diff --git a/cpp/ql/test/library-tests/preprocessor/preprocessor/pp.cpp b/cpp/ql/test/library-tests/preprocessor/preprocessor/pp.cpp
index 70fada58da98..651a1d7f28b0 100644
--- a/cpp/ql/test/library-tests/preprocessor/preprocessor/pp.cpp
+++ b/cpp/ql/test/library-tests/preprocessor/preprocessor/pp.cpp
@@ -10,7 +10,7 @@
 // semmle-extractor-options: -I${testdir}/more_headers/ "-U SOME_SYM"
 #undef BAR
 #define SCARY(a,aa,aaah) /* we ignore a */ (aa /* but we take aa */) /* and we ignore aaa */
-#define LOG(fmt, ...)  printf("Warning: %s", fmt, __VA__ARGS__)  
+#define LOG(fmt, ...)  printf("Warning: %s", fmt, __VA__ARGS__)
 #include "pp.h"
 
 #if 0
@@ -59,7 +59,7 @@ class templateClassContext
 	#else
 		#define IN_TEMPLATE
 	#endif
-	
+
 	static int val;
 };
 
@@ -71,7 +71,43 @@ templateClassContext<int> tcci;
 
 #define BAR
 
-#if defined(BAR) && \
+#if defined(BAR) &&\
   defined(BAR)
 #warning BAR defined
 #endif
+
+#if defined MACROTHREE/**hello*/ && /*world*/\
+/*hw*/(defined(MACROONE)) /* macroone */
+#endif
+
+#if defined SIMPLE_COMMENT  //this comment \
+     (defined(SIMPLE_COMMENT)) spans over multiple lines
+#endif
+
+#if defined(FOO) &&\
+    defined(BAR)
+#define CONDITIONAL_MACRO_1 1
+#endif
+
+#if defined(FOO) && \
+    defined(BAR) && \
+    !defined(BAZ)
+#define CONDITIONAL_MACRO_2 2
+#endif
+
+#define FOO 8
+#define BAR 2
+#define BAZ 4
+#if ((FOO / BAR) \
+   == 4) && ((BAZ \
+   * QUX) \
+   > 10)
+#define CONDITIONAL_MACRO_3 3
+#endif
+
+// Testing \t spaced PreprocessorIf
+#if defined(FOO)	&&	\
+	defined(BAR)	&&	\
+	defined(BAZ)
+#define CONDITIONAL_MACRO_4 4
+#endif
diff --git a/cpp/ql/test/library-tests/preprocessor/preprocessor/preproc.expected b/cpp/ql/test/library-tests/preprocessor/preprocessor/preproc.expected
index d1b64ff7bd92..0a472deafbe0 100644
--- a/cpp/ql/test/library-tests/preprocessor/preprocessor/preproc.expected
+++ b/cpp/ql/test/library-tests/preprocessor/preprocessor/preproc.expected
@@ -38,12 +38,28 @@
 | pp.cpp:0:0:0:0 | pp.cpp | 61 | 1 | 61 | 7 | PreprocessorEndif | N/A | N/A |
 | pp.cpp:0:0:0:0 | pp.cpp | 69 | 1 | 69 | 21 | Macro | INSTANTIATION |  |
 | pp.cpp:0:0:0:0 | pp.cpp | 72 | 1 | 72 | 11 | Macro | BAR |  |
-| pp.cpp:0:0:0:0 | pp.cpp | 74 | 1 | 74 | 21 | PreprocessorIf | defined(BAR) && \\ | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 74 | 1 | 75 | 13 | PreprocessorIf | defined(BAR) && defined(BAR) | N/A |
 | pp.cpp:0:0:0:0 | pp.cpp | 76 | 1 | 76 | 20 | PreprocessorWarning | BAR defined | N/A |
 | pp.cpp:0:0:0:0 | pp.cpp | 77 | 1 | 77 | 6 | PreprocessorEndif | N/A | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 79 | 1 | 80 | 18 | PreprocessorIf | defined MACROTHREE && (defined(MACROONE)) | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 81 | 1 | 81 | 6 | PreprocessorEndif | N/A | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 83 | 1 | 84 | 26 | PreprocessorIf | defined SIMPLE_COMMENT | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 85 | 1 | 85 | 6 | PreprocessorEndif | N/A | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 87 | 1 | 88 | 15 | PreprocessorIf | defined(FOO) && defined(BAR) | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 90 | 1 | 90 | 6 | PreprocessorEndif | N/A | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 92 | 1 | 94 | 14 | PreprocessorIf | defined(FOO) && defined(BAR) && !defined(BAZ) | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 96 | 1 | 96 | 6 | PreprocessorEndif | N/A | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 98 | 1 | 98 | 13 | Macro | FOO | 8 |
+| pp.cpp:0:0:0:0 | pp.cpp | 99 | 1 | 99 | 13 | Macro | BAR | 2 |
+| pp.cpp:0:0:0:0 | pp.cpp | 100 | 1 | 100 | 13 | Macro | BAZ | 4 |
+| pp.cpp:0:0:0:0 | pp.cpp | 101 | 1 | 104 | 3 | PreprocessorIf | ((FOO / BAR) == 4) && ((BAZ * QUX) > 10) | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 106 | 1 | 106 | 6 | PreprocessorEndif | N/A | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 109 | 1 | 111 | 10 | PreprocessorIf | defined(FOO) && defined(BAR) && defined(BAZ) | N/A |
+| pp.cpp:0:0:0:0 | pp.cpp | 112 | 1 | 112 | 29 | Macro | CONDITIONAL_MACRO_4 | 4 |
+| pp.cpp:0:0:0:0 | pp.cpp | 113 | 1 | 113 | 6 | PreprocessorEndif | N/A | N/A |
 | pp.h:0:0:0:0 | pp.h | 1 | 1 | 1 | 12 | PreprocessorPragma | once | N/A |
 | pp.h:0:0:0:0 | pp.h | 2 | 1 | 2 | 29 | PreprocessorWarning | "This should happen" | N/A |
-| pp.h:0:0:0:0 | pp.h | 3 | 1 | 3 | 27 | PreprocessorLine | 33  "emerald_city.h" | N/A |
+| pp.h:0:0:0:0 | pp.h | 3 | 1 | 3 | 27 | PreprocessorLine | 33 "emerald_city.h" | N/A |
 | pp.h:0:0:0:0 | pp.h | 4 | 1 | 4 | 30 | PreprocessorPragma | byte_order(big_endian) | N/A |
 | pp.h:0:0:0:0 | pp.h | 5 | 1 | 5 | 33 | PreprocessorWarning | "Not in Kansas any more" | N/A |
 | pp.h:0:0:0:0 | pp.h | 7 | 1 | 11 | 8 | Macro | MULTILINE | world a long |