diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
new file mode 100644
index 00000000..0535ba1a
--- /dev/null
+++ b/.github/workflows/test.yaml
@@ -0,0 +1,61 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+name: test
+
+on:
+  push:
+    branches: [ "unit-test" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build-matrix:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        toolchain:
+          - {compiler: gcc, version: 'latest', system: gfortran}
+        python-version: ["3.12"]
+    runs-on: ${{ matrix.os }}
+    container:
+      image: debian:12.11
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        shell: bash
+        run: |
+          apt-get update
+          apt-get install -y \
+            git \
+            wget \
+            gfortran \
+            cmake \
+            make \
+            libpng-dev \
+            libcairo2-dev \
+            libhdf5-dev \
+            libcfitsio-dev \
+            libx11-dev \
+            python3 \
+            python3-pip \
+            python3-venv 
+          git clone https://github.com/danieljprice/giza
+          make SYSTEM=gfortran withgiza
+          python3 -m pip install imagehash pytest numpy --break-system-packages
+
+      - name: Download data snapshots
+        shell: bash
+        run: |
+          mkdir -p test_data && cd test_data
+          wget -O 2i_00000 "https://zenodo.org/records/10052253/files/2i_00000?download=1"
+
+
+      - name: Run unit tests
+        run: |
+          export SPLASH_DIR=/__w/splash/splash/
+          export PATH=$PATH:$SPLASH_DIR/bin
+          export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$SPLASH_DIR/giza/lib
+          cd test_data
+          python3 $SPLASH_DIR/scripts/generate_renders_testing.py
+          pytest -v $SPLASH_DIR/tests/test_figure_hash.py
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index a59c5efc..5b7f317c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,5 +22,5 @@ Portfile*
 releasenotes*
 ChangeLog
 giza*
-tests
+tests/*f90
 __pycache__
diff --git a/data/config_files/render_testing.defaults b/data/config_files/render_testing.defaults
new file mode 100644
index 00000000..90390287
--- /dev/null
+++ b/data/config_files/render_testing.defaults
@@ -0,0 +1,812 @@
+&DATAOPTS
+ BUFFER_DATA=F,
+ ICALCQUANTITIES=F,
+ IRESCALE=T,
+ XORIGIN= 3*0.0000000000000000       ,
+ TRACK_STRING='           0        ',
+ IDUSTFRAC_PLOT=0          ,
+ IDELTAV_PLOT=0          ,
+ USEFAKEDUSTPARTICLES=F,
+ /
+&PLOTOPTS
+ IPLOTLINE=F,
+ LINESTYLE=1          ,
+ LINECOLOUR=1          ,
+ IMARKTYPE=1          ,4          ,17         ,1          ,3          ,
+  19*1          ,
+ IPLOTPARTOFTYPE=T,F,T, 21*F,
+ PLOTONRENDERINGS= 2*F,T, 21*F,
+ IEXACT=0          ,
+ ICOORDSNEW=1          ,
+ IFASTPARTICLEPLOT=T,
+ IDEFAULTCOLOURTYPE= 24*-1         ,
+ ITYPEORDER=1          ,2          ,3          ,4          ,5          ,
+ 6          ,7          ,8          ,9          ,10         ,11         ,
+ 12         ,13         ,14         ,15         ,16         ,17         ,
+ 18         ,19         ,20         ,21         ,22         ,23         ,
+ 24         ,
+ USETYPEINCONTOURS=T, 23*F,
+ IPLOTERRBARS=F,
+ ILOCERRBARS= 512*0          ,
+ HFACMARKERS=  1.0000000000000000     ,
+ ERRORBARTYPE=0          ,
+ ISMOOTH_PARTICLE_PLOTS=0          ,
+ RREF=  1.0000000000000000     ,
+ BETAFLARE=  1.2500000000000000     ,
