diff --git a/src/epics/simLink/lib/cdsAtan2.mdl b/src/epics/simLink/lib/cdsAtan2.mdl
new file mode 100644
index 0000000000000000000000000000000000000000..66ce75a5db42a775468e746e3cb6a16c08b7ee8e
--- /dev/null
+++ b/src/epics/simLink/lib/cdsAtan2.mdl
@@ -0,0 +1,1163 @@
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diff --git a/src/epics/simLink/lib/cdsUnwrapPhase.mdl b/src/epics/simLink/lib/cdsUnwrapPhase.mdl
new file mode 100644
index 0000000000000000000000000000000000000000..849cccbf3f30b77d9feef448d0065aa436a37e62
--- /dev/null
+++ b/src/epics/simLink/lib/cdsUnwrapPhase.mdl
@@ -0,0 +1,1166 @@
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+  }
+  HideAutomaticNames	  on
+  Created		  "Mon Jul 17 15:03:57 2006"
+  Creator		  "rolfbork"
+  UpdateHistory		  "UpdateHistoryNever"
+  ModifiedByFormat	  "%<Auto>"
+  LastModifiedBy	  "ezekiel.dohmen"
+  ModifiedDateFormat	  "%<Auto>"
+  LastModifiedDate	  "Mon Jul 24 13:31:32 2023"
+  RTWModifiedTimeStamp	  612106243
+  ModelVersionFormat	  "1.%<AutoIncrement:10>"
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+      Unit		      "inherit"
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+      VarSizeSig	      "Inherit"
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+      SamplingMode	      "auto"
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+    Block {
+      BlockType		      Outport
+      Port		      "1"
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+      Unit		      "inherit"
+      PortDimensions	      "-1"
+      VarSizeSig	      "Inherit"
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+      SamplingMode	      "auto"
+      EnsureOutportIsVirtual  off
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+    Block {
+      BlockType		      SubSystem
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+      Permissions	      "ReadWrite"
+      PermitHierarchicalResolution "All"
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+      PropExecContextOutsideSubsystem off
+      ScheduleAs	      "Sample time"
+      SystemSampleTime	      "-1"
+      RTWSystemCode	      "Auto"
+      RTWFcnNameOpts	      "Auto"
+      RTWFileNameOpts	      "Auto"
+      FunctionInterfaceSpec   "void_void"
+      FunctionWithSeparateData off
+      RTWMemSecFuncInitTerm   "Inherit from model"
+      RTWMemSecFuncExecute    "Inherit from model"
+      RTWMemSecDataConstants  "Inherit from model"
+      RTWMemSecDataInternal   "Inherit from model"
+      RTWMemSecDataParameters "Inherit from model"
+      SimViewingDevice	      off
+      DataTypeOverride	      "UseLocalSettings"
+      DataTypeOverrideAppliesTo	"AllNumericTypes"
+      MinMaxOverflowLogging   "UseLocalSettings"
+      Opaque		      off
+      MaskHideContents	      off
+      SFBlockType	      "NONE"
+      VariantControlMode      "Expression"
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+      IsWebBlockPanel	      off
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+  }
+  System {
+    Name		    "cdsUnwrapPhase"
+    Location		    [2624, 199, 3409, 822]
+    Open		    on
+    PortBlocksUseCompactNotation off
