diff --git a/test/testmathlib.cpp b/test/testmathlib.cpp
index 9535d734d..d8f75f283 100644
--- a/test/testmathlib.cpp
+++ b/test/testmathlib.cpp
@@ -345,31 +345,31 @@ private:
     }
 
     void toDoubleNumber() const {
-        ASSERT_EQUALS_DOUBLE(10.0  , MathLib::toDoubleNumber("10"));
-        ASSERT_EQUALS_DOUBLE(1000.0, MathLib::toDoubleNumber("10E+2"));
-        ASSERT_EQUALS_DOUBLE(100.0 , MathLib::toDoubleNumber("1.0E+2"));
-        ASSERT_EQUALS_DOUBLE(-100.0, MathLib::toDoubleNumber("-1.0E+2"));
-        ASSERT_EQUALS_DOUBLE(-1e+10, MathLib::toDoubleNumber("-1.0E+10"));
-        ASSERT_EQUALS_DOUBLE(100.0 , MathLib::toDoubleNumber("+1.0E+2"));
-        ASSERT_EQUALS_DOUBLE(1e+10 , MathLib::toDoubleNumber("+1.0E+10"));
-        ASSERT_EQUALS_DOUBLE(100.0 , MathLib::toDoubleNumber("1.0E+2"));
-        ASSERT_EQUALS_DOUBLE(1e+10 , MathLib::toDoubleNumber("1.0E+10"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E+0"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E-0"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E+00"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E-00"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0E+00"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0E-00"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0."));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0.0"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0."));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0."));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0.0"));
-        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0.0"));
-        ASSERT_EQUALS_DOUBLE('0'   , MathLib::toDoubleNumber("'0'"));
+        ASSERT_EQUALS_DOUBLE(10.0  , MathLib::toDoubleNumber("10"),       0.001);
+        ASSERT_EQUALS_DOUBLE(1000.0, MathLib::toDoubleNumber("10E+2"),    0.001);
+        ASSERT_EQUALS_DOUBLE(100.0 , MathLib::toDoubleNumber("1.0E+2"),   0.001);
+        ASSERT_EQUALS_DOUBLE(-100.0, MathLib::toDoubleNumber("-1.0E+2"),  0.001);
+        ASSERT_EQUALS_DOUBLE(-1e+10, MathLib::toDoubleNumber("-1.0E+10"), 1);
+        ASSERT_EQUALS_DOUBLE(100.0 , MathLib::toDoubleNumber("+1.0E+2"),  0.001);
+        ASSERT_EQUALS_DOUBLE(1e+10 , MathLib::toDoubleNumber("+1.0E+10"), 1);
+        ASSERT_EQUALS_DOUBLE(100.0 , MathLib::toDoubleNumber("1.0E+2"),   0.001);
+        ASSERT_EQUALS_DOUBLE(1e+10 , MathLib::toDoubleNumber("1.0E+10"),  1);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E+0"),     0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E-0"),     0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E+00"),    0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0E-00"),    0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0E+00"),   0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0E-00"),   0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0"),        0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0."),       0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("0.0"),      0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0"),       0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0"),       0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0."),      0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0."),      0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("-0.0"),     0.000001);
+        ASSERT_EQUALS_DOUBLE(0.0   , MathLib::toDoubleNumber("+0.0"),     0.000001);
+        ASSERT_EQUALS_DOUBLE('0'   , MathLib::toDoubleNumber("'0'"),      0.000001);
 
         // verify: string --> double --> string conversion
         ASSERT_EQUALS("1.0" , MathLib::toString(MathLib::toDoubleNumber("1.0f")));
diff --git a/test/testsuite.cpp b/test/testsuite.cpp
index 200b0f017..4c3217a1a 100644
--- a/test/testsuite.cpp
+++ b/test/testsuite.cpp
@@ -192,9 +192,9 @@ void TestFixture::assertEquals(const char *filename, unsigned int linenr, long l
     }
 }
 
-void TestFixture::assertEqualsDouble(const char *filename, unsigned int linenr, double expected, double actual, const std::string &msg) const
+void TestFixture::assertEqualsDouble(const char *filename, unsigned int linenr, double expected, double actual, double tolerance, const std::string &msg) const
 {
-    if (expected != actual) {
+    if (expected < (actual - tolerance) || expected > (actual + tolerance)) {
         std::ostringstream ostr1;
         ostr1 << expected;
         std::ostringstream ostr2;
diff --git a/test/testsuite.h b/test/testsuite.h
index 5c08fd455..1e9c197cd 100644
--- a/test/testsuite.h
+++ b/test/testsuite.h
@@ -55,7 +55,7 @@ protected:
     void assertEquals(const char *filename, unsigned int linenr, const char expected[], const char actual[], const std::string &msg = emptyString) const;
     void assertEquals(const char *filename, unsigned int linenr, const std::string& expected, const char actual[], const std::string &msg = emptyString) const;
     void assertEquals(const char *filename, unsigned int linenr, long long expected, long long actual, const std::string &msg = emptyString) const;
-    void assertEqualsDouble(const char *filename, unsigned int linenr, double expected, double actual, const std::string &msg = emptyString) const;
+    void assertEqualsDouble(const char *filename, unsigned int linenr, double expected, double actual, double tolerance, const std::string &msg = emptyString) const;
 
     void todoAssertEquals(const char *filename, unsigned int linenr, const std::string &wanted,
                           const std::string &current, const std::string &actual) const;
@@ -87,7 +87,7 @@ extern std::ostringstream output;
 #define ASSERT( CONDITION )  assert_(__FILE__, __LINE__, CONDITION)
 #define ASSERT_EQUALS( EXPECTED , ACTUAL )  assertEquals(__FILE__, __LINE__, EXPECTED, ACTUAL)
 #define ASSERT_EQUALS_WITHOUT_LINENUMBERS( EXPECTED , ACTUAL )  assertEqualsWithoutLineNumbers(__FILE__, __LINE__, EXPECTED, ACTUAL)
-#define ASSERT_EQUALS_DOUBLE( EXPECTED , ACTUAL )  assertEqualsDouble(__FILE__, __LINE__, EXPECTED, ACTUAL)
+#define ASSERT_EQUALS_DOUBLE( EXPECTED , ACTUAL, TOLERANCE )  assertEqualsDouble(__FILE__, __LINE__, EXPECTED, ACTUAL, TOLERANCE)
 #define ASSERT_EQUALS_MSG( EXPECTED , ACTUAL, MSG )  assertEquals(__FILE__, __LINE__, EXPECTED, ACTUAL, MSG)
 #define ASSERT_THROW( CMD, EXCEPTION ) try { CMD ; assertThrowFail(__FILE__, __LINE__); } catch (const EXCEPTION&) { } catch (...) { assertThrowFail(__FILE__, __LINE__); }
 #define ASSERT_NO_THROW( CMD ) try { CMD ; } catch (...) { assertNoThrowFail(__FILE__, __LINE__); }