diff --git a/Makefile b/Makefile
index 780303a..1a52d6c 100644
--- a/Makefile
+++ b/Makefile
@@ -4,13 +4,24 @@ HFILES := $(shell find include -type f -name '*.h')
 CFILES := $(shell find src -type f -name '*.c')
 OFILES := $(CFILES:%.c=%.o)
 
-.PHONY: clean
+TESTFILES := $(shell find test -type f -name '*.c' -not -name runner.c)
+TESTS := $(TESTFILES:%.c=%)
+
+.PHONY: clean test
 
 psxc: $(OFILES)
 	$(CC) $(OFILES) -o $@
 
+test/%: test/%.c $(HFILES) $(OFILES)
+	$(CC) -Wno-unused-parameter $(CFLAGS) $(filter-out src/main.o, $(OFILES)) test/runner.c $< -o $@
+
 %.o: %.c $(HFILES)
 	$(CC) $(CFLAGS) -c $< -o $@
 
 clean:
-	rm -f $(OFILES) psxc
+	rm -f $(OFILES) $(TESTS) psxc
+
+test: $(TESTS)
+	@for TEST in $(TESTS); do \
+		./$$TEST; \
+	done
diff --git a/include/util.h b/include/util.h
index 11061bb..a6f2a7b 100644
--- a/include/util.h
+++ b/include/util.h
@@ -1,6 +1,16 @@
 #ifndef PSXC_UTIL_H_
 #define PSXC_UTIL_H_
 
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct {
+  size_t size;
+  uint8_t data[];
+} byte_arr_t;
+
 void fatal(const char *fmt, ...);
 
+byte_arr_t *read_file(const char *filepath);
+
 #endif
diff --git a/src/util.c b/src/util.c
index 59c0b3e..ccffa03 100644
--- a/src/util.c
+++ b/src/util.c
@@ -13,3 +13,28 @@ void fatal(const char *fmt, ...) {
 
   exit(EXIT_FAILURE);
 }
+
+byte_arr_t *read_file(const char *filepath) {
+  FILE *fp = fopen(filepath, "rb");
+  byte_arr_t *arr = NULL;
+
+  fseek(fp, 0, SEEK_END);
+  const long size = ftell(fp);
+  if (size < 0) {
+    goto end;
+  }
+
+  arr = malloc(sizeof *arr + size);
+  if (arr == NULL) {
+    goto end;
+  }
+
+  arr->size = size;
+
+  rewind(fp);
+  fread(arr->data, 1, size, fp);
+
+end:
+  fclose(fp);
+  return arr;
+}
diff --git a/test/.gitignore b/test/.gitignore
new file mode 100644
index 0000000..f903718
--- /dev/null
+++ b/test/.gitignore
@@ -0,0 +1,3 @@
+!runner.c
+test_*
+!test_*.c
diff --git a/test/runner.c b/test/runner.c
new file mode 100644
index 0000000..58df0c9
--- /dev/null
+++ b/test/runner.c
@@ -0,0 +1,13 @@
+#include "test.h"
+
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+  printf("%s:\n", argv[0]);
+  for (size_t i = 0; i < NUM_TEST_CASES; ++i) {
+    printf("  * %s: ", TEST_CASES[i].name);
+    TEST_CASES[i].test();
+    printf("OK!\n");
+  }
+  return 0;
+}
diff --git a/test/test.h b/test/test.h
new file mode 100644
index 0000000..86ea6ff
--- /dev/null
+++ b/test/test.h
@@ -0,0 +1,15 @@
+#ifndef PSXC_TEST_H_
+#define PSXC_TEST_H_
+
+#include <stddef.h>
+
+typedef struct {
+  const char *name;
+  void (*test)(void);
+} test_case_t;
+
+extern const test_case_t TEST_CASES[];
+
+extern const size_t NUM_TEST_CASES;
+
+#endif
diff --git a/test/test_util.c b/test/test_util.c
new file mode 100644
index 0000000..d298dbd
--- /dev/null
+++ b/test/test_util.c
@@ -0,0 +1,36 @@
+#include "test.h"
+#include "util.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define ARR_SIZE 50
+
+void test_read_file(void) {
+  const char *filepath = tmpnam(NULL);
+
+  uint8_t arr[ARR_SIZE] = {0};
+  for (size_t i = 0; i < sizeof arr; ++i) {
+    arr[i] = rand() % 256;
+  }
+
+  FILE *fp = fopen(filepath, "wb");
+  assert(fp != NULL);
+
+  fwrite(&arr[0], 1, ARR_SIZE, fp);
+  fclose(fp);
+
+  byte_arr_t *barr = read_file(filepath);
+  assert(barr != NULL);
+  assert(barr->size == ARR_SIZE);
+
+  assert(memcmp(&arr[0], barr->data, ARR_SIZE) == 0);
+}
+
+const test_case_t TEST_CASES[] = {
+    {"can read simple file", test_read_file},
+};
+
+const size_t NUM_TEST_CASES = sizeof TEST_CASES / sizeof TEST_CASES[0];
\ No newline at end of file