type text/plain,
 get response header content-length 4,
 get response header connection close,
+
+
+
+=== TEST 12: response header get all, repeated header
+--- config
+location /t {
+    return 200 "body";
+    header_filter_by_lua_block {
+        local resp = require("ngx.resp")
+        ngx.header["Content-Type"] = "text/html"
+        ngx.header["X-WASM"] = "true"
+        resp.add_header("X-WASM", "false")
+
+        local wasm = require("resty.proxy-wasm")
+        local plugin = assert(wasm.load("plugin", "t/testdata/http_header/main.go.wasm"))
+        local ctx = assert(wasm.on_configure(plugin, 'resp_hdr_get_all'))
+        assert(wasm.on_http_response_headers(ctx))
+    }
+}
+--- grep_error_log eval
+qr/get response header \S+ \S+/
+--- grep_error_log_out
+get response header x-wasm true,
+get response header x-wasm false,
+get response header content-type text/html,
+get response header content-length 4,
+get response header connection close,
+
+
+
+=== TEST 13: response header get all, keepalive
+--- config
+location /up {
+    return 200;
+    header_filter_by_lua_block {
+        local wasm = require("resty.proxy-wasm")
+        local plugin = assert(wasm.load("plugin", "t/testdata/http_header/main.go.wasm"))
+        local ctx = assert(wasm.on_configure(plugin, 'resp_hdr_get_all'))
+        assert(wasm.on_http_response_headers(ctx))
+    }
+}
+location /t {
+    content_by_lua_block {
+        local http = require("resty.http")
+        local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/up"
+        local httpc = http.new()
+        assert(httpc:request_uri(uri))
+    }
+}
+--- grep_error_log eval
+qr/get response header \S+ \S+/
+--- grep_error_log_out
+get response header content-type text/plain,
+get response header content-length 0,
+get response header connection keep-alive,