+ MSTARI=  1.0000000000000000     ,
+ /
+&PAGEOPTS
+ IAXIS=0          ,
+ NACROSS=1          ,
+ NDOWN=1          ,
+ INTERACTIVE=T,
+ IADAPT=F,
+ IADAPTCOORDS=F,
+ NSTEPSPERPAGE=1          ,
+ ICOLOUREACHSTEP=T,
+ ICHANGESTYLES=F,
+ TILE=T,
+ IPAPERSIZE=0          ,
+ PAPERSIZEX=  0.0000000000000000     ,
+ ASPECTRATIO=  0.0000000000000000     ,
+ IPLOTLEGEND=T,
+ IPLOTSTEPLEGEND=F,
+ HPOSLEGEND= 0.94999999999999996     ,
+ VPOSLEGEND=  2.0000000000000000     ,
+ IPLOTTITLES=F,
+ HPOSTITLE= 0.50000000000000000     ,
+ VPOSTITLE=  1.0000000000000000     ,
+ FJUSTTITLE= 0.50000000000000000     ,
+ LEGENDTEXT='t=                                                                              ',
+ IPAGECOLOURS=0          ,
+ CHARHEIGHT=  1.0000000000000000     ,
+ LINEWIDTH=0          ,
+ FJUSTLEGEND=  1.0000000000000000     ,
+ IPLOTLEGENDONLYONPANEL=0          ,
+ IPLOTSCALE=F,
+ DXSCALE=  1.0000000000000000     ,
+ SCALETEXT='1 unit                                                                          ',
+ HPOSSCALE= 0.50000000000000000     ,
+ VPOSSCALE=  1.0000000000000000     ,
+ ISCALEPANEL=0          ,
+ IUSEBACKGROUNDCOLOURFORAXES=F,
+ USESQUAREXY=T,
+ MAXLINESTYLE=5          ,
+ MODLINESTYLE=1          ,
+ MAXCOLOUR=16         ,
+ MODCOLOUR=1          ,
+ USECOLUMNORDER=T,
+ IPAPERSIZEUNITS=1          ,
+ ADJUSTLIMITSTODEVICE=F,
+ ALPHALEGEND= 0.50000000000000000     ,
+ YSCALEALT=  1.0000000000000000     ,
+ LABELYALT='                                                                                ',
+ XMINOFFSET_TRACK= 3*0.50000000000000000      ,
+ XMAXOFFSET_TRACK= 3*0.50000000000000000      ,
+ XMINPAGEMARGIN=  0.0000000000000000     ,
+ XMAXPAGEMARGIN=  0.0000000000000000     ,
+ YMINPAGEMARGIN=  0.0000000000000000     ,
+ YMAXPAGEMARGIN=  0.0000000000000000     ,
+ LINEPALETTE=0          ,
+ /
+&RENDEROPTS
+ NPIX=0          ,
+ ICOLOURS=2          ,
+ NCONTOURS=30         ,
+ IPLOTCONT_NOMULTI=F,
+ ICOLOUR_PARTICLES=F,
+ COLOURBARDISP=  5.0000000000000000     ,
+ INORMALISE_INTERPOLATIONS=F,
+ IFASTRENDER=F,
+ IDENSITYWEIGHTEDINTERPOLATION=F,
+ ICOLOURBARSTYLE=1          ,
+ IPLOTCOLOURBARLABEL=T,
+ ILABELCONT=F,
+ PROJLABELFORMAT='                                                                                                    ',
+ IAPPLYPROJFORMAT=0          ,
+ DOUBLE_RENDERING=F,
+ IKERNEL=0          ,
+ COLOURBARPOSX= 0.75000000000000000     ,
+ COLOURBARPOSY= 0.69999999999999996     ,
+ COLOURBARLEN= 0.25000000000000000     ,
+ COLOURBARFMTSTR='BCMSTV    ',
+ COLOURBARWIDTH=  2.0000000000000000     ,
+ ICOLOURBARPOS=3          ,
+ RGBFILE='colours.ctb                                                                                                             ',
+ EXACT_RENDERING=F,
+ IAUTO_DENSITYWEIGHTED=T,
+ /
+&VECTOROPTS
+ NPIXVEC=40         ,
+ USEBACKGNDCOLORVECPLOT=F,
+ IPLOTPARTVEC=T,
+ IVECPLOTLEGEND=T,
+ HPOSLEGENDVEC=  2.0000000000000000E-002,
+ VPOSLEGENDVEC= -1.5000000000000000     ,
+ IPLOTSTREAMLINES=F,
+ IPLOTARROWHEADS=T,
+ IPLOTSYNCHROTRON=F,
+ RCRIT=  13.000000000000000     ,
+ ZCRIT=  2.5000000000000000     ,
+ SYNCHROTRONSPECINDEX= 0.80000000000000004     ,
+ UTHERMCUTOFF= -1.0000000000000000     ,
+ IHIDEARROWSWHERENOPARTS=F,
+ MINPARTFORARROW=1          ,
+ IALLARROWSSAMELENGTH=F,
+ IVECLEGENDONPANEL=0          ,
+ /
+&XSECROTOPTS
+ XSEC_NOMULTI=F,
+ XSECPOS_NOMULTI=  0.0000000000000000     ,
+ FLYTHRU=F,
