meson: Add unit test framework

This commit also adds the first unit test. The unit test compares the
phonetic map generated by the Python and by the C implementation and
fails if the generated maps are different.

tests/test_phogen_map

@@ -0,0 +1,37 @@
+#!/bin/sh -ex
+#
+# Test Case:
+#
+# Use the Python and C implementations to produce the various tables. Compare
+# if the generated files are identical for both.
+#
+# Environment:
+#
+# PHOGEN_MAP_C - should point to the C executable
+# PHOGEN_MAP_PY - should point to the Python executable
+# PHOGEN_WORD_LIST - word list
+
+function on_exit()
+{
+    rm -v /tmp/phogen_*_$$.h
+    rm -v /tmp/phogen_*_$$.json
+    rm -v /tmp/phogen_*_$$.py
+}
+
+trap on_exit EXIT
+
+$PHOGEN_MAP_C \
+    --input "$PHOGEN_WORD_LIST" \
+    --clang "/tmp/phogen_c_$$.h" \
+    --python "/tmp/phogen_c_$$.py" \
+    --json "/tmp/phogen_c_$$.json"
+
+$PHOGEN_MAP_PY \
+    --input "$PHOGEN_WORD_LIST" \
+    --clang "/tmp/phogen_py_$$.h" \
+    --python "/tmp/phogen_py_$$.py" \
+    --json "/tmp/phogen_py_$$.json"
+
+cmp /tmp/phogen_c_$$.h /tmp/phogen_py_$$.h
+cmp /tmp/phogen_c_$$.py /tmp/phogen_py_$$.py
+cmp /tmp/phogen_c_$$.json /tmp/phogen_py_$$.json