diff --git a/tests/.gitignore b/tests/.gitignore
index 8ac0ced..16e760f 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -1,2 +1,3 @@
 *.observed
+*.observed.filtered
 *.wasm
diff --git a/tests/general/abort.c b/tests/general/abort.c
new file mode 100644
index 0000000..ddac207
--- /dev/null
+++ b/tests/general/abort.c
@@ -0,0 +1,6 @@
+#include <stdlib.h>
+
+int main(void) {
+    abort();
+    return 0;
+}
diff --git a/tests/general/abort.c.exit_status.expected b/tests/general/abort.c.exit_status.expected
new file mode 100644
index 0000000..405e2af
--- /dev/null
+++ b/tests/general/abort.c.exit_status.expected
@@ -0,0 +1 @@
+134
diff --git a/tests/general/abort.c.stderr.expected b/tests/general/abort.c.stderr.expected
new file mode 100644
index 0000000..dbcd5f3
--- /dev/null
+++ b/tests/general/abort.c.stderr.expected
@@ -0,0 +1,6 @@
+Error: failed to run main module `abort.c.---.wasm`
+
+Caused by:
+    0: failed to invoke `_start`
+    1: wasm trap: unreachable, source location: @----
+       wasm backtrace:
diff --git a/tests/general/abort.c.stderr.expected.filter b/tests/general/abort.c.stderr.expected.filter
new file mode 100755
index 0000000..b9f9c66
--- /dev/null
+++ b/tests/general/abort.c.stderr.expected.filter
@@ -0,0 +1,7 @@
+#!/bin/bash
+set -euo pipefail
+
+cat \
+    | sed -e 's/main module `abort\.c\.[^`]*\.wasm`/main module `abort.c.---.wasm`/' \
+    | sed -e 's/source location: @[[:xdigit:]]*$/source location: @----/' \
+    | head -n 6
diff --git a/tests/general/assert-fail.c b/tests/general/assert-fail.c
new file mode 100644
index 0000000..07f4557
--- /dev/null
+++ b/tests/general/assert-fail.c
@@ -0,0 +1,7 @@
+#include <assert.h>
+#include <stdbool.h>
+
+int main(void) {
+    assert(false);
+    return 0;
+}
diff --git a/tests/general/assert-fail.c.exit_status.expected b/tests/general/assert-fail.c.exit_status.expected
new file mode 100644
index 0000000..405e2af
--- /dev/null
+++ b/tests/general/assert-fail.c.exit_status.expected
@@ -0,0 +1 @@
+134
diff --git a/tests/general/assert-fail.c.stderr.expected b/tests/general/assert-fail.c.stderr.expected
new file mode 100644
index 0000000..db6da54
--- /dev/null
+++ b/tests/general/assert-fail.c.stderr.expected
@@ -0,0 +1,7 @@
+Assertion failed: false (assert-fail.c: main: 5)
+Error: failed to run main module `assert-fail.c.---.wasm`
+
+Caused by:
+    0: failed to invoke `_start`
+    1: wasm trap: unreachable, source location: @----
+       wasm backtrace:
diff --git a/tests/general/assert-fail.c.stderr.expected.filter b/tests/general/assert-fail.c.stderr.expected.filter
new file mode 100755
index 0000000..df075b1
--- /dev/null
+++ b/tests/general/assert-fail.c.stderr.expected.filter
@@ -0,0 +1,7 @@
+#!/bin/bash
+set -euo pipefail
+
+cat \
+    | sed -e 's/main module `assert-fail\.c\.[^`]*\.wasm`/main module `assert-fail.c.---.wasm`/' \
+    | sed -e 's/source location: @[[:xdigit:]]*$/source location: @----/' \
+    | head -n 7
diff --git a/tests/general/assert-pass.c b/tests/general/assert-pass.c
new file mode 100644
index 0000000..e57329f
--- /dev/null
+++ b/tests/general/assert-pass.c
@@ -0,0 +1,7 @@
+#include <assert.h>
+#include <stdbool.h>
+
+int main(void) {
+    assert(true);
+    return 0;
+}
diff --git a/tests/general/environ.c b/tests/general/environ.c
new file mode 100644
index 0000000..14dc955
--- /dev/null
+++ b/tests/general/environ.c
@@ -0,0 +1,18 @@
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+extern char **environ;
+
+int main(void) {
+    assert(environ != NULL);
+    for (char **p = environ; *p; ++p) {
+        assert(p != NULL);
+    }
+    for (char **p = environ; *p; ++p) {
+        if (strncmp(*p, "HELLO=", 5) == 0) {
+            printf("HELLO = %s\n", *p + 6);
+        }
+    }
+    return 0;
+}
diff --git a/tests/general/environ.c.env b/tests/general/environ.c.env
new file mode 100644
index 0000000..9be21df
--- /dev/null
+++ b/tests/general/environ.c.env
@@ -0,0 +1 @@
+HELLO=hello
diff --git a/tests/general/environ.c.stdout.expected b/tests/general/environ.c.stdout.expected
new file mode 100644
index 0000000..b9a2a66
--- /dev/null
+++ b/tests/general/environ.c.stdout.expected
@@ -0,0 +1 @@
+HELLO = hello
diff --git a/tests/testcase.sh b/tests/testcase.sh
index d2da956..e072243 100755
--- a/tests/testcase.sh
+++ b/tests/testcase.sh
@@ -60,11 +60,27 @@ echo $exit_status > "$exit_status_observed"
 # Determine the reference files to compare with.
 if [ -e "$input.stdout.expected" ]; then
   stdout_expected="$input.stdout.expected"
+
+  # Apply output filters.
+  if [ -e "$input.stdout.expected.filter" ]; then
+      cat "$stdout_observed" \
+          | "$input.stdout.expected.filter" \
+          > "${stdout_observed}.filtered"
+      stdout_observed="${stdout_observed}.filtered"
+  fi
 else
   stdout_expected="/dev/null"
 fi
 if [ -e "$input.stderr.expected" ]; then
   stderr_expected="$input.stderr.expected"
+
+  # Apply output filters.
+  if [ -e "$input.stderr.expected.filter" ]; then
+      cat "$stderr_observed" \
+          | "./$input.stderr.expected.filter" \
+          > "${stderr_observed}.filtered"
+      stderr_observed="${stderr_observed}.filtered"
+  fi
 else
   stderr_expected="/dev/null"
 fi