+ XSECLINEX1=  0.0000000000000000     ,
+ XSECLINEX2=  0.0000000000000000     ,
+ XSECLINEY1=  0.0000000000000000     ,
+ XSECLINEY2=  0.0000000000000000     ,
+ IROTATE=F,
+ IROTATEAXES=0          ,
+ ANGLEX=  0.0000000000000000     ,
+ ANGLEY=  0.0000000000000000     ,
+ ANGLEZ=  0.0000000000000000     ,
+ XMINROTAXES= 3*0.0000000000000000       ,
+ XMAXROTAXES= 3*0.0000000000000000       ,
+ USE3DPERSPECTIVE=F,
+ USE3DOPACITYRENDERING=F,
+ ZOBSERVER=  0.0000000000000000     ,
+ DZSCREENFROMOBSERVER=  0.0000000000000000     ,
+ TAUPARTDEPTH= -1.0000000000000000     ,
+ XSECWIDTH=  0.0000000000000000     ,
+ RENDERSINKS=F,
+ /
+&POWERSPECOPTS
+ IPOWERSPECY=2          ,
+ IDISORDERED=T,
+ NWAVELENGTHS=128        ,
+ NFREQSPEC=1          ,
+ NPDFBINS=0          ,
+ FREQMIN=  1.0000000000000000     ,
+ FREQMAX=  128.00000000000000     ,
+ /
+&EXACTOPTS
+ IEXACTPLOTX= 32*0          ,
+ IEXACTPLOTY= 32*0          ,
+ FILENAME_EXACT= 32*'                                                                                                                        ',
+ MAXEXACTPTS=1001       ,
+ IEXACTLINECOLOUR= 32*1          ,
+ IEXACTLINESTYLE=1          ,2          ,3          ,4          ,5          ,
+ 0          ,1          ,2          ,3          ,4          ,5          ,
+ 0          ,1          ,2          ,3          ,4          ,5          ,
+ 0          ,1          ,2          ,3          ,4          ,5          ,
+ 0          ,1          ,2          ,3          ,4          ,5          ,
+ 0          ,1          ,2          ,
+ IAPPLYTRANSEXACTFILE=T,
+ ICALCULATEEXACTERRORS=T,
+ IPLOTRESIDUALS=F,
+ FRACINSETRESIDUALS= 0.14999999999999999     ,
+ RESIDUALMAX=  0.0000000000000000     ,
+ IPLOTEXACTONLYONPANEL=0          ,
+ IAPPLYUNITSEXACTFILE=F,
+ INORMALISEERRORS=1          ,
+ IPLOTEXACTUNDER=F,
+ EXACTALPHA=  1.0000000000000000     ,
+ /
+&EXACTPARAMS
+ AMPL=  5.0000000000000001E-003,
+ LAMBDA=  1.0000000000000000     ,
+ PERIOD=  1.0000000000000000     ,
+ IWAVEPLOTY=7          ,
+ IWAVEPLOTX=1          ,
+ XZERO=  0.0000000000000000     ,
+ HTSTAR=  1.0000000000000000     ,
+ ATSTAR=  1.0000000000000000     ,
+ CTSTAR=  1.0000000000000000     ,
+ ALPHATSTAR=  0.0000000000000000     ,
+ BETATSTAR=  0.0000000000000000     ,
+ CTSTAR1=  0.0000000000000000     ,
+ CTSTAR2=  0.0000000000000000     ,
+ POLYK=  1.0000000000000000     ,
+ SIGMA0=  0.0000000000000000     ,
+ NORDER=-1         ,
+ MORDER=0          ,
+ RHOSEDOV=  1.0000000000000000     ,
+ ESEDOV=  1.0000000000000000     ,
+ RHO_L=  1.0000000000000000     ,
+ RHO_R= 0.12500000000000000     ,
+ PR_L=  1.0000000000000000     ,
+ PR_R= 0.10000000000000001     ,
+ V_L=  0.0000000000000000     ,
+ V_R=  0.0000000000000000     ,
+ ISHK=1          ,
+ HFACT=  1.2000000000000000     ,
+ IPROFILE=1          ,
+ MSPHERE=  1.0000000000000000     ,  0.0000000000000000     ,
+ RSOFT=  1.0000000000000000     , 0.10000000000000001     ,
+ ICOLPOTEN=0          ,
+ ICOLFGRAV=0          ,
+ MSTAR=  1.0000000000000000     ,
+ RTORUS=  1.0000000000000000     ,
+ DISTORTION=  1.1000000000000001     ,
+ MRING=  1.0000000000000000     ,
+ RRING=  1.0000000000000000     ,
+ VISCNU=  1.0000000000000000E-003,
+ NFUNC=1          ,
+ FUNCSTRING= 32*'                                                                                                                        ',
+ CS=  1.0000000000000000     ,
