Add/move tests for helpers.

tests/test_helpers.cpp

@@ -0,0 +1,64 @@
+#include "fs-compat.hpp"
+#include "helpers.hpp"
+
+#include <catch.hpp>
+
+#include <array>
+#include <exception>
+#include <string>
+
+SCENARIO("Helpers work as intended")
+{
+    bool exception{false};
+    bool result{false};
+
+    SECTION("is_whitespace() does what it should do")
+    {
+        for (const auto c : std::array{' ', '\n', '\r', '\t'})
+        {
+            WHEN(std::string("char is ") + c)
+            {
+                try
+                {
+                    result = epubgrep::helpers::is_whitespace(c);
+                }
+                catch (const std::exception &)
+                {
+                    exception = true;
+                }
+
+                THEN("No exception is thrown")
+                AND_THEN("Whitespace is detected")
+                {
+                    REQUIRE_FALSE(exception);
+                    REQUIRE(result);
+                }
+            }
+        }
+    }
+
+    SECTION("urldecode() doesn't fail and returns the decoded string")
+    {
+        GIVEN("The string test%20folder/%2Afile%5Btest%5D%2A")
+        {
+            std::string encoded_text{"test%20folder/%2Afile%5Btest%5D%2A"};
+            std::string decoded_text{};
+
+            try
+            {
+                decoded_text = epubgrep::helpers::urldecode(encoded_text);
+            }
+            catch (const std::exception &)
+            {
+                exception = true;
+            }
+
+            THEN("No exception is thrown")
+            AND_THEN("It returns the decoded text")
+            {
+                REQUIRE_FALSE(exception);
+                REQUIRE(decoded_text == "test folder/*file[test]*");
+            }
+        }
+    }
+}

tests/test_zip.cpp

@@ -70,33 +70,3 @@ SCENARIO("Zip file handling works")
         }
     }
 }
-
-SCENARIO("Helper functions in epubgrep::zip work")
-{
-    SECTION("urldecode() doesn't fail and returns the decoded string")
-    {
-        bool exception{false};
-
-        GIVEN("The string test%20folder/%2Afile%5Btest%5D%2A")
-        {
-            std::string encoded_text{"test%20folder/%2Afile%5Btest%5D%2A"};
-            std::string decoded_text{};
-
-            try
-            {
-                decoded_text = epubgrep::zip::urldecode(encoded_text);
-            }
-            catch (const std::exception &)
-            {
-                exception = true;
-            }
-
-            THEN("No exception is thrown")
-            AND_THEN("It returns the TOC correctly")
-            {
-                REQUIRE_FALSE(exception);
-                REQUIRE(decoded_text == "test folder/*file[test]*");
-            }
-        }
-    }
-}