Testing of static front-end resource customization

One important missing test is that the content of the customized
resource is read from storage every time rather than once. Testing
that requirement would involve creating temporary files which is a
little more work.

test/data/customized_resources.txt

@@ -0,0 +1,5 @@
+/non-existent-item      text/plain          ./test/helloworld.txt
+/                       text/html           ./test/welcome.html
+/skin/index.css         application/json    ./test/helloworld.txt
+/zimfile/A/Ray_Charles  ray/charles         ./test/welcome.html
+/search                 text/html           ./test/helloworld.txt

test/data/helloworld.txt

@@ -0,0 +1 @@
+Hello world!

test/data/welcome.html

@@ -0,0 +1 @@
+<html><head></head><body>Welcome</body></html>

test/meson.build

@@ -36,7 +36,10 @@ if gtest_dep.found() and not meson.is_cross_build()
       'zimfile&other.zim',
       'corner_cases.zim',
       'poor.zim',
-      'library.xml'
+      'library.xml',
+      'customized_resources.txt',
+      'helloworld.txt',
+      'welcome.html',
     ]
     foreach file : data_files
         # configure_file(input : 'data/' + file,

test/server.cpp

@@ -287,6 +287,68 @@ TEST_F(ServerTest, 404)
   }
 }
 
+struct CustomizedServerTest : ServerTest
+{
+  void SetUp()
+  {
+    setenv("KIWIX_SERVE_CUSTOMIZED_RESOURCES", "./test/customized_resources.txt", 1);
+    ServerTest::SetUp();
+  }
+};
+
+typedef std::vector<std::string> StringCollection;
+
+std::string getHeaderValue(const Headers& headers, const std::string& name)
+{
+  const auto er = headers.equal_range(name);
+  const auto n = std::distance(er.first, er.second);
+  if (n == 0)
+    throw std::runtime_error("Missing header: " + name);
+  if (n > 1)
+    throw std::runtime_error("Multiple occurrences of header: " + name);
+  return er.first->second;
+}
+
+TEST_F(CustomizedServerTest, NewResourcesCanBeAdded)
+{
+  // ServerTest.404 verifies that "/ROOT/non-existent-item" doesn't exist
+  const auto r = zfs1_->GET("/ROOT/non-existent-item");
+  EXPECT_EQ(r->status, 200);
+  EXPECT_EQ(getHeaderValue(r->headers, "Content-Type"), "text/plain");
+  EXPECT_EQ(r->body, "Hello world!\n");
+}
+
+TEST_F(CustomizedServerTest, ContentOfAnyServableUrlCanBeOverriden)
+{
+  {
+    const auto r = zfs1_->GET("/ROOT/");
+    EXPECT_EQ(r->status, 200);
+    EXPECT_EQ(getHeaderValue(r->headers, "Content-Type"), "text/html");
+    EXPECT_EQ(r->body, "<html><head></head><body>Welcome</body></html>\n");
+  }
+
+  {
+    const auto r = zfs1_->GET("/ROOT/skin/index.css");
+    EXPECT_EQ(r->status, 200);
+    EXPECT_EQ(getHeaderValue(r->headers, "Content-Type"), "application/json");
+    EXPECT_EQ(r->body, "Hello world!\n");
+  }
+
+  {
+    const auto r = zfs1_->GET("/ROOT/zimfile/A/Ray_Charles");
+    EXPECT_EQ(r->status, 200);
+    EXPECT_EQ(getHeaderValue(r->headers, "Content-Type"), "ray/charles");
+    EXPECT_EQ(r->body, "<html><head></head><body>Welcome</body></html>\n");
+  }
+
+  {
+    const auto r = zfs1_->GET("/ROOT/search?pattern=la+femme");
+    EXPECT_EQ(r->status, 200);
+    EXPECT_EQ(getHeaderValue(r->headers, "Content-Type"), "text/html");
+    EXPECT_EQ(r->body, "Hello world!\n");
+  }
+}
+
 namespace TestingOfHtmlResponses
 {