+ KDRAG=  1.0000000000000000     ,
+ RHOZERO=  1.0000000000000000     ,
+ RDUST_TO_GAS=  0.0000000000000000     ,
+ MPRIM=  1.0000000000000000     ,
+ MSEC=  1.0000000000000000     ,
+ IMAPEXACT= 512*0          ,
+ IAUTO_MAP_COLUMNS=T,
+ XSHOCK=  0.0000000000000000     ,
+ TOTMASS=  1.0000000000000000     ,
+ MACHS=  50.000000000000000     ,
+ MACHA=  5.0000000000000000     ,
+ USE_SINK_DATA=T,
+ XPRIM= 3*0.0000000000000000       ,
+ XSEC=  1.0000000000000000     , 2*0.0000000000000000       ,
+ NFILES=1          ,
+ GAMMA_EXACT=  1.6666666666666667     ,
+ GAMMA2_EXACT=  1.0000000000000000     ,
+ USE_GAMMA_EXACT=F,
+ USE_GAMMA2_EXACT=F,
+ HONR=  5.0000000000000003E-002,
+ RPLANET=  1.0000000000000000     ,
+ Q_INDEX= 0.25000000000000000     ,
+ RELATIVISTIC=T,
+ GEODESIC_FLOW=F,
+ IS_WIND=T,
+ CONST1=  8.0000000000000000     ,
+ CONST2=  1.0000000000000000     ,
+ ISPIRAL=1          ,
+ NARMS=1          ,
+ SPIRAL_PARAMS=  0.0000000000000000     ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,
+   360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 6*0.0000000000000000       ,  360.00000000000000     , 5*0.0000000000000000       ,
+ 
+ PHASE=  0.0000000000000000     ,
+ IREAD_WAKEPARAMS=T,
+ ICLOCKWISE=F,
+ INONLIN=F,
+ /
+&MULTI
+ NYPLOTMULTI=4          ,
+ ITRANS= 5*0          ,1          , 3*0          ,1          , 502*0          ,
+ 
+ MULTIPLOTX= 512*1          ,
+ MULTIPLOTY=2          ,3          ,4          ,5          , 508*0          ,
+ 
+ IRENDERMULTI= 512*0          ,
+ IVECPLOTMULTI= 512*0          ,
+ ICONTOURMULTI= 512*0          ,
+ X_SECMULTI= 512*F,
+ XSECPOSMULTI= 512*0.0000000000000000       ,
+ IUSEALLTYPESMULTI= 512*T,
+ IPLOTPARTOFTYPEMULTI=T, 24*F,T, 24*F,T,
+  24*F,T, 24*F,T, 24*F,T,
+  24*F,T, 24*F,T, 24*F,T,
+  24*F,T, 24*F,T, 24*F,T,
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+  24*F,T, 24*F,T, 24*F,T,
+  24*F,T, 24*F,T, 24*F,T,
+  24*F,T, 24*F,T, 24*F,T,
+  11712*F,
+ /
+&SHAPEOPTS
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+ SHAPE(1)%ICOLOUR=1          ,
+ SHAPE(1)%LINESTYLE=1          ,
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+ /
+&CALCOPTS
+ CALCSTRING= 35*'                                                                                ',
+ CALCLABEL= 35*'                                                                                ',
+ CALCUNITSLABEL= 35*'                                        ',
+ /
+&ANIMOPTS
+ NSEQ=0          ,
+ NFRAMES=0          ,
+ ISEQSTART= 6*0          ,
+ ISEQEND= 6*0          ,
+ ISEQTYPE= 6*0          ,
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+ ICOLCHANGE=0          ,
+ XMINCOLEND=  0.0000000000000000     ,
+ XMAXCOLEND=  0.0000000000000000     ,
+ XSECPOS_NOMULTI_END=  0.0000000000000000     ,
+ /
+2i_00000
diff --git a/data/config_files/render_testing.limits b/data/config_files/render_testing.limits
new file mode 100644
index 00000000..d21aeda6
--- /dev/null
+++ b/data/config_files/render_testing.limits
@@ -0,0 +1,14 @@
+  -4.288563E+02   4.068461E+02
+  -2.816943E+02   2.827843E+02
+  -2.864435E+02   2.827554E+02
+   8.325490E-07   6.000302E-01
+   2.700926E-01   2.825931E+01
+   3.253349E+04   3.253349E+08
+  -1.054270E+00   1.258852E+00
+  -8.572277E+00   2.091594E+01
+  -1.400829E+00   2.515430E+00
+   2.476534E+10   2.476534E+14
+   0.000000E+00   0.000000E+00
+   0.000000E+00   5.949205E-01
+  -1.852214E-06   1.898078E-06
