[PATCH olang 2/2] tests: add unit tests configuration

[Carlos Maniero <carlos@maniero.me>]

This commit introduces a basic configuration for unit tests. However, as
there are currently no unit tests, the linter step has not been
activated. This is because clang-format does not handle zero files
gracefully.

The linter step must be enabled once the first unit test is implemented.

Signed-off-by: Carlos Maniero <carlos@maniero.me>
---
 Makefile            |  6 +++++-
 tests/unit/Makefile | 28 ++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 tests/unit/Makefile

diff --git a/Makefile b/Makefile
index b13b41b..62297ad 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,6 @@ linter: $(SRCS) $(HEADERS)
 	clang-format --dry-run --Werror $?
 	$(MAKE) -C tests/integration/ linter
 
-
 .PHONY: linter-fix
 linter-fix: $(SRCS) $(HEADERS)
 	clang-format -i $?
@@ -32,9 +31,14 @@ integration-test:
 	$(MAKE)
 	$(MAKE) -C tests/integration/
 
+.PHONY: unit-test
+unit-test:
+	$(MAKE) -C tests/unit/
+
 .PHONY: check
 check:
 	$(MAKE) integration-test
+	$(MAKE) unit-test
 
 $(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
 	$(CC) $(CFLAGS) -c $< -o $@
diff --git a/tests/unit/Makefile b/tests/unit/Makefile
new file mode 100644
index 0000000..ab250cf
--- /dev/null
+++ b/tests/unit/Makefile
@@ -0,0 +1,28 @@
+SRCS        := $(wildcard *_test.c)
+OBJS        := $(patsubst %_test.c, %_test.o, $(SRCS))
+CFLAGS      := -I../../src -I../shared
+TESTS       := $(patsubst %_test.c, %_test, $(SRCS))
+EXEC_TESTS  := $(patsubst %_test, ./%_test, $(TESTS))
+MUNIT_SRC   := ../shared/munit.c
+MUNIT       := ./munit.o
+
+.PHONY: all
+all: $(MUNIT) $(TESTS)
+	@for file in $(EXEC_TESTS); do \
+                ./"$$file"; \
+        done
+
+.PHONY: clean
+clean:
+	$(RM) *.o *_test
+
+.PHONY: linter
+linter: $(SRCS)
+	clang-format --dry-run --Werror $?
+
+.PHONY: linter-fix
+linter-fix: $(SRCS)
+	clang-format -i $?
+
+$(MUNIT):
+	$(CC) -c $(MUNIT_SRC) $(CFLAGS) -o $(MUNIT)
-- 
2.34.1