Index: /trunk/psModules/test/detrend/tap_pmShutterCorrection.c
===================================================================
--- /trunk/psModules/test/detrend/tap_pmShutterCorrection.c	(revision 8919)
+++ /trunk/psModules/test/detrend/tap_pmShutterCorrection.c	(revision 8919)
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <string.h>
+#include <pslib.h>
+#include <psmodules.h>
+
+#include "tap.h"
+
+int main (void)
+{
+    plan_tests(143);
+
+    diag("pmShutterCorrection tests");
+
+    // test allocation, free of pmShutterCorrPars
+    {
+        psMemId id = psMemGetId();
+        pmShutterCorrPars *pars = pmShutterCorrParsAlloc ();
+
+        ok(pars != NULL, "pmShutterCorrPars successfully allocated");
+        skip_start(pars == NULL, 0, "Skipping tests because pmShutterCorrParsAlloc() failed");
+        skip_end();
+
+        psFree(pars);
+        ok(!psMemCheckLeaks (id, NULL, NULL, false), "no memory leaks");
+    }
+
+    // test parameter guess (linearly spaced exptimes)
+    {
+        psMemId id = psMemGetId();
+
+        int NPTS = 10;
+        float AK = 5.0;
+        float TK = 0.1;
+        float TO = 0.2;
+        psVector *exptime = psVectorAlloc (NPTS, PS_TYPE_F32);
+        psVector *counts  = psVectorAlloc (NPTS, PS_TYPE_F32);
+        exptime->n = counts->n = NPTS;
+
+        for (int i = 0; i < exptime->n; i++)
+        {
+            exptime->data.F32[i] = i;
+            counts->data.F32[i] = AK*(exptime->data.F32[i] + TK) / (exptime->data.F32[i] + TO);
+        }
+
+        pmShutterCorrPars *pars = pmShutterCorrectionGuess (exptime, counts);
+
+        ok(pars != NULL, "pmShutterCorrPars successfully allocated");
+        skip_start(pars == NULL, 0, "Skipping tests because pmShutterCorrParsAlloc() failed");
+        ok(pars->scale == AK, "got the right scale (got %f vs %f)", pars->scale, AK);
+        ok(pars->offset == TK, "got the right offset (got %f vs %f)", pars->offset, TK);
+        ok(pars->offref == TO, "got the right offref (got %f vs %f)", pars->offref, TO);
+        skip_end();
+
+        psFree(pars);
+        psFree(exptime);
+        psFree(counts);
+        ok(!psMemCheckLeaks (id, NULL, NULL, false), "no memory leaks");
+    }
+
+    return exit_status();
+}