+  -2.984610E+40   0.000000E+00
diff --git a/data/config_files/render_testing.units b/data/config_files/render_testing.units
new file mode 100644
index 00000000..b563322a
--- /dev/null
+++ b/data/config_files/render_testing.units
@@ -0,0 +1,15 @@
+  0.44269732330565637      ; hrs ;   69595000000.000000      ; [cm]
+  0.99992816091954018      ; [R_{Sun}]
+  0.99992816091954018      ; [R_{Sun}]
+  0.99992816091954018      ; [R_{Sun}]
+   1.0000502765208648      ; [M_{Sun}]
+  0.99992816091954018      ; [R_{Sun}]
+   5.9009576780619177      ; [g/cm^3]
+   436.68537004225072      ; [km/s]
+   436.68537004225072      ; [km/s]
+   436.68537004225072      ; [km/s]
+   1906941124089374.8      ; [erg/g]
+   1.0000000000000000      ;
+   1.0000000000000000      ;
+   6.2746658530390216E-004 ; [1/s]
+   3.7930965899261752E+048 ; [erg]
diff --git a/data/control_images/bad_plot.png b/data/control_images/bad_plot.png
new file mode 100644
index 00000000..f1f49cc0
Binary files /dev/null and b/data/control_images/bad_plot.png differ
diff --git a/data/control_images/log_rho_render.png b/data/control_images/log_rho_render.png
new file mode 100644
index 00000000..1d934cff
Binary files /dev/null and b/data/control_images/log_rho_render.png differ
diff --git a/data/control_images/log_rho_sink0_render.png b/data/control_images/log_rho_sink0_render.png
new file mode 100644
index 00000000..1d934cff
Binary files /dev/null and b/data/control_images/log_rho_sink0_render.png differ
diff --git a/data/control_images/log_rho_sink1_render.png b/data/control_images/log_rho_sink1_render.png
new file mode 100644
index 00000000..a7daeb7c
Binary files /dev/null and b/data/control_images/log_rho_sink1_render.png differ
diff --git a/data/control_images/log_rho_sink1_render_splash4_19march.png b/data/control_images/log_rho_sink1_render_splash4_19march.png
new file mode 100644
index 00000000..784e1251
Binary files /dev/null and b/data/control_images/log_rho_sink1_render_splash4_19march.png differ
diff --git a/data/control_images/log_rho_sink1_render_splash4_312.png b/data/control_images/log_rho_sink1_render_splash4_312.png
new file mode 100644
index 00000000..a7daeb7c
Binary files /dev/null and b/data/control_images/log_rho_sink1_render_splash4_312.png differ
diff --git a/data/control_images/log_rho_sink2_render.png b/data/control_images/log_rho_sink2_render.png
new file mode 100644
index 00000000..af0873b9
Binary files /dev/null and b/data/control_images/log_rho_sink2_render.png differ
diff --git a/data/control_images/log_rho_v_render.png b/data/control_images/log_rho_v_render.png
new file mode 100644
index 00000000..be879440
Binary files /dev/null and b/data/control_images/log_rho_v_render.png differ
diff --git a/data/control_images/log_u_render.png b/data/control_images/log_u_render.png
new file mode 100644
index 00000000..04c53c3e
Binary files /dev/null and b/data/control_images/log_u_render.png differ
diff --git a/scripts/Dockerfile b/scripts/Dockerfile
new file mode 100644
index 00000000..c9d42b1d
--- /dev/null
+++ b/scripts/Dockerfile
@@ -0,0 +1,29 @@
+FROM debian:12.11
+
+RUN apt-get update && apt-get install -y \
+    python3 \
+    python3-pip \
+    gfortran \
+    git \
+    make \
+    cmake \
+    libpng-dev \
+    libx11-dev \
+    libcairo2-dev \
+    pkg-config \
+    vim \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /opt/splash
+RUN git clone https://github.com/danieljprice/splash.git . && \