+    SetExecutionDomain	    off
+    ExecutionDomainType	    "Deduce"
+    ModelBrowserVisibility  off
+    ModelBrowserWidth	    200
+    ScreenColor		    "white"
+    PaperOrientation	    "landscape"
+    PaperPositionMode	    "auto"
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+    PaperUnits		    "inches"
+    TiledPaperMargins	    [0.500000, 0.500000, 0.500000, 0.500000]
+    TiledPageScale	    1
+    ShowPageBoundaries	    off
+    ZoomFactor		    "100"
+    ReportName		    "simulink-default.rpt"
+    SIDHighWatermark	    "11"
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+    Block {
+      BlockType		      Inport
+      Name		      "In1"
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+      Position		      [110, 78, 140, 92]
+      ZOrder		      -2
+      IconDisplay	      "Port number"
+    }
+    Block {
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+      SID		      "9"
+      Position		      [110, 113, 140, 127]
+      ZOrder		      -3
+      Port		      "2"
+      IconDisplay	      "Port number"
+    }
+    Block {
+      BlockType		      SubSystem
+      Name		      "phaseUnwrap_0"
+      SID		      "1"
+      Tag		      "cdsUnwrapPhase"
+      Ports		      [2, 1]
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+      DropShadow	      on
+      AttributesFormatString  "%<Tag>"
+      FontName		      "Liberation Sans"
+      RequestExecContextInheritance off
+      Object {
+	$PropName		"MaskObject"
+	$ObjectID		19
+	$ClassName		"Simulink.Mask"
+	Display			"disp(char(248))\nport_label('input', 1, 'in')\nport_label('input', 2, 'reset')\nport_label('output', 1, 'out')"
+	RunInitForIconRedraw	"off"
+      }
+      System {
+	Name			"phaseUnwrap_0"
+	Location		[2624, 199, 3409, 822]
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+	SetExecutionDomain	off
+	ExecutionDomainType	"Deduce"
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+	ModelBrowserWidth	200
+	ScreenColor		"white"
+	PaperOrientation	"landscape"
+	PaperPositionMode	"auto"
+	PaperType		"usletter"
+	PaperUnits		"inches"
+	TiledPaperMargins	[0.500000, 0.500000, 0.500000, 0.500000]
+	TiledPageScale		1
+	ShowPageBoundaries	off
+	ZoomFactor		"100"
+	SimulinkSubDomain	"Simulink"
+	Block {
+	  BlockType		  Inport
+	  Name			  "in"
+	  SID			  "2"
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+	  ZOrder		  -1
+	  IconDisplay		  "Port number"
+	}
+	Block {
+	  BlockType		  Inport
+	  Name			  "reset"
+	  SID			  "3"
+	  Position		  [25, 63, 55, 77]
+	  ZOrder		  -2
+	  Port			  "2"
+	  IconDisplay		  "Port number"
+	}
+	Block {
+	  BlockType		  Outport
+	  Name			  "out"
+	  SID			  "6"
+	  Position		  [180, -2, 210, 12]
+	  ZOrder		  -5
+	  IconDisplay		  "Port number"
+	}
+      }
+    }
+    Block {
+      BlockType		      Outport
+      Name		      "Out1"
+      SID		      "10"
+      Position		      [335, 98, 365, 112]
+      ZOrder		      -4
+      IconDisplay	      "Port number"
+    }
+    Line {
+      ZOrder		      1
+      SrcBlock		      "In1"
+      SrcPort		      1
+      DstBlock		      "phaseUnwrap_0"
+      DstPort		      1
+    }
+    Line {
+      ZOrder		      2
