diff --git a/substitute.mk b/substitute.mk
index 2e28e5867..9e3123a14 100644
--- a/substitute.mk
+++ b/substitute.mk
@@ -17,6 +17,9 @@
 	 -e "s^@coreutils\@^$(coreutils)^g" \
 	 -e "s^@tar\@^$(tar)^g" \
 	 -e "s^@dot\@^$(dot)^g" \
+	 -e "s^@xmllint\@^$(xmllint)^g" \
+	 -e "s^@xmlflags\@^$(xmlflags)^g" \
+	 -e "s^@xsltproc\@^$(xsltproc)^g" \
 	 -e "s^@aterm_bin\@^$(aterm_bin)^g" \
 	 -e "s^@version\@^$(VERSION)^g" \
 	 < $< > $@ || rm $@
diff --git a/tests/Makefile.am b/tests/Makefile.am
index dc753e781..540665ea9 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -3,22 +3,20 @@ TESTS_ENVIRONMENT = $(SHELL) -e
 extra1 = $(shell pwd)/test-tmp/shared
 
 simple.sh: simple.nix
-dependencies.sh: dependencies.nix
+dependencies.sh gc.sh nix-push.sh nix-pull.in logging.sh: dependencies.nix
 locking.sh: locking.nix
 parallel.sh: parallel.nix
 build-hook.sh: build-hook.nix
 substitutes.sh: substitutes.nix
 substitutes2.sh: substitutes2.nix
 fallback.sh: fallback.nix
-nix-push.sh: dependencies.nix
-nix-pull.sh: dependencies.nix
-gc.sh: dependencies.nix
 gc-concurrent.sh: gc-concurrent.nix gc-concurrent2.nix
 user-envs.sh: user-envs.nix
 
 TESTS = init.sh hash.sh lang.sh simple.sh dependencies.sh locking.sh parallel.sh \
   build-hook.sh substitutes.sh substitutes2.sh fallback.sh nix-push.sh gc.sh \
-  gc-concurrent.sh verify.sh nix-pull.sh referrers.sh user-envs.sh misc.sh
+  gc-concurrent.sh verify.sh nix-pull.sh referrers.sh user-envs.sh \
+  logging.sh misc.sh
 
 XFAIL_TESTS =
 
diff --git a/tests/common.sh.in b/tests/common.sh.in
index ca5ef5ecc..cd0ebf2cf 100644
--- a/tests/common.sh.in
+++ b/tests/common.sh.in
@@ -22,6 +22,8 @@ export PERL=perl
 export TOP=$(pwd)/..
 export aterm_bin=@aterm_bin@
 export dot=@dot@
+export xmllint="@xmllint@ @xmlflags@"
+export xsltproc="@xsltproc@"
 
 export version=@version@
 
diff --git a/tests/dependencies.sh b/tests/dependencies.sh
index cc912f8ef..434027e46 100644
--- a/tests/dependencies.sh
+++ b/tests/dependencies.sh
@@ -4,7 +4,7 @@ drvPath=$($nixinstantiate dependencies.nix)
 
 echo "derivation is $drvPath"
 
-$TOP/src/nix-store/nix-store -q --tree "$drvPath" | grep '   +---.*builder1.sh'
+$nixstore -q --tree "$drvPath" | grep '   +---.*builder1.sh'
 
 # Test Graphviz graph generation.
 $nixstore -q --graph "$drvPath" > $TEST_ROOT/graph
diff --git a/tests/gc-concurrent.sh b/tests/gc-concurrent.sh
index 5004a6e4e..446e79f13 100644
--- a/tests/gc-concurrent.sh
+++ b/tests/gc-concurrent.sh
@@ -6,7 +6,8 @@ outPath1=$($nixstore -q $drvPath1)
 drvPath2=$($nixinstantiate gc-concurrent2.nix)
 outPath2=$($nixstore -q $drvPath2)
 
-ln -s $drvPath2 "$NIX_STATE_DIR"/gcroots/foo2
+rm -f "$NIX_STATE_DIR"/gcroots/foo
+ln -s $drvPath2 "$NIX_STATE_DIR"/gcroots/foo
 
 # Start build #1 in the background.  It starts immediately.
 $nixstore -rvv "$drvPath1" &
@@ -35,3 +36,5 @@ cat $outPath1/input-2/bar
 
 # Build #2 should have failed because its derivation got garbage collected.
 cat $outPath2/foobar
+
+rm "$NIX_STATE_DIR"/gcroots/foo
diff --git a/tests/gc.sh b/tests/gc.sh
index afbda953e..36b09593d 100644
--- a/tests/gc.sh
+++ b/tests/gc.sh
@@ -4,7 +4,8 @@ drvPath=$($nixinstantiate dependencies.nix)
 outPath=$($nixstore -rvv "$drvPath")
 
 # Set a GC root.
-ln -s $outPath "$NIX_STATE_DIR"/gcroots/foo
+rm -f "$NIX_STATE_DIR"/gcroots/foo
+ln -sf $outPath "$NIX_STATE_DIR"/gcroots/foo
 
 $NIX_BIN_DIR/nix-collect-garbage
 
@@ -14,3 +15,5 @@ cat $outPath/input-2/bar
 
 # Check that the derivation has been GC'd.
 if cat $drvPath > /dev/null; then false; fi
+
+rm "$NIX_STATE_DIR"/gcroots/foo
diff --git a/tests/logging.sh b/tests/logging.sh
new file mode 100644
index 000000000..096c743fd
--- /dev/null
+++ b/tests/logging.sh
@@ -0,0 +1,24 @@
+source common.sh
+
+rm -f $NIX_STATE_DIR/var/nix/
+$nixstore --gc
+
+# Produce an escaped log file.
+$nixstore --log-type escapes -r -vv $($nixinstantiate dependencies.nix) 2> $TEST_ROOT/log.esc
+
+# Convert it to an XML representation.
+$TOP/src/nix-log2xml/nix-log2xml < $TEST_ROOT/log.esc > $TEST_ROOT/log.xml
+
+# Is this well-formed XML?
+if test -n "$xmllint"; then
+    $xmllint --noout $TEST_ROOT/log.xml
+fi
+
+# Convert to HTML.
+if test -n "$xsltproc"; then
+    (cd $TOP/src/nix-log2xml && $xsltproc mark-errors.xsl - | $xsltproc log2html.xsl -) < $TEST_ROOT/log.xml > $TEST_ROOT/log.html
+    # Ideally we would check that the generated HTML is valid...
+
+    # A few checks...
+    grep "<li>.*<code>.*echo FOO" $TEST_ROOT/log.html
+fi