diff --git a/src/test/java/org/example/StringifyFileContentsTest.java b/src/test/java/org/example/StringifyFileContentsTest.java
new file mode 100644
index 0000000..c555642
--- /dev/null
+++ b/src/test/java/org/example/StringifyFileContentsTest.java
@@ -0,0 +1,35 @@
+package org.example;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+public class StringifyFileContentsTest {
+
+  @Test
+  @Tag("unit")
+  void testValidFile() {
+    Path fp = Paths.get("src/test/resources");
+    String stringFromFile = StringifyFileContents.toString("a-text-file.txt", fp);
+    assertEquals(stringFromFile, "The quick brown fox jumps over the lazy dog");
+  }
+
+  @Test
+  @Tag("unit")
+  void testInvalidPath() {
+    Path fp = Paths.get("src/test/reso");
+    String stringFromFile = StringifyFileContents.toString("a-text-file.txt", fp);
+    assertEquals(stringFromFile, "\nAn error reading file occured :c");
+  }
+
+  @Test
+  @Tag("unit")
+  void testInvalidFileName() {
+    Path fp = Paths.get("src/test/resources");
+    String stringFromFile = StringifyFileContents.toString("non-existent-text-file.txt", fp);
+    assertEquals(stringFromFile, "\nAn error reading file occured :c");
+  }
+}
diff --git a/src/test/java/org/example/TokensTest.java b/src/test/java/org/example/TokensTest.java
new file mode 100644
index 0000000..7bbacae
--- /dev/null
+++ b/src/test/java/org/example/TokensTest.java
@@ -0,0 +1,48 @@
+package org.example;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.json.JSONObject;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+public class TokensTest {
+
+  @Test
+  @Tag("unit")
+  void testValidJSON() {
+    JSONObject meta =
+        new JSONObject(
+            "{ `tokens`: { `input_tokens`: 69, `output_tokens`: 420 } }".replace('`', '"'));
+    Tokens tokens = Tokens.fromJson(meta);
+    assertEquals(tokens.getInputTokens(), 69);
+    assertEquals(tokens.getOutputTokens(), 420);
+  }
+
+  @Test
+  @Tag("unit")
+  void testJSONMissingTokens() {
+    JSONObject meta = new JSONObject("{}");
+    Tokens tokens = Tokens.fromJson(meta);
+    assertEquals(tokens.getInputTokens(), 0);
+    assertEquals(tokens.getOutputTokens(), 0);
+  }
+
+  @Test
+  @Tag("unit")
+  void testJSONMissingInputTokens() {
+    JSONObject meta = new JSONObject("{ `tokens`: { `output_tokens`: 420 } }".replace('`', '"'));
+    Tokens tokens = Tokens.fromJson(meta);
+    assertEquals(tokens.getInputTokens(), 0);
+    assertEquals(tokens.getOutputTokens(), 420);
+  }
+
+  @Test
+  @Tag("unit")
+  void testJSONMissingOutputTokens() {
+    JSONObject meta = new JSONObject("{ `tokens`: { `input_tokens`: 69 } }".replace('`', '"'));
+    Tokens tokens = Tokens.fromJson(meta);
+    assertEquals(tokens.getInputTokens(), 69);
+    assertEquals(tokens.getOutputTokens(), 0);
+  }
+}
diff --git a/src/test/resources/a-text-file.txt b/src/test/resources/a-text-file.txt
new file mode 100644
index 0000000..ff3bb63
--- /dev/null
+++ b/src/test/resources/a-text-file.txt
@@ -0,0 +1 @@
+The quick brown fox jumps over the lazy dog
\ No newline at end of file