+      SrcBlock		      "phaseUnwrap_0"
+      SrcPort		      1
+      DstBlock		      "Out1"
+      DstPort		      1
+    }
+    Line {
+      ZOrder		      3
+      SrcBlock		      "In2"
+      SrcPort		      1
+      DstBlock		      "phaseUnwrap_0"
+      DstPort		      2
+    }
+  }
+}
diff --git a/src/epics/util/lib/Atan2.pm b/src/epics/util/lib/Atan2.pm
new file mode 100644
index 0000000000000000000000000000000000000000..bf121711d0f7aeccb930370d363c2d01f4e8b108
--- /dev/null
+++ b/src/epics/util/lib/Atan2.pm
@@ -0,0 +1,63 @@
+package CDS::Atan2;
+use Exporter;
+@ISA = ('Exporter');
+
+sub partType {
+    return Atan2;
+}
+
+# Print Epics communication structure into a header file
+# Current part number is passed as first argument
+sub printHeaderStruct {
+    my ($i) = @_;
+}
+
+# Print Epics variable definitions
+# Current part number is passed as first argument
+sub printEpics {
+    my ($i) = @_;
+}
+
+
+# Print variable declarations int front-end file
+# Current part number is passed as first argument
+sub printFrontEndVars  {
+    my ($i) = @_;
+    print ::OUT "double \L$::xpartName[$i];\n";
+}
+
+# Check inputs are connected
+sub checkInputConnect {
+    my ($i) = @_;
+    if($::partInCnt[$i] < 2) {
+        print ::CONN_ERRORS "***\n$::partType[$i] with name $::xpartName[$i] does not have both inputs connected.\n\n";
+        return "ERROR";
+    }
+    return "";
+}
+
+# Figure out part input code
+# Argument 1 is the part number
+# Argument 2 is the input number
+# Returns calculated input code
+sub fromExp {
+    my ($i, $j) = @_;
+    return "";
+}
+
+# Return front end initialization code
+# Argument 1 is the part number
+# Returns calculated code string
+sub frontEndInitCode {
+}
+
+
+# Return front end code
+# Argument 1 is the part number
+# Returns calculated code string
+sub frontEndCode {
+    my ($i) = @_;
+    my $calcExp = "\L$::xpartName[$i]" . " = latan2($::fromExp[0], $::fromExp[1]);\n";
+    return $calcExp;
+}
+
diff --git a/src/epics/util/lib/UnwrapPhase.pm b/src/epics/util/lib/UnwrapPhase.pm
new file mode 100644
index 0000000000000000000000000000000000000000..3b5d607ef0b50283bd3db6e08f3bfa3f6f7595ef
--- /dev/null
+++ b/src/epics/util/lib/UnwrapPhase.pm
@@ -0,0 +1,82 @@
+package CDS::UnwrapPhase;
+use Exporter;
+@ISA = ('Exporter');
+
+#//     \page UnwrapPhase UnwrapPhase.pm
+#//     Documentation for UnwrapPhase.pm
+#//
+#// \n
+
+
+sub partType {
+	return UnwrapPhase;
+}
+
+# Print Epics communication structure into a header file
+# Current part number is passed as first argument
+sub printHeaderStruct {
+        my ($i) = @_;
+        #print ::OUTH "\tdouble $::xpartName[$i]\_E;\n";
+        #print ::OUTH "\tdouble $::xpartName[$i]\[2\];\n";
+}
+
+# Print Epics variable definitions
+# Current part number is passed as first argument
+sub printEpics {
+    my ($i) = @_;
+    #print ::EPICS "PHASE $::xpartName[$i] $::systemName\.$::xpartName[$i] double ai 0 field(PREC,\"3\")\n";
+}
+
+
+# Print variable declarations int front-end file
+# Current part number is passed as first argument
+sub printFrontEndVars  {
+        my ($i) = @_;
+        print ::OUT "static double \L$::xpartName[$i];\n";
