diff --git a/tests/testsuite/package.rs b/tests/testsuite/package.rs
index 3e7b5b7153ff..3640ea798c03 100644
--- a/tests/testsuite/package.rs
+++ b/tests/testsuite/package.rs
@@ -2469,3 +2469,191 @@ version = "0.1.0"
         &[("Cargo.toml", &rewritten_toml)],
     );
 }
+
+#[cargo_test]
+fn basic_filesizes() {
+    let cargo_toml_orig_contents = r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+                exclude = ["*.txt"]
+                license = "MIT"
+                description = "foo"
+            "#;
+    let main_rs_contents = r#"fn main() { println!("🦀"); }"#;
+    let cargo_toml_contents = format!(
+        r#"{}
+[package]
+name = "foo"
+version = "0.0.1"
+authors = []
+exclude = ["*.txt"]
+description = "foo"
+license = "MIT"
+"#,
+        cargo::core::package::MANIFEST_PREAMBLE
+    );
+    let cargo_lock_contents = r#"# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "foo"
+version = "0.0.1"
+"#;
+    let p = project()
+        .file("Cargo.toml", cargo_toml_orig_contents)
+        .file("src/main.rs", main_rs_contents)
+        .file("src/bar.txt", "Ignored text file contents") // should be ignored when packaging
+        .build();
+
+    let uncompressed_size = cargo_toml_orig_contents.len()
+        + main_rs_contents.len()
+        + cargo_toml_contents.len()
+        + cargo_lock_contents.len();
+    let compressed_size = 699;
+
+    p.cargo("package")
+        .with_stderr(format!(
+            "\
+[WARNING] manifest has no documentation[..]
+See [..]
+[PACKAGING] foo v0.0.1 ([CWD])
+[VERIFYING] foo v0.0.1 ([CWD])
+[COMPILING] foo v0.0.1 ([CWD][..])
+[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
+[PACKAGED] 4 files, {} B ({} B compressed)
+",
+            uncompressed_size, compressed_size
+        ))
+        .run();
+    assert!(p.root().join("target/package/foo-0.0.1.crate").is_file());
+    p.cargo("package -l")
+        .with_stdout(
+            "\
+Cargo.lock
+Cargo.toml
+Cargo.toml.orig
+src/main.rs
+",
+        )
+        .run();
+    p.cargo("package").with_stdout("").run();
+
+    let f = File::open(&p.root().join("target/package/foo-0.0.1.crate")).unwrap();
+    assert_eq!(f.metadata().unwrap().len(), compressed_size);
+    validate_crate_contents(
+        f,
+        "foo-0.0.1.crate",
+        &["Cargo.lock", "Cargo.toml", "Cargo.toml.orig", "src/main.rs"],
+        &[
+            ("Cargo.lock", cargo_lock_contents),
+            ("Cargo.toml", &cargo_toml_contents),
+            ("Cargo.toml.orig", cargo_toml_orig_contents),
+            ("src/main.rs", main_rs_contents),
+        ],
+    );
+}
+
+#[cargo_test]
+fn larger_filesizes() {
+    let cargo_toml_orig_contents = r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+                license = "MIT"
+                description = "foo"
+            "#;
+    let lots_of_crabs = std::iter::repeat("🦀").take(1337).collect::<String>();
+    let main_rs_contents = format!(r#"fn main() {{ println!("{}"); }}"#, lots_of_crabs);
+    // Relatively uncompressible to increase the compressed package size beyond 1kB.
+    let bar_txt_contents = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
+        tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
+        exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
+        in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
+        sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est
+        laborum.";
+    let cargo_toml_contents = format!(
+        r#"{}
+[package]
+name = "foo"
+version = "0.0.1"
+authors = []
+description = "foo"
+license = "MIT"
+"#,
+        cargo::core::package::MANIFEST_PREAMBLE
+    );
+    let cargo_lock_contents = r#"# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "foo"
+version = "0.0.1"
+"#;
+    let p = project()
+        .file("Cargo.toml", cargo_toml_orig_contents)
+        .file("src/main.rs", &main_rs_contents)
+        .file("src/bar.txt", bar_txt_contents)
+        .build();
+
+    let uncompressed_size = cargo_toml_orig_contents.len()
+        + main_rs_contents.len()
+        + cargo_toml_contents.len()
+        + cargo_lock_contents.len()
+        + bar_txt_contents.len();
+    let compressed_size = 1010;
+
+    p.cargo("package")
+        .with_stderr(format!(
+            "\
+[WARNING] manifest has no documentation[..]
+See [..]
+[PACKAGING] foo v0.0.1 ([CWD])
+[VERIFYING] foo v0.0.1 ([CWD])
+[COMPILING] foo v0.0.1 ([CWD][..])
+[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
+[PACKAGED] 5 files, {} ({} compressed)
+",
+            humansize::format_size(uncompressed_size, humansize::DECIMAL),
+            humansize::format_size(compressed_size, humansize::DECIMAL)
+        ))
+        .run();
+    assert!(p.root().join("target/package/foo-0.0.1.crate").is_file());
+    p.cargo("package -l")
+        .with_stdout(
+            "\
+Cargo.lock
+Cargo.toml
+Cargo.toml.orig
+src/bar.txt
+src/main.rs
+",
+        )
+        .run();
+    p.cargo("package").with_stdout("").run();
+
+    let f = File::open(&p.root().join("target/package/foo-0.0.1.crate")).unwrap();
+    assert_eq!(f.metadata().unwrap().len(), compressed_size);
+    validate_crate_contents(
+        f,
+        "foo-0.0.1.crate",
+        &[
+            "Cargo.lock",
+            "Cargo.toml",
+            "Cargo.toml.orig",
+            "src/bar.txt",
+            "src/main.rs",
+        ],
+        &[
+            ("Cargo.lock", cargo_lock_contents),
+            ("Cargo.toml", &cargo_toml_contents),
+            ("Cargo.toml.orig", cargo_toml_orig_contents),
+            ("src/bar.txt", bar_txt_contents),
+            ("src/main.rs", &main_rs_contents),
+        ],
+    );
+}