+    git clone https://github.com/danieljprice/giza.git giza && \
+    git checkout v3.12.0 && \
+    make SYSTEM=gfortran withgiza
+
+ENV PATH="/opt/splash/bin:$PATH"
+ENV LD_LIBRARY_PATH="/opt/splash/giza/lib:$LD_LIBRARY_PATH"
+
+RUN pip install pillow "imagehash>=4.3.2" "numpy<2.0" \
+    --break-system-packages
+
+WORKDIR /workspace
\ No newline at end of file
diff --git a/scripts/generate_renders_testing.py b/scripts/generate_renders_testing.py
new file mode 100644
index 00000000..cef76268
--- /dev/null
+++ b/scripts/generate_renders_testing.py
@@ -0,0 +1,13 @@
+import subprocess
+
+RENDERS = [
+    ["splash", "2i_00000", "-r", "6",  "-p", "render_testing",                    "-dev", "log_rho_render.png"  ],
+    ["splash", "2i_00000", "-r", "10", "-p", "render_testing",                    "-dev", "log_u_render.png"    ],
+    ["splash", "2i_00000", "-r", "6",  "-p", "render_testing", "-vec", "7",       "-dev", "log_rho_v_render.png"],
+    ["splash", "2i_00000", "-r", "6",  "-p", "render_testing", "--sink=0",        "-dev", "log_rho_sink0_render.png"],
+    ["splash", "2i_00000", "-r", "6",  "-p", "render_testing", "--sink=1",        "-dev", "log_rho_sink1_render.png"],
+    ["splash", "2i_00000", "-r", "6",  "-p", "render_testing", "--sink=2",        "-dev", "log_rho_sink2_render.png"],
+]
+
+for command in RENDERS:
+    subprocess.run(command, check=True)
\ No newline at end of file
diff --git a/tests/test_figure_hash.py b/tests/test_figure_hash.py
new file mode 100644
index 00000000..76562efc
--- /dev/null
+++ b/tests/test_figure_hash.py
@@ -0,0 +1,56 @@
+from PIL import Image
+import imagehash
+from pathlib import Path
+import os
+import pytest
+from enum import IntEnum
+import numpy as np
+
+class Threshold(IntEnum):
+    HIGH     =  4  # Nearly identical, tight tolerance
+    MEDIUM   =  7  # Minor platform differences expected
+    LOW      = 10  # Moderate differences acceptable
+    RELAXED  = 15  # Known sensitivity to platform/version differences
+
+
+SPLASH_DIR  = Path(os.environ.get("SPLASH_DIR", Path(__file__).resolve().parents[1]))
+TARGET_DIR  = Path("./")
+CONTROL_DIR = SPLASH_DIR / "data/control_images"
+BAD_PLOT    = CONTROL_DIR / "bad_plot.png"
+
+
+
+def hamming(img1, img2):
+    h1 = imagehash.phash(img1).hash
+    h2 = imagehash.phash(img2).hash
+    return int(np.count_nonzero(h1 != h2))
+
+
+@pytest.fixture
+def image_pair():
+    def _load(image_name):
+        control = Image.open(CONTROL_DIR / image_name)
+        target  = Image.open(TARGET_DIR  / image_name)
+        return control, target
+    return _load
+
+
+class TestImageHash:
+
+    @pytest.mark.parametrize(
+        "image_name, threshold",
+        [
+            ("log_rho_render.png", Threshold.LOW),
+            ("log_rho_sink0_render.png", Threshold.LOW),
+            ("log_rho_sink1_render.png", Threshold.RELAXED),
+            ("log_rho_sink2_render.png", Threshold.RELAXED),
+            ("log_rho_v_render.png", Threshold.LOW),
+            ("log_u_render.png", Threshold.LOW),
+        ]
+    )
+    def test_renders(self, image_name, threshold, image_pair):
+        target_path = TARGET_DIR / image_name
+        assert target_path.exists()
+        control, target = image_pair(image_name)
+        assert hamming(control, target) <= threshold
+        assert hamming(Image.open(BAD_PLOT), target) > Threshold.LOW
\ No newline at end of file