+        print ::OUT "static unwrapPhaseCtx_t \L$::xpartName[$i]_ctx;\n";
+}
+
+# Check inputs are connected
+sub checkInputConnect {
+    my ($i) = @_;
+    if($::partInCnt[$i] < 2) {
+        print ::CONN_ERRORS "***\n$::partType[$i] with name $::xpartName[$i] has missing inputs\nRequires 2; Only $::partInCnt[$i] provided:  \n";
+        return "ERROR";
+    }
+    return "";
+}
+
+# Figure out part input code
+# Argument 1 is the part number
+# Argument 2 is the input number
+# Returns calculated input code
+sub fromExp {
+    my ($i, $j) = @_;
+    #my $from = $::partInNum[$i][$j];
+    #my $fromPort = $::partInputPort[$i][$j];
+    #return "\L$::xpartName[$from]\[" . $fromPort . "\]";
+    return "";
+}
+
+# Return front end initialization code
+# Argument 1 is the part number
+# Returns calculated code string
+sub frontEndInitCode {
+	my ($i) = @_;
+    my $pname = "\L$::xpartName[$i]_ctx";
+	return $pname . ".firstRun = 1;";
+}
+
+
+# Return front end code
+# Argument 1 is the part number
+# Returns calculated code string
+sub frontEndCode {
+    my ($i) = @_;
+    my $calcExp = "// UnwrapPhase:  $::xpartName[$i]\n";
+    
+    $calcExp .= "\L$::xpartName[$i] = ";
+    $calcExp .= "unwrapPhase( $::fromExp[0], $::fromExp[1], &" . "\L$::xpartName[$i]_ctx" . ");\n";
+
+    return $calcExp;
+}
diff --git a/src/include/fe.h b/src/include/fe.h
index bd4013f6d5e3931fc495744c6916ad88add9f695..3aa0a2675d0cc4e410e6efcd10cee502b79e28fa 100644
--- a/src/include/fe.h
+++ b/src/include/fe.h
@@ -10,6 +10,7 @@
 #include "util/timing.h"
 #include "util/random_bytes.h"
 #include "util/prng_xoroshiroPP.h"
+#include "util/unwrapPhase.h"
 #include "fm10Gen.h"
 #include "tRamp.h"
 #include "commData3.h"
diff --git a/src/include/util/inlineMath_x86_asm.h b/src/include/util/inlineMath_x86_asm.h
index 131fd8e3813f5c7bce1c8dedd64803741cad37da..7dd1141074011827d74a5160a9729f23cd8cd582 100644
--- a/src/include/util/inlineMath_x86_asm.h
+++ b/src/include/util/inlineMath_x86_asm.h
@@ -5,6 +5,7 @@
 
 #define M_PI 3.14159265358979323846
 #define M_TWO_PI 6.28318530717958647692
+#define M_HALF_PI 1.570796326794896619231
 #define M_SQRT2 1.41421356237309504880
 
 
diff --git a/src/include/util/unwrapPhase.h b/src/include/util/unwrapPhase.h
new file mode 100644
index 0000000000000000000000000000000000000000..7f398edbd4162a17ee2e7789b3740cd9d408eafc
--- /dev/null
+++ b/src/include/util/unwrapPhase.h
@@ -0,0 +1,69 @@
+#include "portableInline.h"
+#include "util/inlineMath.h"
+
+typedef struct unwrapPhaseCtx_t
+{
+    int k;
+    int firstRun;
+
+    double  uLast;
+    double  uThis;
+
+} unwrapPhaseCtx_t;
+
+LIGO_INLINE double unwrapPhase(double cur_sample, double reset, unwrapPhaseCtx_t * ctx) 
+{
+    /*      This block of code is supposed to take the output of the atan code for the SPI and unwrap any phase
+     *       jumps of greater than pi. This is similar to the MATLAB simulink unwrap block except that the reset
+     *       is a seperate input instead of either continuously running or going frame to frame. This means that
+     *       the system can be reset to zero fringes at any point.
