From a32892926c69ea0bad031fd9d7bfc915cc5e9b68 Mon Sep 17 00:00:00 2001
From: Matthias Grob <maetugr@gmail.com>
Date: Thu, 12 Mar 2020 12:47:25 +0100
Subject: [PATCH] Matrix: capture stdout for print() test

I want to switch the print() function back to use printf()
such that it's fully compatible with all (embedded) platforms.

To still test the print function I'm capturing stdout into a file
such that the print() function can stay unchanged and the result of
the printf()s can be evaluated.
---
 matrix/Matrix.hpp         |  4 ++--
 test/matrixAssignment.cpp | 12 ++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/matrix/Matrix.hpp b/matrix/Matrix.hpp
index 4af752bb3e..93077a8182 100644
--- a/matrix/Matrix.hpp
+++ b/matrix/Matrix.hpp
@@ -350,13 +350,13 @@ public:
         }
     }
 
-    void print(FILE *stream = stdout) const
+    void print() const
     {
         // element: tab, point, 8 digits, 4 scientific notation chars; row: newline; string: \0 end
         static const size_t n = 15*N*M + M + 1;
         char * buf = new char[n];
         write_string(buf, n);
-        fprintf(stream, "%s\n", buf);
+        printf("%s\n", buf);
         delete[] buf;
     }
 
diff --git a/test/matrixAssignment.cpp b/test/matrixAssignment.cpp
index 42523f4ca2..052b8d6cc8 100644
--- a/test/matrixAssignment.cpp
+++ b/test/matrixAssignment.cpp
@@ -235,13 +235,13 @@ int main()
     }
 
     // check print()
+    // Redirect stdout
+    TEST(freopen("testoutput.txt", "w", stdout) != NULL);
     // write
-    FILE *fp = fopen("testoutput.txt", "w+");
-    TEST(fp != nullptr);
-    Comma.print(fp);
-    TEST(!fclose(fp));
+    Comma.print();
+    fclose(stdout);
     // read
-    fp = fopen("testoutput.txt", "r");
+    FILE *fp = fopen("testoutput.txt", "r");
     TEST(fp != nullptr);
     TEST(!fseek(fp, 0, SEEK_SET));
     for (size_t i = 0; i < len; i++) {
@@ -249,7 +249,7 @@ int main()
         if (c == '\n') {
             break;
         }
-        printf("%d %d %c\n", static_cast<int>(i), c, c);
+        printf("%d %d %d\n", static_cast<int>(i), output[i], c);
         TEST(c == output[i]);
     }
     TEST(!fclose(fp));