Use test-runner.sh instead of homegrown test.sh

Makefile

@@ -1,12 +1,38 @@
-test: prepare
-	./test.sh
+test: bootstrap
+	./test-runner.sh
 
-prepare:
-	test -f "test/assert.sh" || ( \
+bootstrap: test-runner.sh test/assert.sh
+
+clean: remove-test-runner.sh remove-assert.sh
+
+test/assert.sh:
+	test -f "test/assert.sh" || \
 		echo "fetching assert.sh..." && \
 		curl -s -L -o test/assert.sh \
-			https://raw.github.com/lehmannro/assert.sh/v1.0.2/assert.sh \
-	)
+			https://raw.github.com/lehmannro/assert.sh/v1.0.2/assert.sh
+
+update-assert.sh: remove-assert.sh test/assert.sh
+
+remove-assert.sh:
+	( \
+		test -f "test/assert.sh" && rm "test/assert.sh" && \
+		echo "removed test/assert.sh"\
+	) || exit 0
+
+test-runner.sh:
+	test -f "test-runner.sh" || \
+		echo "fetching test-runner.sh..." && \
+		curl -s -L -o test-runner.sh \
+			https://github.com/jimeh/test-runner.sh/raw/v0.1.0/test-runner.sh && \
+		chmod +x test-runner.sh
+
+remove-test-runner.sh:
+	( \
+		test -f "test-runner.sh" && rm "test-runner.sh" && \
+		echo "removed test-runner.sh"\
+	) || exit 0
+
+update-test-runner.sh: remove-test-runner.sh test-runner.sh
 
 .SILENT:
-.PHONY: test prepare
+.PHONY: test bootstrap