+     *
+     *       Daniel Clark - Stanford University 2011.06.27
+     *
+     */
+
+
+    double uwrapout;
+    double compare;
+
+
+
+    /*      Some special cases for the first time the code is run - this means that we will miss a phase jump
+     *       if it happens between the first and second data point */
+    if (ctx->firstRun == 1) {
+        ctx->uLast = cur_sample;
+        ctx->k = 0.0;
+        ctx->firstRun = 0;
+    }
+
+    /*      Reset the phase / fringe counter to zero if desired */
+    if (reset > 0.5) {
+        ctx->k = 0;
+    }
+
+
+    /*      Collect the difference of the last two data points to determine if unwrapping is necessary */
+    compare = cur_sample - ctx->uLast;
+
+    /*      Now take the absolute value of the difference */
+    if (compare < 0.0) {
+        compare = compare * -1.0;
+    }
+
+    /*      Use the last value of k if no unwrapping is needed */
+    if (compare < M_PI) {
+        uwrapout = cur_sample + M_HALF_PI * 4.0 * ctx->k;
+    }
+    else {
+        if (cur_sample < ctx->uLast) {
+            ctx->k += 1;
+        }
+        else {
+            ctx->k -= 1;
+        }
+        uwrapout = cur_sample + M_HALF_PI * 4.0 * ctx->k;
+    }
+    ctx->uLast = cur_sample;
+    return uwrapout;
+}
+
diff --git a/src/include/util/user/inlineMath_stdlib.h b/src/include/util/user/inlineMath_stdlib.h
index 489b6f4c3bc4a1679681795ff6f29d3e753c2457..3ea3ad987f784c2361e5f05d853118459b14ac3d 100644
--- a/src/include/util/user/inlineMath_stdlib.h
+++ b/src/include/util/user/inlineMath_stdlib.h
@@ -32,6 +32,9 @@
 #define lfloor floor
 #define lfmon fmod
 
+//Define anything else that LIGO needs
+#define M_HALF_PI 1.570796326794896619231
+
 #ifdef __APPLE__
 #define sincos __sincos
 #endif
diff --git a/src/librts/CMakeLists.txt b/src/librts/CMakeLists.txt
index c5499c9468b2a5839acad484b09ed91b090c00d2..b7ea5c9e2cb9f5eb567aff34a8581bcd193c70e3 100644
--- a/src/librts/CMakeLists.txt
+++ b/src/librts/CMakeLists.txt
@@ -79,4 +79,5 @@ add_subdirectory(tests/math-function-test)
 add_subdirectory(tests/product-divide-sum-test)
 add_subdirectory(tests/matrix-test)
 add_subdirectory(tests/osc-test)
+add_subdirectory(tests/python)
 endif()
diff --git a/src/librts/tests/math-function-test/main.cpp b/src/librts/tests/math-function-test/main.cpp
index 9a274b7a1528ddb9a9a6efa435ee2eea8e433c4d..603ea25e8d73e4878894f8b7c822ebac03a79218 100644
--- a/src/librts/tests/math-function-test/main.cpp
+++ b/src/librts/tests/math-function-test/main.cpp
@@ -58,7 +58,39 @@ TEST_CASE( "simple MathFunction tests", "[general]" )
 }
 
 
+TEST_CASE( "atan2 tests", "[general]" )
+{
+
+    std::unique_ptr<rts::Model> model_ptr = rts::Model::create_instance();
+    REQUIRE( model_ptr != nullptr);
+    const std::string subsys = "ATAN2_TEST_";
+
+
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_0", 0));
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_1", 0));
+    model_ptr->run_model(1);
+    REQUIRE(model_ptr->get_var<double>(subsys +  "ATAN2_OUTPUT_0").value() ==  Approx( 0.0 ));
+
+
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_0", 3.0));
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_1", 5.342));
+    model_ptr->run_model(1);
+    REQUIRE(model_ptr->get_var<double>(subsys +  "ATAN2_OUTPUT_0").value() ==  Approx( atan2(3, 5.342) ));
+
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_0", -43.1));
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_1", -55.1));
+    model_ptr->run_model(1);
+    REQUIRE(model_ptr->get_var<double>(subsys +  "ATAN2_OUTPUT_0").value() ==  Approx( atan2(-43.1, -55.1) ));
 
 
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_0", 3.1));
+    REQUIRE(model_ptr->set_var(subsys + "ATAN2_INPUT_1", 1.1));
+    model_ptr->run_model(1);
+    REQUIRE(model_ptr->get_var<double>(subsys +  "ATAN2_OUTPUT_0").value() ==  Approx( atan2(3.1, 1.1) ));
