diff --git a/apps/graph/test/caching.cpp b/apps/graph/test/caching.cpp
index bef20e35d..5448699fc 100644
--- a/apps/graph/test/caching.cpp
+++ b/apps/graph/test/caching.cpp
@@ -10,7 +10,7 @@ namespace Graph {
 bool floatEquals(float a, float b, float tolerance = 1.f/static_cast<float>(Ion::Display::Height)) {
   /* The default value for the tolerance is chosen so that the error introduced
    * by caching would not typically be visible on screen. */
-  return a == b || std::abs(a - b) <= tolerance * std::abs(a + b) / 2.f || (std::isnan(a) && std::isnan(b));
+  return (std::isnan(a) && std::isnan(b)) || IsApproximatelyEqual(a, b, tolerance, 0.);
 }
 
 void assert_check_cartesian_cache_against_function(ContinuousFunction * function, ContinuousFunctionCache * cache, Context * context, float tMin) {
diff --git a/apps/graph/test/helper.h b/apps/graph/test/helper.h
index 69fe91edb..727022bf6 100644
--- a/apps/graph/test/helper.h
+++ b/apps/graph/test/helper.h
@@ -2,6 +2,7 @@
 #define APPS_GRAPH_TEST_HELPER_H
 
 #include "../app.h"
+#include "../../poincare/test/helper.h"
 
 using namespace Poincare;
 using namespace Shared;
@@ -12,10 +13,6 @@ constexpr ContinuousFunction::PlotType Cartesian = ContinuousFunction::PlotType:
 constexpr ContinuousFunction::PlotType Polar = ContinuousFunction::PlotType::Polar;
 constexpr ContinuousFunction::PlotType Parametric = ContinuousFunction::PlotType::Parametric;
 
-constexpr Preferences::AngleUnit Radian = Preferences::AngleUnit::Radian;
-constexpr Preferences::AngleUnit Degree = Preferences::AngleUnit::Degree;
-constexpr Preferences::AngleUnit Gradian = Preferences::AngleUnit::Gradian;
-
 ContinuousFunction * addFunction(const char * definition, ContinuousFunction::PlotType type, ContinuousFunctionStore * store, Context * context);
 
 }
diff --git a/apps/graph/test/ranges.cpp b/apps/graph/test/ranges.cpp
index 85c6605df..5056fd343 100644
--- a/apps/graph/test/ranges.cpp
+++ b/apps/graph/test/ranges.cpp
@@ -8,6 +8,9 @@ namespace Graph {
 
 class AdHocGraphController : public InteractiveCurveViewRangeDelegate {
 public:
+  /* These margins are obtained from instance methods of the various derived
+   * class of SimpleInteractiveCurveViewController. As we cannot create an
+   * instance of this class here, we define those directly. */
   static constexpr float k_topMargin = 0.068f;
   static constexpr float k_bottomMargin = 0.132948f;
   static constexpr float k_leftMargin = 0.04f;
@@ -30,7 +33,7 @@ private:
 };
 
 bool float_equal(float a, float b, float tolerance = 10.f * FLT_EPSILON) {
-  return std::fabs(a - b) <= tolerance * std::fabs(a + b);
+  return IsApproximatelyEqual(a, b, tolerance, 0.);
 }
 
 template <size_t N>
diff --git a/poincare/test/zoom.cpp b/poincare/test/zoom.cpp
index 66d34c463..2f43edfb7 100644
--- a/poincare/test/zoom.cpp
+++ b/poincare/test/zoom.cpp
@@ -7,7 +7,7 @@ using namespace Poincare;
 
 // When adding the graph window margins, this ratio gives an orthonormal window
 constexpr float NormalRatio = 0.442358822;
-constexpr float StandardTolerance = 10.f * FLT_EPSILON;
+constexpr float StandardTolerance = 50.f * FLT_EPSILON;
 
 class ParametersPack {
 public:
@@ -35,7 +35,7 @@ float evaluate_expression(float x, Context * context, const void * auxiliary) {
 bool float_equal(float a, float b, float tolerance = StandardTolerance) {
   assert(std::isfinite(tolerance));
   return !(std::isnan(a) || std::isnan(b))
-      && std::fabs(a - b) <= tolerance * std::fabs(a + b);
+      && IsApproximatelyEqual(a, b, tolerance, 0.);
 }
 
 bool range1D_matches(float min, float max, float targetMin, float targetMax, float tolerance = StandardTolerance) {