+
+
+
+
+}
 
 
diff --git a/src/librts/tests/python/CMakeLists.txt b/src/librts/tests/python/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4ac5d891e050b93d10d4515716b49d4577f29704
--- /dev/null
+++ b/src/librts/tests/python/CMakeLists.txt
@@ -0,0 +1,9 @@
+project (python-tests)
+
+find_package(Python COMPONENTS Interpreter REQUIRED)
+
+add_test(NAME unwrap-phase-test
+    COMMAND ${Python_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/unwrap-phase.py
+    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+set_tests_properties(unwrap-phase-test
+    PROPERTIES ENVIRONMENT "PYTHONPATH=${PROJECT_SOURCE_DIR}/../../build/cmake/python/pybind/:$ENV{PYTHONPATH}")
diff --git a/src/librts/tests/python/unwrap-phase.py b/src/librts/tests/python/unwrap-phase.py
new file mode 100755
index 0000000000000000000000000000000000000000..dc22eadc1d52bb0670891d0045c88597e55b5713
--- /dev/null
+++ b/src/librts/tests/python/unwrap-phase.py
@@ -0,0 +1,72 @@
+#!/usr/bin/env python3
+
+#import sys
+#sys.path.append('../../build/cmake/python/pybind/')
+import x1unittest_pybind as model #Built by rtslib
+
+import unittest
+import numpy as np
+from scipy import signal
+from math import isclose
+
+class TestUnwrapPhase(unittest.TestCase):
+
+
+
+    @classmethod
+    def setUpClass(cls):
+        pass
+        
+
+    def test_positive_unwrap(self):
+        mod = model.create_instance()
+        mod.record_model_var("UNWRAP_PHASE_TEST_OUTPUT_1", mod.get_model_rate_Hz())
+        input_complex = np.fft.ifft([0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
+        phase_data = np.angle(input_complex)
+        mod.set_excitation_point_generator("UNWRAP_PHASE_TEST_EXC_0", model.CannedSignalGenerator( canned_data=phase_data, repeat=False))
+        mod.run_model( len(phase_data) ) 
+        np_unwrapped = np.unwrap(phase_data)
+        unwrap_out = mod.get_recorded_var("UNWRAP_PHASE_TEST_OUTPUT_1")
+        for i in range(len(phase_data)):
+            self.assertTrue(isclose(unwrap_out[i], np_unwrapped[i], rel_tol=1e-12, abs_tol=0.0))
+
+    def test_negative_unwrap(self): 
+        mod = model.create_instance()
+        mod.record_model_var("UNWRAP_PHASE_TEST_OUTPUT_1", mod.get_model_rate_Hz())
+        input_complex = np.fft.ifft([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0])
+        phase_data = np.angle(input_complex)
+        mod.set_excitation_point_generator("UNWRAP_PHASE_TEST_EXC_0", model.CannedSignalGenerator( canned_data=phase_data, repeat=False))
+        mod.run_model( len(phase_data) ) 
+        np_unwrapped = np.unwrap(phase_data)
+        unwrap_out = mod.get_recorded_var("UNWRAP_PHASE_TEST_OUTPUT_1")
+        for i in range(len(phase_data)):
+            self.assertTrue(isclose(unwrap_out[i], np_unwrapped[i], rel_tol=1e-12, abs_tol=0.0))
+
+    def test_random_unwrap(self): 
+        for tests in range(20):
+            mod = model.create_instance( )
+            mod.record_model_var("UNWRAP_PHASE_TEST_OUTPUT_1", mod.get_model_rate_Hz())
+
+            n = np.zeros((400,), dtype=complex)
+            n[40:60] = np.exp(1j*np.random.uniform(0, 2*np.pi, (20,)))
+            input_complex = np.fft.ifft(n)
+
+            phase_data = np.angle(input_complex)
+            mod.set_excitation_point_generator("UNWRAP_PHASE_TEST_EXC_0", model.CannedSignalGenerator( canned_data=phase_data, repeat=False))
+            mod.run_model( len(phase_data) ) 
+            np_unwrapped = np.unwrap(phase_data)
+            unwrap_out = mod.get_recorded_var("UNWRAP_PHASE_TEST_OUTPUT_1")
+            for i in range(len(phase_data)):
+                self.assertTrue(isclose(unwrap_out[i], np_unwrapped[i], rel_tol=1e-12, abs_tol=0.0))
+
+            del mod #Clean up singleton for next loop
+
+
+if __name__ == '__main__':
+    unittest.main()
+
+
+
+
+
+